Leet Code

Leet Code All problems

#	Problem	Code	Tags
1	Two Sum	Code	[Array, Hash Table]
2	Add Two Numbers	Code	[Linked List, Math]
3	Longest Substring Without Repeating Characters	Code	[Hash Table, Two Pointers, String, Sliding Window]
4	Median of Two Sorted Arrays	Code	[Array, Binary Search, Divide and Conquer]
5	Longest Palindromic Substring	Code	[String, Dynamic Programming]
6	ZigZag Conversion	Code	[String]
7	Reverse Integer	Code	[Math]
8	String to Integer (atoi)	Code	[Math, String]
9	Palindrome Number	Code	[Math]
10	Regular Expression Matching	Code	[String, Dynamic Programming, Backtracking]
11	Container With Most Water	Code	[Array, Two Pointers]
12	Integer to Roman	Code	[Math, String]
13	Roman to Integer	Code	[Math, String]
14	Longest Common Prefix	Code	[String]
15	3Sum	Code	[Array, Two Pointers]
16	3Sum Closest	Code	[Array, Two Pointers]
17	Letter Combinations of a Phone Number	Code	[String, Backtracking, Depth-first Search, Recursion]
18	4Sum	Code	[Array, Hash Table, Two Pointers]
19	Remove Nth Node From End of List	Code	[Linked List, Two Pointers]
20	Valid Parentheses	Code	[String, Stack]
21	Merge Two Sorted Lists	Code	[Linked List]
22	Generate Parentheses	Code	[String, Backtracking]
23	Merge k Sorted Lists	Code	[Linked List, Divide and Conquer, Heap]
24	Swap Nodes in Pairs	Code	[Linked List, Recursion]
25	Reverse Nodes in k-Group	Code	[Linked List]
26	Remove Duplicates from Sorted Array	Code	[Array, Two Pointers]
27	Remove Element	Code	[Array, Two Pointers]
28	Implement strStr()	Code	[Two Pointers, String]
29	Divide Two Integers	Code	[Math, Binary Search]
30	Substring with Concatenation of All Words	Code	[Hash Table, Two Pointers, String]
31	Next Permutation	Code	[Array]
32	Longest Valid Parentheses	Code	[String, Dynamic Programming]
33	Search in Rotated Sorted Array	Code	[Array, Binary Search]
34	Find First and Last Position of Element in Sorted Array	Code	[Array, Binary Search]
35	Search Insert Position	Code	[Array, Binary Search]
36	Valid Sudoku	Code	[Hash Table]
37	Sudoku Solver	Code	[Hash Table, Backtracking]
38	Count and Say	Code	[String]
39	Combination Sum	Code	[Array, Backtracking]
40	Combination Sum II	Code	[Array, Backtracking]
41	First Missing Positive	Code	[Array]
42	Trapping Rain Water	Code	[Array, Two Pointers, Stack]
43	Multiply Strings	Code	[Math, String]
44	Wildcard Matching	Code	[String, Dynamic Programming, Backtracking, Greedy]
45	Jump Game II	Code	[Array, Greedy]
46	Permutations	Code	[Backtracking]
47	Permutations II	Code	[Backtracking]
48	Rotate Image	Code	[Array]
49	Group Anagrams	Code	[Hash Table, String]
50	Pow(x, n)	Code	[Math, Binary Search]
51	N-Queens	Code	[Backtracking]
52	N-Queens II	Code	[Backtracking]
53	Maximum Subarray	Code	[Array, Divide and Conquer, Dynamic Programming]
54	Spiral Matrix	Code	[Array]
55	Jump Game	Code	[Array, Greedy]
56	Merge Intervals	Code	[Array, Sort]
57	Insert Interval	Code	[Array, Sort]
58	Length of Last Word	Code	[String]
59	Spiral Matrix II	Code	[Array]
60	Permutation Sequence	Code	[Math, Backtracking]
61	Rotate List	Code	[Linked List, Two Pointers]
62	Unique Paths	Code	[Array, Dynamic Programming]
63	Unique Paths II	Code	[Array, Dynamic Programming]
64	Minimum Path Sum	Code	[Array, Dynamic Programming]
65	Valid Number	Code	[Math, String]
66	Plus One	Code	[Array]
67	Add Binary	Code	[Math, String]
68	Text Justification	Code	[String]
69	Sqrt(x)	Code	[Math, Binary Search]
70	Climbing Stairs	Code	[Dynamic Programming]
71	Simplify Path	Code	[String, Stack]
72	Edit Distance	Code	[String, Dynamic Programming]
73	Set Matrix Zeroes	Code	[Array]
74	Search a 2D Matrix	Code	[Array, Binary Search]
75	Sort Colors	Code	[Array, Two Pointers, Sort]
76	Minimum Window Substring	Code	[Hash Table, Two Pointers, String, Sliding Window]
77	Combinations	Code	[Backtracking]
78	Subsets	Code	[Array, Backtracking, Bit Manipulation]
79	Word Search	Code	[Array, Backtracking]
80	Remove Duplicates from Sorted Array II	Code	[Array, Two Pointers]
81	Search in Rotated Sorted Array II	Code	[Array, Binary Search]
82	Remove Duplicates from Sorted List II	Code	[Linked List]
83	Remove Duplicates from Sorted List	Code	[Linked List]
84	Largest Rectangle in Histogram	Code	[Array, Stack]
85	Maximal Rectangle	Code	[Array, Hash Table, Dynamic Programming, Stack]
86	Partition List	Code	[Linked List, Two Pointers]
87	Scramble String	Code	[String, Dynamic Programming]
88	Merge Sorted Array	Code	[Array, Two Pointers]
89	Gray Code	Code	[Backtracking]
90	Subsets II	Code	[Array, Backtracking]
91	Decode Ways	Code	[String, Dynamic Programming]
92	Reverse Linked List II	Code	[Linked List]
93	Restore IP Addresses	Code	[String, Backtracking]
94	Binary Tree Inorder Traversal	Code	[Hash Table, Stack, Tree]
95	Unique Binary Search Trees II	Code	[Dynamic Programming, Tree]
96	Unique Binary Search Trees	Code	[Dynamic Programming, Tree]
97	Interleaving String	Code	[String, Dynamic Programming]
98	Validate Binary Search Tree	Code	[Tree, Depth-first Search, Recursion]
99	Recover Binary Search Tree	Code	[Tree, Depth-first Search]
100	Same Tree	Code	[Tree, Depth-first Search]
101	Symmetric Tree	Code	[Tree, Depth-first Search, Breadth-first Search]
102	Binary Tree Level Order Traversal	Code	[Tree, Breadth-first Search]
103	Binary Tree Zigzag Level Order Traversal	Code	[Stack, Tree, Breadth-first Search]
104	Maximum Depth of Binary Tree	Code	[Tree, Depth-first Search, Recursion]
105	Construct Binary Tree from Preorder and Inorder Traversal	Code	[Array, Tree, Depth-first Search]
106	Construct Binary Tree from Inorder and Postorder Traversal	Code	[Array, Tree, Depth-first Search]
107	Binary Tree Level Order Traversal II	Code	[Tree, Breadth-first Search]
108	Convert Sorted Array to Binary Search Tree	Code	[Tree, Depth-first Search]
109	Convert Sorted List to Binary Search Tree	Code	[Linked List, Depth-first Search]
110	Balanced Binary Tree	Code	[Tree, Depth-first Search, Recursion]
111	Minimum Depth of Binary Tree	Code	[Tree, Depth-first Search, Breadth-first Search]
112	Path Sum	Code	[Tree, Depth-first Search]
113	Path Sum II	Code	[Tree, Depth-first Search]
114	Flatten Binary Tree to Linked List	Code	[Tree, Depth-first Search]
115	Distinct Subsequences	Code	[String, Dynamic Programming]
116	Populating Next Right Pointers in Each Node	Code	[Tree, Depth-first Search, Breadth-first Search]
117	Populating Next Right Pointers in Each Node II	Code	[Tree, Depth-first Search]
118	Pascal’s Triangle	Code	[Array]
119	Pascal’s Triangle II	Code	[Array]
120	Triangle	Code	[Array, Dynamic Programming]
121	Best Time to Buy and Sell Stock	Code	[Array, Dynamic Programming]
122	Best Time to Buy and Sell Stock II	Code	[Array, Greedy]
123	Best Time to Buy and Sell Stock III	Code	[Array, Dynamic Programming]
124	Binary Tree Maximum Path Sum	Code	[Tree, Depth-first Search, Recursion]
125	Valid Palindrome	Code	[Two Pointers, String]
126	Word Ladder II	Code	[Array, String, Backtracking, Breadth-first Search]
127	Word Ladder	Code	[Breadth-first Search]
128	Longest Consecutive Sequence	Code	[Array, Union Find]
129	Sum Root to Leaf Numbers	Code	[Tree, Depth-first Search]
130	Surrounded Regions	Code	[Depth-first Search, Breadth-first Search, Union Find]
131	Palindrome Partitioning	Code	[Dynamic Programming, Backtracking, Depth-first Search]
132	Palindrome Partitioning II	Code	[Dynamic Programming]
133	Clone Graph	Code	[Depth-first Search, Breadth-first Search, Graph]
134	Gas Station	Code	[Greedy]
135	Candy	Code	[Greedy]
136	Single Number	Code	[Hash Table, Bit Manipulation]
137	Single Number II	Code	[Bit Manipulation]
138	Copy List with Random Pointer	Code	[Hash Table, Linked List]
139	Word Break	Code	[Dynamic Programming]
140	Word Break II	Code	[Dynamic Programming, Backtracking]
141	Linked List Cycle	Code	[Linked List, Two Pointers]
142	Linked List Cycle II	Code	[Linked List, Two Pointers]
143	Reorder List	Code	[Linked List]
144	Binary Tree Preorder Traversal	Code	[Stack, Tree]
145	Binary Tree Postorder Traversal	Code	[Stack, Tree]
146	LRU Cache	Code	[Design]
147	Insertion Sort List	Code	[Linked List, Sort]
148	Sort List	Code	[Linked List, Sort]
149	Max Points on a Line	Code	[Hash Table, Math]
150	Evaluate Reverse Polish Notation	Code	[Stack]
151	Reverse Words in a String	Code	[String]
152	Maximum Product Subarray	Code	[Array, Dynamic Programming]
153	Find Minimum in Rotated Sorted Array	Code	[Array, Binary Search]
154	Find Minimum in Rotated Sorted Array II	Code	[Array, Binary Search]
155	Min Stack	Code	[Stack, Design]
156	Binary Tree Upside Down	Code	[Tree]
157	Read N Characters Given Read4	Code	[String]
158	Read N Characters Given Read4 II - Call multiple times	Code	[String]
159	Longest Substring with At Most Two Distinct Characters	Code	[Hash Table, Two Pointers, String, Sliding Window]
160	Intersection of Two Linked Lists	Code	[Linked List]
161	One Edit Distance	Code	[String]
162	Find Peak Element	Code	[Array, Binary Search]
163	Missing Ranges	Code	[Array]
164	Maximum Gap	Code	[Sort]
165	Compare Version Numbers	Code	[String]
166	Fraction to Recurring Decimal	Code	[Hash Table, Math]
167	Two Sum II - Input array is sorted	Code	[Array, Two Pointers, Binary Search]
168	Excel Sheet Column Title	Code	[Math]
169	Majority Element	Code	[Array, Divide and Conquer, Bit Manipulation]
170	Two Sum III - Data structure design	Code	[Hash Table, Design]
171	Excel Sheet Column Number	Code	[Math]
172	Factorial Trailing Zeroes	Code	[Math]
173	Binary Search Tree Iterator	Code	[Stack, Tree, Design]
174	Dungeon Game	Code	[Binary Search, Dynamic Programming]
175	Combine Two Tables	Code
176	Second Highest Salary	Code
177	Nth Highest Salary	Code
178	Rank Scores	Code
179	Largest Number	Code	[Sort]
180	Consecutive Numbers	Code
181	Employees Earning More Than Their Managers	Code
182	Duplicate Emails	Code
183	Customers Who Never Order	Code
184	Department Highest Salary	Code
185	Department Top Three Salaries	Code
186	Reverse Words in a String II	Code	[String]
187	Repeated DNA Sequences	Code	[Hash Table, Bit Manipulation]
188	Best Time to Buy and Sell Stock IV	Code	[Dynamic Programming]
189	Rotate Array	Code	[Array]
190	Reverse Bits	Code	[Bit Manipulation]
191	Number of 1 Bits	Code	[Bit Manipulation]
192	Word Frequency	Code
193	Valid Phone Numbers	Code
194	Transpose File	Code
195	Tenth Line	Code
196	Delete Duplicate Emails	Code
197	Rising Temperature	Code
198	House Robber	Code	[Dynamic Programming]
199	Binary Tree Right Side View	Code	[Tree, Depth-first Search, Breadth-first Search]
200	Number of Islands	Code	[Depth-first Search, Breadth-first Search, Union Find]
201	Bitwise AND of Numbers Range	Code	[Bit Manipulation]
202	Happy Number	Code	[Hash Table, Math]
203	Remove Linked List Elements	Code	[Linked List]
204	Count Primes	Code	[Hash Table, Math]
205	Isomorphic Strings	Code	[Hash Table]
206	Reverse Linked List	Code	[Linked List]
207	Course Schedule	Code	[Depth-first Search, Breadth-first Search, Graph, Topological Sort]
208	Implement Trie (Prefix Tree)	Code	[Design, Trie]
209	Minimum Size Subarray Sum	Code	[Array, Two Pointers, Binary Search]
210	Course Schedule II	Code	[Depth-first Search, Breadth-first Search, Graph, Topological Sort]
211	Design Add and Search Words Data Structure	Code	[Backtracking, Depth-first Search, Design, Trie]
212	Word Search II	Code	[Backtracking, Trie]
213	House Robber II	Code	[Dynamic Programming]
214	Shortest Palindrome	Code	[String]
215	Kth Largest Element in an Array	Code	[Divide and Conquer, Heap]
216	Combination Sum III	Code	[Array, Backtracking]
217	Contains Duplicate	Code	[Array, Hash Table]
218	The Skyline Problem	Code	[Divide and Conquer, Heap, Binary Indexed Tree, Segment Tree, Line Sweep]
219	Contains Duplicate II	Code	[Array, Hash Table]
220	Contains Duplicate III	Code	[Sort, Ordered Map]
221	Maximal Square	Code	[Dynamic Programming]
222	Count Complete Tree Nodes	Code	[Binary Search, Tree]
223	Rectangle Area	Code	[Math]
224	Basic Calculator	Code	[Math, Stack]
225	Implement Stack using Queues	Code	[Stack, Design]
226	Invert Binary Tree	Code	[Tree]
227	Basic Calculator II	Code	[String, Stack]
228	Summary Ranges	Code	[Array]
229	Majority Element II	Code	[Array]
230	Kth Smallest Element in a BST	Code	[Binary Search, Tree]
231	Power of Two	Code	[Math, Bit Manipulation]
232	Implement Queue using Stacks	Code	[Stack, Design]
233	Number of Digit One	Code	[Math]
234	Palindrome Linked List	Code	[Linked List, Two Pointers]
235	Lowest Common Ancestor of a Binary Search Tree	Code	[Tree]
236	Lowest Common Ancestor of a Binary Tree	Code	[Tree]
237	Delete Node in a Linked List	Code	[Linked List]
238	Product of Array Except Self	Code	[Array]
239	Sliding Window Maximum	Code	[Heap, Sliding Window, Dequeue]
240	Search a 2D Matrix II	Code	[Binary Search, Divide and Conquer]
241	Different Ways to Add Parentheses	Code	[Divide and Conquer]
242	Valid Anagram	Code	[Hash Table, Sort]
243	Shortest Word Distance	Code	[Array]
244	Shortest Word Distance II	Code	[Hash Table, Design]
245	Shortest Word Distance III	Code	[Array]
246	Strobogrammatic Number	Code	[Hash Table, Math]
247	Strobogrammatic Number II	Code	[Math, Recursion]
248	Strobogrammatic Number III	Code	[Math, Recursion]
249	Group Shifted Strings	Code	[Hash Table, String]
250	Count Univalue Subtrees	Code	[Tree]
251	Flatten 2D Vector	Code	[Design]
252	Meeting Rooms	Code	[Sort]
253	Meeting Rooms II	Code	[Heap, Greedy, Sort]
254	Factor Combinations	Code	[Backtracking]
255	Verify Preorder Sequence in Binary Search Tree	Code	[Stack, Tree]
256	Paint House	Code	[Dynamic Programming]
257	Binary Tree Paths	Code	[Tree, Depth-first Search]
258	Add Digits	Code	[Math]
259	3Sum Smaller	Code	[Array, Two Pointers]
260	Single Number III	Code	[Bit Manipulation]
261	Graph Valid Tree	Code	[Depth-first Search, Breadth-first Search, Union Find, Graph]
262	Trips and Users	Code
263	Ugly Number	Code	[Math]
264	Ugly Number II	Code	[Math, Dynamic Programming, Heap]
265	Paint House II	Code	[Dynamic Programming]
266	Palindrome Permutation	Code	[Hash Table]
267	Palindrome Permutation II	Code	[Backtracking]
268	Missing Number	Code	[Array, Math, Bit Manipulation]
269	Alien Dictionary	Code	[Graph, Topological Sort]
270	Closest Binary Search Tree Value	Code	[Binary Search, Tree]
271	Encode and Decode Strings	Code	[String]
272	Closest Binary Search Tree Value II	Code	[Stack, Tree]
273	Integer to English Words	Code	[Math, String]
274	H-Index	Code	[Hash Table, Sort]
275	H-Index II	Code	[Binary Search]
276	Paint Fence	Code	[Dynamic Programming]
277	Find the Celebrity	Code	[Array]
278	First Bad Version	Code	[Binary Search]
279	Perfect Squares	Code	[Math, Dynamic Programming, Breadth-first Search]
280	Wiggle Sort	Code	[Array, Sort]
281	Zigzag Iterator	Code	[Design]
282	Expression Add Operators	Code	[Divide and Conquer]
283	Move Zeroes	Code	[Array, Two Pointers]
284	Peeking Iterator	Code	[Design]
285	Inorder Successor in BST	Code	[Tree]
286	Walls and Gates	Code	[Breadth-first Search]
287	Find the Duplicate Number	Code	[Array, Two Pointers, Binary Search]
288	Unique Word Abbreviation	Code	[Hash Table, Design]
289	Game of Life	Code	[Array]
290	Word Pattern	Code	[Hash Table]
291	Word Pattern II	Code	[Backtracking]
292	Nim Game	Code	[Brainteaser, Minimax]
293	Flip Game	Code	[String]
294	Flip Game II	Code	[Backtracking, Minimax]
295	Find Median from Data Stream	Code	[Heap, Design]
296	Best Meeting Point	Code	[Math, Sort]
297	Serialize and Deserialize Binary Tree	Code	[Tree, Design]
298	Binary Tree Longest Consecutive Sequence	Code	[Tree]
299	Bulls and Cows	Code	[Hash Table]
300	Longest Increasing Subsequence	Code	[Binary Search, Dynamic Programming]
301	Remove Invalid Parentheses	Code	[Depth-first Search, Breadth-first Search]
302	Smallest Rectangle Enclosing Black Pixels	Code	[Binary Search]
303	Range Sum Query - Immutable	Code	[Dynamic Programming]
304	Range Sum Query 2D - Immutable	Code	[Dynamic Programming]
305	Number of Islands II	Code	[Union Find]
306	Additive Number	Code	[Backtracking]
307	Range Sum Query - Mutable	Code	[Binary Indexed Tree, Segment Tree]
308	Range Sum Query 2D - Mutable	Code	[Binary Indexed Tree, Segment Tree]
309	Best Time to Buy and Sell Stock with Cooldown	Code	[Dynamic Programming]
310	Minimum Height Trees	Code	[Breadth-first Search, Graph]
311	Sparse Matrix Multiplication	Code	[Hash Table]
312	Burst Balloons	Code	[Divide and Conquer, Dynamic Programming]
313	Super Ugly Number	Code	[Math, Heap]
314	Binary Tree Vertical Order Traversal	Code	[Depth-first Search, Breadth-first Search]
315	Count of Smaller Numbers After Self	Code	[Binary Search, Divide and Conquer, Sort, Binary Indexed Tree, Segment Tree]
316	Remove Duplicate Letters	Code	[String, Stack, Greedy]
317	Shortest Distance from All Buildings	Code	[Breadth-first Search]
318	Maximum Product of Word Lengths	Code	[Bit Manipulation]
319	Bulb Switcher	Code	[Math, Brainteaser]
320	Generalized Abbreviation	Code	[Backtracking, Bit Manipulation]
321	Create Maximum Number	Code	[Dynamic Programming, Greedy]
322	Coin Change	Code	[Dynamic Programming]
323	Number of Connected Components in an Undirected Graph	Code	[Depth-first Search, Breadth-first Search, Union Find, Graph]
324	Wiggle Sort II	Code	[Sort]
325	Maximum Size Subarray Sum Equals k	Code	[Hash Table]
326	Power of Three	Code	[Math]
327	Count of Range Sum	Code	[Binary Search, Divide and Conquer, Sort, Binary Indexed Tree, Segment Tree]
328	Odd Even Linked List	Code	[Linked List]
329	Longest Increasing Path in a Matrix	Code	[Depth-first Search, Topological Sort, Memoization]
330	Patching Array	Code	[Greedy]
331	Verify Preorder Serialization of a Binary Tree	Code	[Stack]
332	Reconstruct Itinerary	Code	[Depth-first Search, Graph]
333	Largest BST Subtree	Code	[Tree]
334	Increasing Triplet Subsequence	Code
335	Self Crossing	Code	[Math]
336	Palindrome Pairs	Code	[Hash Table, String, Trie]
337	House Robber III	Code	[Dynamic Programming, Tree, Depth-first Search]
338	Counting Bits	Code	[Dynamic Programming, Bit Manipulation]
339	Nested List Weight Sum	Code	[Depth-first Search]
340	Longest Substring with At Most K Distinct Characters	Code	[Hash Table, Two Pointers, String, Sliding Window]
341	Flatten Nested List Iterator	Code	[Stack, Design]
342	Power of Four	Code	[Bit Manipulation]
343	Integer Break	Code	[Math, Dynamic Programming]
344	Reverse String	Code	[Two Pointers, String]
345	Reverse Vowels of a String	Code	[Two Pointers, String]
346	Moving Average from Data Stream	Code	[Design, Queue]
347	Top K Frequent Elements	Code	[Hash Table, Heap]
348	Design Tic-Tac-Toe	Code	[Design]
349	Intersection of Two Arrays	Code	[Hash Table, Two Pointers, Binary Search, Sort]
350	Intersection of Two Arrays II	Code	[Hash Table, Two Pointers, Binary Search, Sort]
351	Android Unlock Patterns	Code	[Dynamic Programming, Backtracking]
352	Data Stream as Disjoint Intervals	Code	[Binary Search, Ordered Map]
353	Design Snake Game	Code	[Design, Queue]
354	Russian Doll Envelopes	Code	[Binary Search, Dynamic Programming]
355	Design Twitter	Code	[Hash Table, Heap, Design]
356	Line Reflection	Code	[Hash Table, Math]
357	Count Numbers with Unique Digits	Code	[Math, Dynamic Programming, Backtracking]
358	Rearrange String k Distance Apart	Code	[Hash Table, Heap, Greedy]
359	Logger Rate Limiter	Code	[Hash Table, Design]
360	Sort Transformed Array	Code	[Math, Two Pointers, Sort]
361	Bomb Enemy	Code	[Dynamic Programming]
362	Design Hit Counter	Code	[Design]
363	Max Sum of Rectangle No Larger Than K	Code	[Binary Search, Dynamic Programming, Queue]
364	Nested List Weight Sum II	Code	[Depth-first Search]
365	Water and Jug Problem	Code	[Math]
366	Find Leaves of Binary Tree	Code	[Tree, Depth-first Search]
367	Valid Perfect Square	Code	[Math, Binary Search]
368	Largest Divisible Subset	Code	[Math, Dynamic Programming]
369	Plus One Linked List	Code	[Linked List, Recursion]
370	Range Addition	Code	[Array]
371	Sum of Two Integers	Code	[Bit Manipulation]
372	Super Pow	Code	[Math]
373	Find K Pairs with Smallest Sums	Code	[Heap]
374	Guess Number Higher or Lower	Code	[Binary Search]
375	Guess Number Higher or Lower II	Code	[Dynamic Programming, Minimax]
376	Wiggle Subsequence	Code	[Dynamic Programming, Greedy]
377	Combination Sum IV	Code	[Dynamic Programming]
378	Kth Smallest Element in a Sorted Matrix	Code	[Binary Search, Heap]
379	Design Phone Directory	Code	[Linked List, Design]
380	Insert Delete GetRandom O(1)	Code	[Array, Hash Table, Design]
381	Insert Delete GetRandom O(1) - Duplicates allowed	Code	[Array, Hash Table, Design]
382	Linked List Random Node	Code	[Reservoir Sampling]
383	Ransom Note	Code	[String]
384	Shuffle an Array	Code
385	Mini Parser	Code	[String, Stack]
386	Lexicographical Numbers	Code
387	First Unique Character in a String	Code	[Hash Table, String]
388	Longest Absolute File Path	Code
389	Find the Difference	Code	[Hash Table, Bit Manipulation]
390	Elimination Game	Code
391	Perfect Rectangle	Code	[Line Sweep]
392	Is Subsequence	Code	[Binary Search, Dynamic Programming, Greedy]
393	UTF-8 Validation	Code	[Bit Manipulation]
394	Decode String	Code	[Stack, Depth-first Search]
395	Longest Substring with At Least K Repeating Characters	Code	[Divide and Conquer, Recursion, Sliding Window]
396	Rotate Function	Code	[Math]
397	Integer Replacement	Code	[Math, Bit Manipulation]
398	Random Pick Index	Code	[Reservoir Sampling]
399	Evaluate Division	Code	[Union Find, Graph]
400	Nth Digit	Code	[Math]
401	Binary Watch	Code	[Backtracking, Bit Manipulation]
402	Remove K Digits	Code	[Stack, Greedy]
403	Frog Jump	Code	[Dynamic Programming]
404	Sum of Left Leaves	Code	[Tree]
405	Convert a Number to Hexadecimal	Code	[Bit Manipulation]
406	Queue Reconstruction by Height	Code	[Greedy]
407	Trapping Rain Water II	Code	[Heap, Breadth-first Search]
408	Valid Word Abbreviation	Code	[String]
409	Longest Palindrome	Code	[Hash Table]
410	Split Array Largest Sum	Code	[Binary Search, Dynamic Programming]
411	Minimum Unique Word Abbreviation	Code	[Backtracking, Bit Manipulation]
412	Fizz Buzz	Code
413	Arithmetic Slices	Code	[Math, Dynamic Programming]
414	Third Maximum Number	Code	[Array]
415	Add Strings	Code	[String]
416	Partition Equal Subset Sum	Code	[Dynamic Programming]
417	Pacific Atlantic Water Flow	Code	[Depth-first Search, Breadth-first Search]
418	Sentence Screen Fitting	Code	[Dynamic Programming]
419	Battleships in a Board	Code
420	Strong Password Checker	Code
421	Maximum XOR of Two Numbers in an Array	Code	[Bit Manipulation, Trie]
422	Valid Word Square	Code
423	Reconstruct Original Digits from English	Code	[Math]
424	Longest Repeating Character Replacement	Code	[Two Pointers, Sliding Window]
425	Word Squares	Code	[Backtracking, Trie]
426	Convert Binary Search Tree to Sorted Doubly Linked List	Code	[Linked List, Divide and Conquer, Tree]
427	Construct Quad Tree	Code
428	Serialize and Deserialize N-ary Tree	Code	[Tree]
429	N-ary Tree Level Order Traversal	Code	[Tree, Breadth-first Search]
430	Flatten a Multilevel Doubly Linked List	Code	[Linked List, Depth-first Search]
431	Encode N-ary Tree to Binary Tree	Code	[Tree]
432	All Oone Data Structure	Code	[Design]
433	Minimum Genetic Mutation	Code
434	Number of Segments in a String	Code	[String]
435	Non-overlapping Intervals	Code	[Greedy]
436	Find Right Interval	Code	[Binary Search]
437	Path Sum III	Code	[Tree]
438	Find All Anagrams in a String	Code	[Hash Table]
439	Ternary Expression Parser	Code	[Stack, Depth-first Search]
440	K-th Smallest in Lexicographical Order	Code
441	Arranging Coins	Code	[Math, Binary Search]
442	Find All Duplicates in an Array	Code	[Array]
443	String Compression	Code	[String]
444	Sequence Reconstruction	Code	[Graph, Topological Sort]
445	Add Two Numbers II	Code	[Linked List]
446	Arithmetic Slices II - Subsequence	Code	[Dynamic Programming]
447	Number of Boomerangs	Code	[Hash Table, Math]
448	Find All Numbers Disappeared in an Array	Code	[Array]
449	Serialize and Deserialize BST	Code	[Tree]
450	Delete Node in a BST	Code	[Tree]
451	Sort Characters By Frequency	Code	[Hash Table, Heap]
452	Minimum Number of Arrows to Burst Balloons	Code	[Greedy, Sort]
453	Minimum Moves to Equal Array Elements	Code	[Math]
454	4Sum II	Code	[Hash Table, Binary Search]
455	Assign Cookies	Code	[Greedy]
456	132 Pattern	Code	[Stack]
457	Circular Array Loop	Code	[Array, Two Pointers]
458	Poor Pigs	Code	[Math]
459	Repeated Substring Pattern	Code	[String]
460	LFU Cache	Code	[Design]
461	Hamming Distance	Code	[Bit Manipulation]
462	Minimum Moves to Equal Array Elements II	Code	[Math]
463	Island Perimeter	Code	[Hash Table]
464	Can I Win	Code	[Dynamic Programming, Minimax]
465	Optimal Account Balancing	Code
466	Count The Repetitions	Code	[Dynamic Programming]
467	Unique Substrings in Wraparound String	Code	[Dynamic Programming]
468	Validate IP Address	Code	[String]
469	Convex Polygon	Code	[Math]
470	Implement Rand10() Using Rand7()	Code	[Random, Rejection Sampling]
471	Encode String with Shortest Length	Code	[Dynamic Programming]
472	Concatenated Words	Code	[Dynamic Programming, Depth-first Search, Trie]
473	Matchsticks to Square	Code	[Depth-first Search]
474	Ones and Zeroes	Code	[Dynamic Programming]
475	Heaters	Code	[Binary Search]
476	Number Complement	Code	[Bit Manipulation]
477	Total Hamming Distance	Code	[Bit Manipulation]
478	Generate Random Point in a Circle	Code	[Math, Random, Rejection Sampling]
479	Largest Palindrome Product	Code
480	Sliding Window Median	Code	[Sliding Window]
481	Magical String	Code
482	License Key Formatting	Code
483	Smallest Good Base	Code	[Math, Binary Search]
484	Find Permutation	Code	[Greedy]
485	Max Consecutive Ones	Code	[Array]
486	Predict the Winner	Code	[Dynamic Programming, Minimax]
487	Max Consecutive Ones II	Code	[Two Pointers]
488	Zuma Game	Code	[Depth-first Search]
489	Robot Room Cleaner	Code	[Depth-first Search]
490	The Maze	Code	[Depth-first Search, Breadth-first Search]
491	Increasing Subsequences	Code	[Depth-first Search]
492	Construct the Rectangle	Code	[Math]
493	Reverse Pairs	Code	[Binary Search, Divide and Conquer, Sort, Binary Indexed Tree, Segment Tree]
494	Target Sum	Code	[Dynamic Programming, Depth-first Search]
495	Teemo Attacking	Code	[Array]
496	Next Greater Element I	Code	[Stack]
497	Random Point in Non-overlapping Rectangles	Code	[Binary Search, Random]
498	Diagonal Traverse	Code
499	The Maze III	Code	[Depth-first Search, Breadth-first Search]
500	Keyboard Row	Code	[Hash Table]
501	Find Mode in Binary Search Tree	Code	[Tree]
502	IPO	Code	[Heap, Greedy]
503	Next Greater Element II	Code	[Stack]
504	Base 7	Code
505	The Maze II	Code	[Depth-first Search, Breadth-first Search]
506	Relative Ranks	Code
507	Perfect Number	Code	[Math]
508	Most Frequent Subtree Sum	Code	[Hash Table, Tree]
509	Fibonacci Number	Code	[Array]
510	Inorder Successor in BST II	Code	[Tree]
511	Game Play Analysis I	Code
512	Game Play Analysis II	Code
513	Find Bottom Left Tree Value	Code	[Tree, Depth-first Search, Breadth-first Search]
514	Freedom Trail	Code	[Divide and Conquer, Dynamic Programming, Depth-first Search]
515	Find Largest Value in Each Tree Row	Code	[Tree, Depth-first Search, Breadth-first Search]
516	Longest Palindromic Subsequence	Code	[Dynamic Programming]
517	Super Washing Machines	Code	[Math, Dynamic Programming]
518	Coin Change 2	Code
519	Random Flip Matrix	Code	[Random]
520	Detect Capital	Code	[String]
521	Longest Uncommon Subsequence I	Code	[String, Brainteaser]
522	Longest Uncommon Subsequence II	Code	[String]
523	Continuous Subarray Sum	Code	[Math, Dynamic Programming]
524	Longest Word in Dictionary through Deleting	Code	[Two Pointers, Sort]
525	Contiguous Array	Code	[Hash Table]
526	Beautiful Arrangement	Code	[Backtracking]
527	Word Abbreviation	Code	[String, Sort]
528	Random Pick with Weight	Code	[Binary Search, Random]
529	Minesweeper	Code	[Depth-first Search, Breadth-first Search]
530	Minimum Absolute Difference in BST	Code	[Tree]
531	Lonely Pixel I	Code	[Array, Depth-first Search]
532	K-diff Pairs in an Array	Code	[Array, Two Pointers]
533	Lonely Pixel II	Code	[Array]
534	Game Play Analysis III	Code
535	Encode and Decode TinyURL	Code	[Hash Table, Math]
536	Construct Binary Tree from String	Code	[String, Tree]
537	Complex Number Multiplication	Code	[Math, String]
538	Convert BST to Greater Tree	Code	[Tree]
539	Minimum Time Difference	Code	[String]
540	Single Element in a Sorted Array	Code	[Binary Search]
541	Reverse String II	Code	[String]
542	01 Matrix	Code	[Depth-first Search, Breadth-first Search]
543	Diameter of Binary Tree	Code	[Tree]
544	Output Contest Matches	Code	[String, Recursion]
545	Boundary of Binary Tree	Code	[Tree]
546	Remove Boxes	Code	[Dynamic Programming, Depth-first Search]
547	Number of Provinces	Code	[Depth-first Search, Union Find]
548	Split Array with Equal Sum	Code	[Array]
549	Binary Tree Longest Consecutive Sequence II	Code	[Tree]
550	Game Play Analysis IV	Code
551	Student Attendance Record I	Code	[String]
552	Student Attendance Record II	Code	[Dynamic Programming]
553	Optimal Division	Code	[Math, String]
554	Brick Wall	Code	[Hash Table]
555	Split Concatenated Strings	Code	[String]
556	Next Greater Element III	Code	[String]
557	Reverse Words in a String III	Code	[String]
558	Logical OR of Two Binary Grids Represented as Quad-Trees	Code
559	Maximum Depth of N-ary Tree	Code	[Tree, Depth-first Search, Breadth-first Search]
560	Subarray Sum Equals K	Code	[Array, Hash Table]
561	Array Partition I	Code	[Array]
562	Longest Line of Consecutive One in Matrix	Code	[Array]
563	Binary Tree Tilt	Code	[Tree, Depth-first Search, Recursion]
564	Find the Closest Palindrome	Code	[String]
565	Array Nesting	Code	[Array]
566	Reshape the Matrix	Code	[Array]
567	Permutation in String	Code	[Two Pointers, Sliding Window]
568	Maximum Vacation Days	Code	[Dynamic Programming]
569	Median Employee Salary	Code
570	Managers with at Least 5 Direct Reports	Code
571	Find Median Given Frequency of Numbers	Code
572	Subtree of Another Tree	Code	[Tree]
573	Squirrel Simulation	Code	[Math]
574	Winning Candidate	Code
575	Distribute Candies	Code	[Hash Table]
576	Out of Boundary Paths	Code	[Dynamic Programming, Depth-first Search]
577	Employee Bonus	Code
578	Get Highest Answer Rate Question	Code
579	Find Cumulative Salary of an Employee	Code
580	Count Student Number in Departments	Code
581	Shortest Unsorted Continuous Subarray	Code	[Array]
582	Kill Process	Code	[Tree, Queue]
583	Delete Operation for Two Strings	Code	[String]
584	Find Customer Referee	Code
585	Investments in 2016	Code
586	Customer Placing the Largest Number of Orders	Code
587	Erect the Fence	Code	[Geometry]
588	Design In-Memory File System	Code	[Design]
589	N-ary Tree Preorder Traversal	Code	[Tree]
590	N-ary Tree Postorder Traversal	Code	[Tree]
591	Tag Validator	Code	[String, Stack]
592	Fraction Addition and Subtraction	Code	[Math]
593	Valid Square	Code	[Math]
594	Longest Harmonious Subsequence	Code	[Hash Table]
595	Big Countries	Code
596	Classes More Than 5 Students	Code
597	Friend Requests I: Overall Acceptance Rate	Code
598	Range Addition II	Code	[Math]
599	Minimum Index Sum of Two Lists	Code	[Hash Table]
600	Non-negative Integers without Consecutive Ones	Code	[Dynamic Programming]
601	Human Traffic of Stadium	Code
602	Friend Requests II: Who Has the Most Friends	Code
603	Consecutive Available Seats	Code
604	Design Compressed String Iterator	Code	[Design]
605	Can Place Flowers	Code	[Array, Greedy]
606	Construct String from Binary Tree	Code	[String, Tree]
607	Sales Person	Code
608	Tree Node	Code
609	Find Duplicate File in System	Code	[Hash Table, String]
610	Triangle Judgement	Code
611	Valid Triangle Number	Code	[Array]
612	Shortest Distance in a Plane	Code
613	Shortest Distance in a Line	Code
614	Second Degree Follower	Code
615	Average Salary: Departments VS Company	Code
616	Add Bold Tag in String	Code	[String]
617	Merge Two Binary Trees	Code	[Tree]
618	Students Report By Geography	Code
619	Biggest Single Number	Code
620	Not Boring Movies	Code
621	Task Scheduler	Code	[Array, Greedy, Queue]
622	Design Circular Queue	Code	[Design, Queue]
623	Add One Row to Tree	Code	[Tree]
624	Maximum Distance in Arrays	Code	[Array, Hash Table]
625	Minimum Factorization	Code	[Math, Recursion]
626	Exchange Seats	Code
627	Swap Salary	Code
628	Maximum Product of Three Numbers	Code	[Array, Math]
629	K Inverse Pairs Array	Code	[Dynamic Programming]
630	Course Schedule III	Code	[Greedy]
631	Design Excel Sum Formula	Code	[Design]
632	Smallest Range Covering Elements from K Lists	Code	[Hash Table, Two Pointers, String]
633	Sum of Square Numbers	Code	[Math]
634	Find the Derangement of An Array	Code	[Math]
635	Design Log Storage System	Code	[String, Design]
636	Exclusive Time of Functions	Code	[Stack]
637	Average of Levels in Binary Tree	Code	[Tree]
638	Shopping Offers	Code	[Dynamic Programming, Depth-first Search]
639	Decode Ways II	Code	[Dynamic Programming]
640	Solve the Equation	Code	[Math]
641	Design Circular Deque	Code	[Design, Queue]
642	Design Search Autocomplete System	Code	[Design, Trie]
643	Maximum Average Subarray I	Code	[Array]
644	Maximum Average Subarray II	Code	[Array, Binary Search]
645	Set Mismatch	Code	[Hash Table, Math]
646	Maximum Length of Pair Chain	Code	[Dynamic Programming]
647	Palindromic Substrings	Code	[String, Dynamic Programming]
648	Replace Words	Code	[Hash Table, Trie]
649	Dota2 Senate	Code	[Greedy]
650	2 Keys Keyboard	Code	[Dynamic Programming]
651	4 Keys Keyboard	Code	[Math, Dynamic Programming, Greedy]
652	Find Duplicate Subtrees	Code	[Tree]
653	Two Sum IV - Input is a BST	Code	[Tree]
654	Maximum Binary Tree	Code	[Tree]
655	Print Binary Tree	Code	[Tree]
656	Coin Path	Code	[Dynamic Programming]
657	Robot Return to Origin	Code	[String]
658	Find K Closest Elements	Code	[Binary Search]
659	Split Array into Consecutive Subsequences	Code	[Heap, Greedy]
660	Remove 9	Code	[Math]
661	Image Smoother	Code	[Array]
662	Maximum Width of Binary Tree	Code	[Tree]
663	Equal Tree Partition	Code	[Tree]
664	Strange Printer	Code	[Dynamic Programming, Depth-first Search]
665	Non-decreasing Array	Code	[Array]
666	Path Sum IV	Code	[Tree]
667	Beautiful Arrangement II	Code	[Array]
668	Kth Smallest Number in Multiplication Table	Code	[Binary Search]
669	Trim a Binary Search Tree	Code	[Tree]
670	Maximum Swap	Code	[Array, Math]
671	Second Minimum Node In a Binary Tree	Code	[Tree]
672	Bulb Switcher II	Code	[Math]
673	Number of Longest Increasing Subsequence	Code	[Dynamic Programming]
674	Longest Continuous Increasing Subsequence	Code	[Array]
675	Cut Off Trees for Golf Event	Code	[Breadth-first Search]
676	Implement Magic Dictionary	Code	[Hash Table, Trie]
677	Map Sum Pairs	Code	[Trie]
678	Valid Parenthesis String	Code	[String]
679	24 Game	Code	[Depth-first Search]
680	Valid Palindrome II	Code	[String]
681	Next Closest Time	Code	[String]
682	Baseball Game	Code	[Stack]
683	K Empty Slots	Code	[Ordered Map]
684	Redundant Connection	Code	[Tree, Union Find, Graph]
685	Redundant Connection II	Code	[Tree, Depth-first Search, Union Find, Graph]
686	Repeated String Match	Code	[String]
687	Longest Univalue Path	Code	[Tree, Recursion]
688	Knight Probability in Chessboard	Code	[Dynamic Programming]
689	Maximum Sum of 3 Non-Overlapping Subarrays	Code	[Array, Dynamic Programming]
690	Employee Importance	Code	[Hash Table, Depth-first Search, Breadth-first Search]
691	Stickers to Spell Word	Code	[Dynamic Programming, Backtracking]
692	Top K Frequent Words	Code	[Hash Table, Heap, Trie]
693	Binary Number with Alternating Bits	Code	[Bit Manipulation]
694	Number of Distinct Islands	Code	[Hash Table, Depth-first Search]
695	Max Area of Island	Code	[Array, Depth-first Search]
696	Count Binary Substrings	Code	[String]
697	Degree of an Array	Code	[Array]
698	Partition to K Equal Sum Subsets	Code	[Dynamic Programming, Recursion]
699	Falling Squares	Code	[Segment Tree, Ordered Map]
700	Search in a Binary Search Tree	Code	[Tree]
701	Insert into a Binary Search Tree	Code	[Tree]
702	Search in a Sorted Array of Unknown Size	Code	[Binary Search]
703	Kth Largest Element in a Stream	Code	[Heap, Design]
704	Binary Search	Code	[Binary Search]
705	Design HashSet	Code	[Hash Table, Design]
706	Design HashMap	Code	[Hash Table, Design]
707	Design Linked List	Code	[Linked List, Design]
708	Insert into a Sorted Circular Linked List	Code	[Linked List]
709	To Lower Case	Code	[String]
710	Random Pick with Blacklist	Code	[Hash Table, Binary Search, Sort, Random]
711	Number of Distinct Islands II	Code	[Hash Table, Depth-first Search]
712	Minimum ASCII Delete Sum for Two Strings	Code	[Dynamic Programming]
713	Subarray Product Less Than K	Code	[Array, Two Pointers]
714	Best Time to Buy and Sell Stock with Transaction Fee	Code	[Array, Dynamic Programming, Greedy]
715	Range Module	Code	[Segment Tree, Ordered Map]
716	Max Stack	Code	[Design]
717	1-bit and 2-bit Characters	Code	[Array]
718	Maximum Length of Repeated Subarray	Code	[Array, Hash Table, Binary Search, Dynamic Programming]
719	Find K-th Smallest Pair Distance	Code	[Array, Binary Search, Heap]
720	Longest Word in Dictionary	Code	[Hash Table, Trie]
721	Accounts Merge	Code	[Depth-first Search, Union Find]
722	Remove Comments	Code	[String]
723	Candy Crush	Code	[Array, Two Pointers]
724	Find Pivot Index	Code	[Array]
725	Split Linked List in Parts	Code	[Linked List]
726	Number of Atoms	Code	[Hash Table, Stack, Recursion]
727	Minimum Window Subsequence	Code	[Dynamic Programming, Sliding Window]
728	Self Dividing Numbers	Code	[Math]
729	My Calendar I	Code	[Array]
730	Count Different Palindromic Subsequences	Code	[String, Dynamic Programming]
731	My Calendar II	Code	[Ordered Map]
732	My Calendar III	Code	[Segment Tree, Ordered Map]
733	Flood Fill	Code	[Depth-first Search]
734	Sentence Similarity	Code	[Hash Table]
735	Asteroid Collision	Code	[Stack]
736	Parse Lisp Expression	Code	[String]
737	Sentence Similarity II	Code	[Depth-first Search, Union Find]
738	Monotone Increasing Digits	Code	[Greedy]
739	Daily Temperatures	Code	[Hash Table, Stack]
740	Delete and Earn	Code	[Dynamic Programming]
741	Cherry Pickup	Code	[Dynamic Programming]
742	Closest Leaf in a Binary Tree	Code	[Tree]
743	Network Delay Time	Code	[Heap, Depth-first Search, Breadth-first Search, Graph]
744	Find Smallest Letter Greater Than Target	Code	[Binary Search]
745	Prefix and Suffix Search	Code	[Trie]
746	Min Cost Climbing Stairs	Code	[Array, Dynamic Programming]
747	Largest Number At Least Twice of Others	Code	[Array]
748	Shortest Completing Word	Code	[Hash Table]
749	Contain Virus	Code	[Depth-first Search]
750	Number Of Corner Rectangles	Code	[Dynamic Programming]
751	IP to CIDR	Code	[Bit Manipulation]
752	Open the Lock	Code	[Breadth-first Search]
753	Cracking the Safe	Code	[Math, Depth-first Search]
754	Reach a Number	Code	[Math]
755	Pour Water	Code	[Array]
756	Pyramid Transition Matrix	Code	[Bit Manipulation, Depth-first Search]
757	Set Intersection Size At Least Two	Code	[Greedy]
758	Bold Words in String	Code	[String]
759	Employee Free Time	Code	[Heap, Greedy]
760	Find Anagram Mappings	Code	[Hash Table]
761	Special Binary String	Code	[String, Recursion]
762	Prime Number of Set Bits in Binary Representation	Code	[Bit Manipulation]
763	Partition Labels	Code	[Two Pointers, Greedy]
764	Largest Plus Sign	Code	[Dynamic Programming]
765	Couples Holding Hands	Code	[Greedy, Union Find, Graph]
766	Toeplitz Matrix	Code	[Array]
767	Reorganize String	Code	[String, Heap, Greedy, Sort]
768	Max Chunks To Make Sorted II	Code	[Array]
769	Max Chunks To Make Sorted	Code	[Array]
770	Basic Calculator IV	Code	[Hash Table, String, Stack]
771	Jewels and Stones	Code	[Hash Table]
772	Basic Calculator III	Code	[String, Stack]
773	Sliding Puzzle	Code	[Breadth-first Search]
774	Minimize Max Distance to Gas Station	Code	[Binary Search]
775	Global and Local Inversions	Code	[Array, Math]
776	Split BST	Code	[Tree, Recursion]
777	Swap Adjacent in LR String	Code	[Brainteaser]
778	Swim in Rising Water	Code	[Binary Search, Heap, Depth-first Search, Union Find]
779	K-th Symbol in Grammar	Code	[Recursion]
780	Reaching Points	Code	[Math]
781	Rabbits in Forest	Code	[Hash Table, Math]
782	Transform to Chessboard	Code	[Array, Math]
783	Minimum Distance Between BST Nodes	Code	[Tree, Recursion]
784	Letter Case Permutation	Code	[Backtracking, Bit Manipulation]
785	Is Graph Bipartite?	Code	[Depth-first Search, Breadth-first Search, Graph]
786	K-th Smallest Prime Fraction	Code	[Binary Search, Heap]
787	Cheapest Flights Within K Stops	Code	[Dynamic Programming, Heap, Breadth-first Search]
788	Rotated Digits	Code	[String]
789	Escape The Ghosts	Code	[Math]
790	Domino and Tromino Tiling	Code	[Dynamic Programming]
791	Custom Sort String	Code	[String]
792	Number of Matching Subsequences	Code	[Array]
793	Preimage Size of Factorial Zeroes Function	Code	[Binary Search]
794	Valid Tic-Tac-Toe State	Code	[Math, Recursion]
795	Number of Subarrays with Bounded Maximum	Code	[Array]
796	Rotate String	Code
797	All Paths From Source to Target	Code	[Backtracking, Depth-first Search, Graph]
798	Smallest Rotation with Highest Score	Code
799	Champagne Tower	Code	[Dynamic Programming]
800	Similar RGB Color	Code	[Math, String]
801	Minimum Swaps To Make Sequences Increasing	Code	[Dynamic Programming]
802	Find Eventual Safe States	Code	[Depth-first Search, Graph]
803	Bricks Falling When Hit	Code	[Union Find]
804	Unique Morse Code Words	Code	[String]
805	Split Array With Same Average	Code	[Math]
806	Number of Lines To Write String	Code
807	Max Increase to Keep City Skyline	Code
808	Soup Servings	Code	[Dynamic Programming]
809	Expressive Words	Code	[String]
810	Chalkboard XOR Game	Code	[Math]
811	Subdomain Visit Count	Code	[Hash Table]
812	Largest Triangle Area	Code	[Math]
813	Largest Sum of Averages	Code	[Dynamic Programming]
814	Binary Tree Pruning	Code	[Tree]
815	Bus Routes	Code	[Breadth-first Search]
816	Ambiguous Coordinates	Code	[String]
817	Linked List Components	Code	[Linked List]
818	Race Car	Code	[Dynamic Programming, Heap]
819	Most Common Word	Code	[String]
820	Short Encoding of Words	Code
821	Shortest Distance to a Character	Code
822	Card Flipping Game	Code
823	Binary Trees With Factors	Code
824	Goat Latin	Code	[String]
825	Friends Of Appropriate Ages	Code	[Array]
826	Most Profit Assigning Work	Code	[Two Pointers]
827	Making A Large Island	Code	[Depth-first Search]
828	Count Unique Characters of All Substrings of a Given String	Code	[Two Pointers]
829	Consecutive Numbers Sum	Code	[Math]
830	Positions of Large Groups	Code	[Array]
831	Masking Personal Information	Code	[String]
832	Flipping an Image	Code	[Array]
833	Find And Replace in String	Code	[String]
834	Sum of Distances in Tree	Code	[Tree, Depth-first Search]
835	Image Overlap	Code	[Array]
836	Rectangle Overlap	Code	[Math]
837	New 21 Game	Code	[Dynamic Programming]
838	Push Dominoes	Code	[Two Pointers, Dynamic Programming]
839	Similar String Groups	Code	[Depth-first Search, Union Find, Graph]
840	Magic Squares In Grid	Code	[Array]
841	Keys and Rooms	Code	[Depth-first Search, Graph]
842	Split Array into Fibonacci Sequence	Code	[String, Backtracking, Greedy]
843	Guess the Word	Code	[Minimax]
844	Backspace String Compare	Code	[Two Pointers, Stack]
845	Longest Mountain in Array	Code	[Two Pointers]
846	Hand of Straights	Code	[Ordered Map]
847	Shortest Path Visiting All Nodes	Code	[Dynamic Programming, Breadth-first Search]
848	Shifting Letters	Code	[String]
849	Maximize Distance to Closest Person	Code	[Array]
850	Rectangle Area II	Code	[Segment Tree, Line Sweep]
851	Loud and Rich	Code	[Depth-first Search]
852	Peak Index in a Mountain Array	Code	[Binary Search]
853	Car Fleet	Code	[Sort]
854	K-Similar Strings	Code	[Breadth-first Search, Graph]
855	Exam Room	Code	[Ordered Map]
856	Score of Parentheses	Code	[String, Stack]
857	Minimum Cost to Hire K Workers	Code	[Heap]
858	Mirror Reflection	Code	[Math]
859	Buddy Strings	Code	[String]
860	Lemonade Change	Code	[Greedy]
861	Score After Flipping Matrix	Code	[Greedy]
862	Shortest Subarray with Sum at Least K	Code	[Binary Search, Queue]
863	All Nodes Distance K in Binary Tree	Code	[Tree, Depth-first Search, Breadth-first Search]
864	Shortest Path to Get All Keys	Code	[Heap, Breadth-first Search]
865	Smallest Subtree with all the Deepest Nodes	Code	[Tree, Depth-first Search, Breadth-first Search, Recursion]
866	Prime Palindrome	Code	[Math]
867	Transpose Matrix	Code	[Array]
868	Binary Gap	Code	[Math]
869	Reordered Power of 2	Code	[Math]
870	Advantage Shuffle	Code	[Array, Greedy]
871	Minimum Number of Refueling Stops	Code	[Dynamic Programming, Heap]
872	Leaf-Similar Trees	Code	[Tree, Depth-first Search]
873	Length of Longest Fibonacci Subsequence	Code	[Array, Dynamic Programming]
874	Walking Robot Simulation	Code	[Greedy]
875	Koko Eating Bananas	Code	[Binary Search]
876	Middle of the Linked List	Code	[Linked List]
877	Stone Game	Code	[Math, Dynamic Programming, Minimax]
878	Nth Magical Number	Code	[Math, Binary Search]
879	Profitable Schemes	Code	[Dynamic Programming]
880	Decoded String at Index	Code	[Stack]
881	Boats to Save People	Code	[Two Pointers, Greedy]
882	Reachable Nodes In Subdivided Graph	Code	[Heap]
883	Projection Area of 3D Shapes	Code	[Math]
884	Uncommon Words from Two Sentences	Code	[Hash Table]
885	Spiral Matrix III	Code	[Math]
886	Possible Bipartition	Code	[Depth-first Search, Graph]
887	Super Egg Drop	Code	[Math, Binary Search, Dynamic Programming]
888	Fair Candy Swap	Code	[Array]
889	Construct Binary Tree from Preorder and Postorder Traversal	Code	[Tree]
890	Find and Replace Pattern	Code	[String]
891	Sum of Subsequence Widths	Code	[Array, Math]
892	Surface Area of 3D Shapes	Code	[Math, Geometry]
893	Groups of Special-Equivalent Strings	Code	[String]
894	All Possible Full Binary Trees	Code	[Tree, Recursion]
895	Maximum Frequency Stack	Code	[Hash Table, Stack]
896	Monotonic Array	Code	[Array]
897	Increasing Order Search Tree	Code	[Tree, Depth-first Search, Recursion]
898	Bitwise ORs of Subarrays	Code	[Dynamic Programming, Bit Manipulation]
899	Orderly Queue	Code	[Math, String]
900	RLE Iterator	Code	[Array]
901	Online Stock Span	Code	[Stack]
902	Numbers At Most N Given Digit Set	Code	[Math, Dynamic Programming]
903	Valid Permutations for DI Sequence	Code	[Divide and Conquer, Dynamic Programming]
904	Fruit Into Baskets	Code	[Two Pointers]
905	Sort Array By Parity	Code	[Array]
906	Super Palindromes	Code	[Math]
907	Sum of Subarray Minimums	Code	[Array, Stack]
908	Smallest Range I	Code	[Math]
909	Snakes and Ladders	Code	[Breadth-first Search]
910	Smallest Range II	Code	[Math, Greedy]
911	Online Election	Code	[Binary Search]
912	Sort an Array	Code
913	Cat and Mouse	Code	[Breadth-first Search, Minimax]
914	X of a Kind in a Deck of Cards	Code	[Array, Math]
915	Partition Array into Disjoint Intervals	Code	[Array]
916	Word Subsets	Code	[String]
917	Reverse Only Letters	Code	[String]
918	Maximum Sum Circular Subarray	Code	[Array]
919	Complete Binary Tree Inserter	Code	[Tree]
920	Number of Music Playlists	Code	[Dynamic Programming]
921	Minimum Add to Make Parentheses Valid	Code	[Stack, Greedy]
922	Sort Array By Parity II	Code	[Array, Sort]
923	3Sum With Multiplicity	Code	[Two Pointers]
924	Minimize Malware Spread	Code	[Depth-first Search, Union Find]
925	Long Pressed Name	Code	[Two Pointers, String]
926	Flip String to Monotone Increasing	Code	[Array]
927	Three Equal Parts	Code	[Math, Binary Search, Greedy]
928	Minimize Malware Spread II	Code	[Depth-first Search, Union Find, Graph]
929	Unique Email Addresses	Code	[String]
930	Binary Subarrays With Sum	Code	[Hash Table, Two Pointers]
931	Minimum Falling Path Sum	Code	[Dynamic Programming]
932	Beautiful Array	Code	[Divide and Conquer]
933	Number of Recent Calls	Code	[Queue]
934	Shortest Bridge	Code	[Depth-first Search, Breadth-first Search]
935	Knight Dialer	Code	[Dynamic Programming]
936	Stamping The Sequence	Code	[String, Greedy]
937	Reorder Data in Log Files	Code	[String]
938	Range Sum of BST	Code	[Tree, Depth-first Search, Recursion]
939	Minimum Area Rectangle	Code	[Hash Table]
940	Distinct Subsequences II	Code	[Dynamic Programming]
941	Valid Mountain Array	Code	[Array]
942	DI String Match	Code	[Math]
943	Find the Shortest Superstring	Code	[Dynamic Programming]
944	Delete Columns to Make Sorted	Code	[Greedy]
945	Minimum Increment to Make Array Unique	Code	[Array]
946	Validate Stack Sequences	Code	[Stack]
947	Most Stones Removed with Same Row or Column	Code	[Depth-first Search, Union Find]
948	Bag of Tokens	Code	[Two Pointers, Greedy, Sort]
949	Largest Time for Given Digits	Code	[Math]
950	Reveal Cards In Increasing Order	Code	[Array]
951	Flip Equivalent Binary Trees	Code	[Tree]
952	Largest Component Size by Common Factor	Code	[Math, Union Find]
953	Verifying an Alien Dictionary	Code	[Hash Table]
954	Array of Doubled Pairs	Code	[Array, Hash Table]
955	Delete Columns to Make Sorted II	Code	[Greedy]
956	Tallest Billboard	Code	[Dynamic Programming]
957	Prison Cells After N Days	Code	[Hash Table]
958	Check Completeness of a Binary Tree	Code	[Tree]
959	Regions Cut By Slashes	Code	[Depth-first Search, Union Find, Graph]
960	Delete Columns to Make Sorted III	Code	[Dynamic Programming]
961	N-Repeated Element in Size 2N Array	Code	[Hash Table]
962	Maximum Width Ramp	Code	[Array]
963	Minimum Area Rectangle II	Code	[Math, Geometry]
964	Least Operators to Express Number	Code	[Math, Dynamic Programming]
965	Univalued Binary Tree	Code	[Tree]
966	Vowel Spellchecker	Code	[Hash Table, String]
967	Numbers With Same Consecutive Differences	Code	[Backtracking, Depth-first Search, Breadth-first Search, Recursion]
968	Binary Tree Cameras	Code	[Dynamic Programming, Tree, Depth-first Search]
969	Pancake Sorting	Code	[Array, Sort]
970	Powerful Integers	Code	[Hash Table, Math]
971	Flip Binary Tree To Match Preorder Traversal	Code	[Tree, Depth-first Search]
972	Equal Rational Numbers	Code	[Math]
973	K Closest Points to Origin	Code	[Divide and Conquer, Heap, Sort]
974	Subarray Sums Divisible by K	Code	[Array, Hash Table]
975	Odd Even Jump	Code	[Dynamic Programming, Stack, Ordered Map]
976	Largest Perimeter Triangle	Code	[Math, Sort]
977	Squares of a Sorted Array	Code	[Array, Two Pointers]
978	Longest Turbulent Subarray	Code	[Array, Dynamic Programming, Sliding Window]
979	Distribute Coins in Binary Tree	Code	[Tree, Depth-first Search]
980	Unique Paths III	Code	[Backtracking, Depth-first Search]
981	Time Based Key-Value Store	Code	[Hash Table, Binary Search]
982	Triples with Bitwise AND Equal To Zero	Code	[Dynamic Programming]
983	Minimum Cost For Tickets	Code	[Dynamic Programming]
984	String Without AAA or BBB	Code	[Greedy]
985	Sum of Even Numbers After Queries	Code	[Array]
986	Interval List Intersections	Code	[Two Pointers]
987	Vertical Order Traversal of a Binary Tree	Code	[Hash Table, Tree]
988	Smallest String Starting From Leaf	Code	[Tree, Depth-first Search]
989	Add to Array-Form of Integer	Code	[Array]
990	Satisfiability of Equality Equations	Code	[Union Find, Graph]
991	Broken Calculator	Code	[Math, Greedy]
992	Subarrays with K Different Integers	Code	[Hash Table, Two Pointers, Sliding Window]
993	Cousins in Binary Tree	Code	[Tree, Breadth-first Search]
994	Rotting Oranges	Code	[Breadth-first Search]
995	Minimum Number of K Consecutive Bit Flips	Code	[Greedy, Sliding Window]
996	Number of Squareful Arrays	Code	[Math, Backtracking, Graph]
997	Find the Town Judge	Code	[Graph]
998	Maximum Binary Tree II	Code	[Tree]
999	Available Captures for Rook	Code	[Array]
1000	Minimum Cost to Merge Stones	Code	[Dynamic Programming]
1001	Grid Illumination	Code	[Hash Table]
1002	Find Common Characters	Code	[Array, Hash Table]
1003	Check If Word Is Valid After Substitutions	Code	[String, Stack]
1004	Max Consecutive Ones III	Code	[Two Pointers, Sliding Window]
1005	Maximize Sum Of Array After K Negations	Code	[Greedy]
1006	Clumsy Factorial	Code	[Math]
1007	Minimum Domino Rotations For Equal Row	Code	[Array, Greedy]
1008	Construct Binary Search Tree from Preorder Traversal	Code	[Tree]
1009	Complement of Base 10 Integer	Code	[Math]
1010	Pairs of Songs With Total Durations Divisible by 60	Code	[Array]
1011	Capacity To Ship Packages Within D Days	Code	[Array, Binary Search]
1012	Numbers With Repeated Digits	Code	[Math, Dynamic Programming]
1013	Partition Array Into Three Parts With Equal Sum	Code	[Array]
1014	Best Sightseeing Pair	Code	[Array]
1015	Smallest Integer Divisible by K	Code	[Math]
1016	Binary String With Substrings Representing 1 To N	Code	[String]
1017	Convert to Base -2	Code	[Math]
1018	Binary Prefix Divisible By 5	Code	[Array]
1019	Next Greater Node In Linked List	Code	[Linked List, Stack]
1020	Number of Enclaves	Code	[Depth-first Search]
1021	Remove Outermost Parentheses	Code	[Stack]
1022	Sum of Root To Leaf Binary Numbers	Code	[Tree]
1023	Camelcase Matching	Code	[String, Trie]
1024	Video Stitching	Code	[Dynamic Programming]
1025	Divisor Game	Code	[Math, Dynamic Programming]
1026	Maximum Difference Between Node and Ancestor	Code	[Tree, Depth-first Search]
1027	Longest Arithmetic Subsequence	Code	[Dynamic Programming]
1028	Recover a Tree From Preorder Traversal	Code	[Tree, Depth-first Search]
1029	Two City Scheduling	Code	[Greedy]
1030	Matrix Cells in Distance Order	Code	[Sort]
1031	Maximum Sum of Two Non-Overlapping Subarrays	Code	[Array]
1032	Stream of Characters	Code	[Trie]
1033	Moving Stones Until Consecutive	Code	[Brainteaser]
1034	Coloring A Border	Code	[Depth-first Search]
1035	Uncrossed Lines	Code	[Array]
1036	Escape a Large Maze	Code	[Breadth-first Search]
1037	Valid Boomerang	Code	[Math]
1038	Binary Search Tree to Greater Sum Tree	Code	[Binary Search Tree]
1039	Minimum Score Triangulation of Polygon	Code	[Dynamic Programming]
1040	Moving Stones Until Consecutive II	Code	[Array, Sliding Window]
1041	Robot Bounded In Circle	Code	[Math]
1042	Flower Planting With No Adjacent	Code	[Graph]
1043	Partition Array for Maximum Sum	Code	[Dynamic Programming]
1044	Longest Duplicate Substring	Code	[Hash Table, Binary Search, Suffix Array]
1045	Customers Who Bought All Products	Code
1046	Last Stone Weight	Code	[Heap, Greedy]
1047	Remove All Adjacent Duplicates In String	Code	[Stack]
1048	Longest String Chain	Code	[Hash Table, Dynamic Programming]
1049	Last Stone Weight II	Code	[Dynamic Programming]
1050	Actors and Directors Who Cooperated At Least Three Times	Code
1051	Height Checker	Code	[Array]
1052	Grumpy Bookstore Owner	Code	[Array, Sliding Window]
1053	Previous Permutation With One Swap	Code	[Array, Greedy]
1054	Distant Barcodes	Code	[Heap, Sort]
1055	Shortest Way to Form String	Code	[Dynamic Programming, Greedy]
1056	Confusing Number	Code	[Math]
1057	Campus Bikes	Code	[Greedy, Sort]
1058	Minimize Rounding Error to Meet Target	Code	[Math, Dynamic Programming, Greedy]
1059	All Paths from Source Lead to Destination	Code	[Depth-first Search, Graph]
1060	Missing Element in Sorted Array	Code	[Binary Search]
1061	Lexicographically Smallest Equivalent String	Code	[Depth-first Search, Union Find]
1062	Longest Repeating Substring	Code	[String]
1063	Number of Valid Subarrays	Code	[Stack]
1064	Fixed Point	Code	[Array, Binary Search]
1065	Index Pairs of a String	Code	[String, Trie]
1066	Campus Bikes II	Code	[Dynamic Programming, Backtracking]
1067	Digit Count in Range	Code	[Math, Dynamic Programming]
1068	Product Sales Analysis I	Code
1069	Product Sales Analysis II	Code
1070	Product Sales Analysis III	Code
1071	Greatest Common Divisor of Strings	Code	[String]
1072	Flip Columns For Maximum Number of Equal Rows	Code	[Hash Table]
1073	Adding Two Negabinary Numbers	Code	[Math]
1074	Number of Submatrices That Sum to Target	Code	[Array, Dynamic Programming, Sliding Window]
1075	Project Employees I	Code
1076	Project Employees II	Code
1077	Project Employees III	Code
1078	Occurrences After Bigram	Code	[Hash Table]
1079	Letter Tile Possibilities	Code	[Backtracking]
1080	Insufficient Nodes in Root to Leaf Paths	Code	[Depth-first Search]
1081	Smallest Subsequence of Distinct Characters	Code	[String, Stack, Greedy]
1082	Sales Analysis I	Code
1083	Sales Analysis II	Code
1084	Sales Analysis III	Code
1085	Sum of Digits in the Minimum Number	Code	[Array]
1086	High Five	Code	[Array, Hash Table, Sort]
1087	Brace Expansion	Code	[Backtracking]
1088	Confusing Number II	Code	[Math, Backtracking]
1089	Duplicate Zeros	Code	[Array]
1090	Largest Values From Labels	Code	[Hash Table, Greedy]
1091	Shortest Path in Binary Matrix	Code	[Breadth-first Search]
1092	Shortest Common Supersequence	Code	[Dynamic Programming]
1093	Statistics from a Large Sample	Code	[Math, Two Pointers]
1094	Car Pooling	Code	[Greedy]
1095	Find in Mountain Array	Code	[Binary Search]
1096	Brace Expansion II	Code	[String]
1097	Game Play Analysis V	Code
1098	Unpopular Books	Code
1099	Two Sum Less Than K	Code	[Array, Two Pointers, Sort]
1100	Find K-Length Substrings With No Repeated Characters	Code	[String, Sliding Window]
1101	The Earliest Moment When Everyone Become Friends	Code	[Union Find]
1102	Path With Maximum Minimum Value	Code	[Depth-first Search, Union Find, Graph]
1103	Distribute Candies to People	Code	[Math]
1104	Path In Zigzag Labelled Binary Tree	Code	[Math, Tree]
1105	Filling Bookcase Shelves	Code	[Dynamic Programming]
1106	Parsing A Boolean Expression	Code	[String]
1107	New Users Daily Count	Code
1108	Defanging an IP Address	Code	[String]
1109	Corporate Flight Bookings	Code	[Array, Math]
1110	Delete Nodes And Return Forest	Code	[Tree, Depth-first Search]
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Code	[Binary Search, Greedy]
1112	Highest Grade For Each Student	Code
1113	Reported Posts	Code
1114	Print in Order	Code
1115	Print FooBar Alternately	Code
1116	Print Zero Even Odd	Code
1117	Building H2O	Code
1118	Number of Days in a Month	Code
1119	Remove Vowels from a String	Code	[String]
1120	Maximum Average Subtree	Code	[Tree]
1121	Divide Array Into Increasing Sequences	Code	[Math]
1122	Relative Sort Array	Code	[Array, Sort]
1123	Lowest Common Ancestor of Deepest Leaves	Code	[Tree, Depth-first Search]
1124	Longest Well-Performing Interval	Code	[Stack]
1125	Smallest Sufficient Team	Code	[Dynamic Programming, Bit Manipulation]
1126	Active Businesses	Code
1127	User Purchase Platform	Code
1128	Number of Equivalent Domino Pairs	Code	[Array]
1129	Shortest Path with Alternating Colors	Code	[Breadth-first Search, Graph]
1130	Minimum Cost Tree From Leaf Values	Code	[Dynamic Programming, Stack, Tree]
1131	Maximum of Absolute Value Expression	Code	[Math, Bit Manipulation]
1132	Reported Posts II	Code
1133	Largest Unique Number	Code	[Array, Hash Table]
1134	Armstrong Number	Code	[Math]
1135	Connecting Cities With Minimum Cost	Code	[Union Find, Graph]
1136	Parallel Courses	Code	[Dynamic Programming, Depth-first Search, Graph]
1137	N-th Tribonacci Number	Code	[Recursion]
1138	Alphabet Board Path	Code	[Hash Table, String]
1139	Largest 1-Bordered Square	Code	[Dynamic Programming]
1140	Stone Game II	Code	[Dynamic Programming]
1141	User Activity for the Past 30 Days I	Code
1142	User Activity for the Past 30 Days II	Code
1143	Longest Common Subsequence	Code	[Dynamic Programming]
1144	Decrease Elements To Make Array Zigzag	Code	[Array]
1145	Binary Tree Coloring Game	Code	[Tree, Depth-first Search]
1146	Snapshot Array	Code	[Array]
1147	Longest Chunked Palindrome Decomposition	Code	[Dynamic Programming, Rolling Hash]
1148	Article Views I	Code
1149	Article Views II	Code
1150	Check If a Number Is Majority Element in a Sorted Array	Code	[Array, Binary Search]
1151	Minimum Swaps to Group All 1’s Together	Code	[Array, Sliding Window]
1152	Analyze User Website Visit Pattern	Code	[Array, Hash Table, Sort]
1153	String Transforms Into Another String	Code	[Graph]
1154	Day of the Year	Code	[Math]
1155	Number of Dice Rolls With Target Sum	Code	[Dynamic Programming]
1156	Swap For Longest Repeated Character Substring	Code	[String]
1157	Online Majority Element In Subarray	Code	[Array, Binary Search, Segment Tree]
1158	Market Analysis I	Code
1159	Market Analysis II	Code
1160	Find Words That Can Be Formed by Characters	Code	[Array, Hash Table]
1161	Maximum Level Sum of a Binary Tree	Code	[Tree, Breadth-first Search]
1162	As Far from Land as Possible	Code	[Breadth-first Search, Graph]
1163	Last Substring in Lexicographical Order	Code	[String, Suffix Array]
1164	Product Price at a Given Date	Code
1165	Single-Row Keyboard	Code	[String]
1166	Design File System	Code	[Hash Table, Design]
1167	Minimum Cost to Connect Sticks	Code	[Greedy]
1168	Optimize Water Distribution in a Village	Code	[Union Find, Graph]
1169	Invalid Transactions	Code	[Array, String]
1170	Compare Strings by Frequency of the Smallest Character	Code	[Array, String]
1171	Remove Zero Sum Consecutive Nodes from Linked List	Code	[Linked List]
1172	Dinner Plate Stacks	Code	[Design]
1173	Immediate Food Delivery I	Code
1174	Immediate Food Delivery II	Code
1175	Prime Arrangements	Code	[Math]
1176	Diet Plan Performance	Code	[Array, Sliding Window]
1177	Can Make Palindrome from Substring	Code	[Array, String]
1178	Number of Valid Words for Each Puzzle	Code	[Hash Table, Bit Manipulation]
1179	Reformat Department Table	Code
1180	Count Substrings with Only One Distinct Letter	Code	[Math, String]
1181	Before and After Puzzle	Code	[String]
1182	Shortest Distance to Target Color	Code	[Binary Search]
1183	Maximum Number of Ones	Code	[Math, Sort]
1184	Distance Between Bus Stops	Code	[Array]
1185	Day of the Week	Code	[Array]
1186	Maximum Subarray Sum with One Deletion	Code	[Dynamic Programming]
1187	Make Array Strictly Increasing	Code	[Dynamic Programming]
1188	Design Bounded Blocking Queue	Code
1189	Maximum Number of Balloons	Code	[Hash Table, String]
1190	Reverse Substrings Between Each Pair of Parentheses	Code	[Stack]
1191	K-Concatenation Maximum Sum	Code	[Dynamic Programming]
1192	Critical Connections in a Network	Code	[Depth-first Search]
1193	Monthly Transactions I	Code
1194	Tournament Winners	Code
1195	Fizz Buzz Multithreaded	Code
1196	How Many Apples Can You Put into the Basket	Code	[Greedy]
1197	Minimum Knight Moves	Code	[Breadth-first Search]
1198	Find Smallest Common Element in All Rows	Code	[Hash Table, Binary Search]
1199	Minimum Time to Build Blocks	Code	[Math, Dynamic Programming]
1200	Minimum Absolute Difference	Code	[Array]
1201	Ugly Number III	Code	[Math, Binary Search]
1202	Smallest String With Swaps	Code	[Array, Union Find]
1203	Sort Items by Groups Respecting Dependencies	Code	[Depth-first Search, Graph, Topological Sort]
1204	Last Person to Fit in the Elevator	Code
1205	Monthly Transactions II	Code
1206	Design Skiplist	Code	[Design]
1207	Unique Number of Occurrences	Code	[Hash Table]
1208	Get Equal Substrings Within Budget	Code	[Array, Sliding Window]
1209	Remove All Adjacent Duplicates in String II	Code	[Stack]
1210	Minimum Moves to Reach Target with Rotations	Code	[Breadth-first Search]
1211	Queries Quality and Percentage	Code
1212	Team Scores in Football Tournament	Code
1213	Intersection of Three Sorted Arrays	Code	[Hash Table, Two Pointers]
1214	Two Sum BSTs	Code	[Binary Search Tree]
1215	Stepping Numbers	Code	[Backtracking]
1216	Valid Palindrome III	Code	[String, Dynamic Programming]
1217	Minimum Cost to Move Chips to The Same Position	Code	[Array, Math, Greedy]
1218	Longest Arithmetic Subsequence of Given Difference	Code	[Math, Dynamic Programming]
1219	Path with Maximum Gold	Code	[Backtracking]
1220	Count Vowels Permutation	Code	[Dynamic Programming]
1221	Split a String in Balanced Strings	Code	[String, Greedy]
1222	Queens That Can Attack the King	Code	[Array]
1223	Dice Roll Simulation	Code	[Dynamic Programming]
1224	Maximum Equal Frequency	Code	[Hash Table]
1225	Report Contiguous Dates	Code
1226	The Dining Philosophers	Code
1227	Airplane Seat Assignment Probability	Code	[Math, Dynamic Programming, Brainteaser]
1228	Missing Number In Arithmetic Progression	Code	[Math]
1229	Meeting Scheduler	Code	[Line Sweep]
1230	Toss Strange Coins	Code	[Math, Dynamic Programming]
1231	Divide Chocolate	Code	[Binary Search, Greedy]
1232	Check If It Is a Straight Line	Code	[Array, Math, Geometry]
1233	Remove Sub-Folders from the Filesystem	Code	[Array, String]
1234	Replace the Substring for Balanced String	Code	[Two Pointers, String]
1235	Maximum Profit in Job Scheduling	Code	[Binary Search, Dynamic Programming, Sort]
1236	Web Crawler	Code	[Depth-first Search, Breadth-first Search]
1237	Find Positive Integer Solution for a Given Equation	Code	[Math, Binary Search]
1238	Circular Permutation in Binary Representation	Code	[Math]
1239	Maximum Length of a Concatenated String with Unique Characters	Code	[Backtracking, Bit Manipulation]
1240	Tiling a Rectangle with the Fewest Squares	Code	[Dynamic Programming, Backtracking]
1241	Number of Comments per Post	Code
1242	Web Crawler Multithreaded	Code	[Depth-first Search, Breadth-first Search]
1243	Array Transformation	Code	[Array]
1244	Design A Leaderboard	Code	[Hash Table, Sort, Design]
1245	Tree Diameter	Code	[Tree, Depth-first Search, Breadth-first Search]
1246	Palindrome Removal	Code	[Dynamic Programming]
1247	Minimum Swaps to Make Strings Equal	Code	[String, Greedy]
1248	Count Number of Nice Subarrays	Code	[Two Pointers]
1249	Minimum Remove to Make Valid Parentheses	Code	[String, Stack]
1250	Check If It Is a Good Array	Code	[Math]
1251	Average Selling Price	Code
1252	Cells with Odd Values in a Matrix	Code	[Array]
1253	Reconstruct a 2-Row Binary Matrix	Code	[Math, Greedy]
1254	Number of Closed Islands	Code	[Depth-first Search]
1255	Maximum Score Words Formed by Letters	Code	[Bit Manipulation]
1256	Encode Number	Code	[Math, Bit Manipulation]
1257	Smallest Common Region	Code	[Tree]
1258	Synonymous Sentences	Code	[Backtracking]
1259	Handshakes That Don’t Cross	Code	[Math, Dynamic Programming]
1260	Shift 2D Grid	Code	[Array]
1261	Find Elements in a Contaminated Binary Tree	Code	[Hash Table, Tree]
1262	Greatest Sum Divisible by Three	Code	[Dynamic Programming]
1263	Minimum Moves to Move a Box to Their Target Location	Code	[Breadth-first Search]
1264	Page Recommendations	Code
1265	Print Immutable Linked List in Reverse	Code
1266	Minimum Time Visiting All Points	Code	[Array, Geometry]
1267	Count Servers that Communicate	Code	[Array, Graph]
1268	Search Suggestions System	Code	[String]
1269	Number of Ways to Stay in the Same Place After Some Steps	Code	[Dynamic Programming]
1270	All People Report to the Given Manager	Code
1271	Hexspeak	Code	[Math, String]
1272	Remove Interval	Code	[Math, Line Sweep]
1273	Delete Tree Nodes	Code	[Dynamic Programming, Depth-first Search]
1274	Number of Ships in a Rectangle	Code	[Divide and Conquer]
1275	Find Winner on a Tic Tac Toe Game	Code	[Array]
1276	Number of Burgers with No Waste of Ingredients	Code	[Math, Greedy]
1277	Count Square Submatrices with All Ones	Code	[Array, Dynamic Programming]
1278	Palindrome Partitioning III	Code	[Dynamic Programming]
1279	Traffic Light Controlled Intersection	Code
1280	Students and Examinations	Code
1281	Subtract the Product and Sum of Digits of an Integer	Code	[Math]
1282	Group the People Given the Group Size They Belong To	Code	[Greedy]
1283	Find the Smallest Divisor Given a Threshold	Code	[Binary Search]
1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Code	[Breadth-first Search]
1285	Find the Start and End Number of Continuous Ranges	Code
1286	Iterator for Combination	Code	[Backtracking, Design]
1287	Element Appearing More Than 25% In Sorted Array	Code	[Array]
1288	Remove Covered Intervals	Code	[Greedy, Sort, Line Sweep]
1289	Minimum Falling Path Sum II	Code	[Dynamic Programming]
1290	Convert Binary Number in a Linked List to Integer	Code	[Linked List, Bit Manipulation]
1291	Sequential Digits	Code	[Backtracking]
1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Code	[Array, Binary Search]
1293	Shortest Path in a Grid with Obstacles Elimination	Code	[Breadth-first Search]
1294	Weather Type in Each Country	Code
1295	Find Numbers with Even Number of Digits	Code	[Array]
1296	Divide Array in Sets of K Consecutive Numbers	Code	[Array, Greedy]
1297	Maximum Number of Occurrences of a Substring	Code	[String, Bit Manipulation]
1298	Maximum Candies You Can Get from Boxes	Code	[Breadth-first Search]
1299	Replace Elements with Greatest Element on Right Side	Code	[Array]
1300	Sum of Mutated Array Closest to Target	Code	[Array, Binary Search]
1301	Number of Paths with Max Score	Code	[Dynamic Programming]
1302	Deepest Leaves Sum	Code	[Tree, Depth-first Search]
1303	Find the Team Size	Code
1304	Find N Unique Integers Sum up to Zero	Code	[Array]
1305	All Elements in Two Binary Search Trees	Code	[Sort, Tree]
1306	Jump Game III	Code	[Depth-first Search, Breadth-first Search, Recursion]
1307	Verbal Arithmetic Puzzle	Code	[Math, Backtracking]
1308	Running Total for Different Genders	Code
1309	Decrypt String from Alphabet to Integer Mapping	Code	[String]
1310	XOR Queries of a Subarray	Code	[Bit Manipulation]
1311	Get Watched Videos by Your Friends	Code	[Hash Table, String, Breadth-first Search]
1312	Minimum Insertion Steps to Make a String Palindrome	Code	[Dynamic Programming]
1313	Decompress Run-Length Encoded List	Code	[Array]
1314	Matrix Block Sum	Code	[Dynamic Programming]
1315	Sum of Nodes with Even-Valued Grandparent	Code	[Tree, Depth-first Search]
1316	Distinct Echo Substrings	Code	[String, Rolling Hash]
1317	Convert Integer to the Sum of Two No-Zero Integers	Code	[Math]
1318	Minimum Flips to Make a OR b Equal to c	Code	[Bit Manipulation]
1319	Number of Operations to Make Network Connected	Code	[Depth-first Search, Breadth-first Search, Union Find]
1320	Minimum Distance to Type a Word Using Two Fingers	Code	[Dynamic Programming]
1321	Restaurant Growth	Code
1322	Ads Performance	Code
1323	Maximum 69 Number	Code	[Math]
1324	Print Words Vertically	Code	[String]
1325	Delete Leaves With a Given Value	Code	[Tree]
1326	Minimum Number of Taps to Open to Water a Garden	Code	[Dynamic Programming, Greedy]
1327	List the Products Ordered in a Period	Code
1328	Break a Palindrome	Code	[String]
1329	Sort the Matrix Diagonally	Code	[Array, Sort]
1330	Reverse Subarray To Maximize Array Value	Code	[Array, Math]
1331	Rank Transform of an Array	Code	[Array]
1332	Remove Palindromic Subsequences	Code	[String]
1333	Filter Restaurants by Vegan-Friendly, Price and Distance	Code	[Array, Sort]
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Code	[Graph]
1335	Minimum Difficulty of a Job Schedule	Code	[Dynamic Programming]
1336	Number of Transactions per Visit	Code
1337	The K Weakest Rows in a Matrix	Code	[Array, Binary Search]
1338	Reduce Array Size to The Half	Code	[Array, Greedy]
1339	Maximum Product of Splitted Binary Tree	Code	[Dynamic Programming, Tree, Depth-first Search]
1340	Jump Game V	Code	[Dynamic Programming]
1341	Movie Rating	Code
1342	Number of Steps to Reduce a Number to Zero	Code	[Bit Manipulation]
1343	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Code	[Array]
1344	Angle Between Hands of a Clock	Code	[Math]
1345	Jump Game IV	Code	[Breadth-first Search]
1346	Check If N and Its Double Exist	Code	[Array]
1347	Minimum Number of Steps to Make Two Strings Anagram	Code	[String]
1348	Tweet Counts Per Frequency	Code	[Design]
1349	Maximum Students Taking Exam	Code	[Dynamic Programming]
1350	Students With Invalid Departments	Code
1351	Count Negative Numbers in a Sorted Matrix	Code	[Array, Binary Search]
1352	Product of the Last K Numbers	Code	[Array, Design]
1353	Maximum Number of Events That Can Be Attended	Code	[Greedy, Sort, Segment Tree]
1354	Construct Target Array With Multiple Sums	Code	[Greedy]
1355	Activity Participants	Code
1356	Sort Integers by The Number of 1 Bits	Code	[Sort, Bit Manipulation]
1357	Apply Discount Every n Orders	Code	[Design]
1358	Number of Substrings Containing All Three Characters	Code	[String]
1359	Count All Valid Pickup and Delivery Options	Code	[Math, Dynamic Programming]
1360	Number of Days Between Two Dates	Code
1361	Validate Binary Tree Nodes	Code	[Graph]
1362	Closest Divisors	Code	[Math]
1363	Largest Multiple of Three	Code	[Math, Dynamic Programming]
1364	Number of Trusted Contacts of a Customer	Code
1365	How Many Numbers Are Smaller Than the Current Number	Code	[Array, Hash Table]
1366	Rank Teams by Votes	Code	[Array, Sort]
1367	Linked List in Binary Tree	Code	[Linked List, Dynamic Programming, Tree]
1368	Minimum Cost to Make at Least One Valid Path in a Grid	Code	[Breadth-first Search]
1369	Get the Second Most Recent Activity	Code
1370	Increasing Decreasing String	Code	[String, Sort]
1371	Find the Longest Substring Containing Vowels in Even Counts	Code	[String]
1372	Longest ZigZag Path in a Binary Tree	Code	[Dynamic Programming, Tree]
1373	Maximum Sum BST in Binary Tree	Code	[Dynamic Programming, Binary Search Tree]
1374	Generate a String With Characters That Have Odd Counts	Code	[String]
1375	Bulb Switcher III	Code	[Array]
1376	Time Needed to Inform All Employees	Code	[Depth-first Search]
1377	Frog Position After T Seconds	Code	[Depth-first Search]
1378	Replace Employee ID With The Unique Identifier	Code
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Code	[Tree]
1380	Lucky Numbers in a Matrix	Code	[Array]
1381	Design a Stack With Increment Operation	Code	[Stack, Design]
1382	Balance a Binary Search Tree	Code	[Binary Search Tree]
1383	Maximum Performance of a Team	Code	[Greedy, Sort]
1384	Total Sales Amount by Year	Code
1385	Find the Distance Value Between Two Arrays	Code	[Array]
1386	Cinema Seat Allocation	Code	[Array, Greedy]
1387	Sort Integers by The Power Value	Code	[Sort, Graph]
1388	Pizza With 3n Slices	Code	[Dynamic Programming]
1389	Create Target Array in the Given Order	Code	[Array]
1390	Four Divisors	Code	[Math]
1391	Check if There is a Valid Path in a Grid	Code	[Depth-first Search, Breadth-first Search]
1392	Longest Happy Prefix	Code	[String]
1393	Capital Gain/Loss	Code
1394	Find Lucky Integer in an Array	Code	[Array]
1395	Count Number of Teams	Code	[Array]
1396	Design Underground System	Code	[Design]
1397	Find All Good Strings	Code	[Dynamic Programming]
1398	Customers Who Bought Products A and B but Not C	Code
1399	Count Largest Group	Code	[Array]
1400	Construct K Palindrome Strings	Code	[Greedy]
1401	Circle and Rectangle Overlapping	Code	[Geometry]
1402	Reducing Dishes	Code	[Dynamic Programming]
1403	Minimum Subsequence in Non-Increasing Order	Code	[Greedy, Sort]
1404	Number of Steps to Reduce a Number in Binary Representation to One	Code	[String, Bit Manipulation]
1405	Longest Happy String	Code	[Dynamic Programming, Greedy]
1406	Stone Game III	Code	[Dynamic Programming]
1407	Top Travellers	Code
1408	String Matching in an Array	Code	[String]
1409	Queries on a Permutation With Key	Code	[Array]
1410	HTML Entity Parser	Code	[String, Stack]
1411	Number of Ways to Paint N × 3 Grid	Code	[Dynamic Programming]
1412	Find the Quiet Students in All Exams	Code
1413	Minimum Value to Get Positive Step by Step Sum	Code	[Array]
1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Code	[Array, Greedy]
1415	The k-th Lexicographical String of All Happy Strings of Length n	Code	[Backtracking]
1416	Restore The Array	Code	[Dynamic Programming]
1417	Reformat The String	Code	[String]
1418	Display Table of Food Orders in a Restaurant	Code	[Hash Table]
1419	Minimum Number of Frogs Croaking	Code	[String]
1420	Build Array Where You Can Find The Maximum Exactly K Comparisons	Code	[Dynamic Programming]
1421	NPV Queries	Code
1422	Maximum Score After Splitting a String	Code	[String]
1423	Maximum Points You Can Obtain from Cards	Code	[Array, Dynamic Programming, Sliding Window]
1424	Diagonal Traverse II	Code	[Array, Sort]
1425	Constrained Subsequence Sum	Code	[Dynamic Programming]
1426	Counting Elements	Code	[Array]
1427	Perform String Shifts	Code	[Array, Math]
1428	Leftmost Column with at Least a One	Code	[Array]
1429	First Unique Number	Code	[Hash Table, Design]
1430	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	Code	[Tree]
1431	Kids With the Greatest Number of Candies	Code	[Array]
1432	Max Difference You Can Get From Changing an Integer	Code	[String]
1433	Check If a String Can Break Another String	Code	[String, Greedy]
1434	Number of Ways to Wear Different Hats to Each Other	Code	[Dynamic Programming, Bit Manipulation]
1435	Create a Session Bar Chart	Code
1436	Destination City	Code	[String]
1437	Check If All 1’s Are at Least Length K Places Away	Code	[Array]
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Code	[Array, Sliding Window]
1439	Find the Kth Smallest Sum of a Matrix With Sorted Rows	Code	[Heap]
1440	Evaluate Boolean Expression	Code
1441	Build an Array With Stack Operations	Code	[Stack]
1442	Count Triplets That Can Form Two Arrays of Equal XOR	Code	[Array, Math, Bit Manipulation]
1443	Minimum Time to Collect All Apples in a Tree	Code	[Tree, Depth-first Search]
1444	Number of Ways of Cutting a Pizza	Code	[Dynamic Programming]
1445	Apples & Oranges	Code
1446	Consecutive Characters	Code	[String]
1447	Simplified Fractions	Code	[Math]
1448	Count Good Nodes in Binary Tree	Code	[Tree, Depth-first Search]
1449	Form Largest Integer With Digits That Add up to Target	Code	[String, Dynamic Programming]
1450	Number of Students Doing Homework at a Given Time	Code	[Array]
1451	Rearrange Words in a Sentence	Code	[String, Sort]
1452	People Whose List of Favorite Companies Is Not a Subset of Another List	Code	[String, Sort]
1453	Maximum Number of Darts Inside of a Circular Dartboard	Code	[Geometry]
1454	Active Users	Code
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Code	[String]
1456	Maximum Number of Vowels in a Substring of Given Length	Code	[String, Sliding Window]
1457	Pseudo-Palindromic Paths in a Binary Tree	Code	[Bit Manipulation, Tree, Depth-first Search]
1458	Max Dot Product of Two Subsequences	Code	[Dynamic Programming]
1459	Rectangles Area	Code
1460	Make Two Arrays Equal by Reversing Sub-arrays	Code	[Array]
1461	Check If a String Contains All Binary Codes of Size K	Code	[String, Bit Manipulation]
1462	Course Schedule IV	Code	[Graph]
1463	Cherry Pickup II	Code	[Dynamic Programming]
1464	Maximum Product of Two Elements in an Array	Code	[Array]
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Code	[Array]
1466	Reorder Routes to Make All Paths Lead to the City Zero	Code	[Tree, Depth-first Search]
1467	Probability of a Two Boxes Having The Same Number of Distinct Balls	Code	[Math, Backtracking]
1468	Calculate Salaries	Code
1469	Find All The Lonely Nodes	Code	[Tree, Depth-first Search]
1470	Shuffle the Array	Code	[Array]
1471	The k Strongest Values in an Array	Code	[Array, Sort]
1472	Design Browser History	Code	[Design]
1473	Paint House III	Code	[Dynamic Programming]
1474	Delete N Nodes After M Nodes of a Linked List	Code	[Linked List]
1475	Final Prices With a Special Discount in a Shop	Code	[Array]
1476	Subrectangle Queries	Code	[Array]
1477	Find Two Non-overlapping Sub-arrays Each With Target Sum	Code	[Dynamic Programming]
1478	Allocate Mailboxes	Code	[Math, Dynamic Programming]
1479	Sales by Day of the Week	Code
1480	Running Sum of 1d Array	Code	[Array]
1481	Least Number of Unique Integers after K Removals	Code	[Array, Sort]
1482	Minimum Number of Days to Make m Bouquets	Code	[Array, Binary Search]
1483	Kth Ancestor of a Tree Node	Code	[Dynamic Programming]
1484	Group Sold Products By The Date	Code
1485	Clone Binary Tree With Random Pointer	Code	[Hash Table, Tree, Depth-first Search, Breadth-first Search]
1486	XOR Operation in an Array	Code	[Array, Bit Manipulation]
1487	Making File Names Unique	Code	[Hash Table, String]
1488	Avoid Flood in The City	Code	[Array, Hash Table]
1489	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Code	[Depth-first Search, Union Find]
1490	Clone N-ary Tree	Code	[Hash Table, Tree, Depth-first Search, Breadth-first Search]
1491	Average Salary Excluding the Minimum and Maximum Salary	Code	[Array, Sort]
1492	The kth Factor of n	Code	[Math]
1493	Longest Subarray of 1’s After Deleting One Element	Code	[Array]
1494	Parallel Courses II	Code	[Graph]
1495	Friendly Movies Streamed Last Month	Code
1496	Path Crossing	Code	[String]
1497	Check If Array Pairs Are Divisible by k	Code	[Array, Math, Greedy]
1498	Number of Subsequences That Satisfy the Given Sum Condition	Code	[Sort, Sliding Window]
1499	Max Value of Equation	Code	[Array, Sliding Window]
1500	Design a File Sharing System	Code	[Array, Design]
1501	Countries You Can Safely Invest In	Code
1502	Can Make Arithmetic Progression From Sequence	Code	[Array, Sort]
1503	Last Moment Before All Ants Fall Out of a Plank	Code	[Array, Brainteaser]
1504	Count Submatrices With All Ones	Code	[Dynamic Programming]
1505	Minimum Possible Integer After at Most K Adjacent Swaps On Digits	Code	[Greedy]
1506	Find Root of N-Ary Tree	Code
1507	Reformat Date	Code	[String]
1508	Range Sum of Sorted Subarray Sums	Code	[Array, Sort]
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Code	[Array, Sort]
1510	Stone Game IV	Code	[Dynamic Programming]
1511	Customer Order Frequency	Code
1512	Number of Good Pairs	Code	[Array, Hash Table, Math]
1513	Number of Substrings With Only 1s	Code	[Math, String]
1514	Path with Maximum Probability	Code	[Graph]
1515	Best Position for a Service Centre	Code	[Geometry]
1516	Move Sub-Tree of N-Ary Tree	Code	[Tree]
1517	Find Users With Valid E-Mails	Code
1518	Water Bottles	Code	[Greedy]
1519	Number of Nodes in the Sub-Tree With the Same Label	Code	[Depth-first Search, Breadth-first Search]
1520	Maximum Number of Non-Overlapping Substrings	Code	[Greedy]
1521	Find a Value of a Mysterious Function Closest to Target	Code	[Binary Search, Bit Manipulation, Segment Tree]
1522	Diameter of N-Ary Tree	Code
1523	Count Odd Numbers in an Interval Range	Code	[Math]
1524	Number of Sub-arrays With Odd Sum	Code	[Array, Math]
1525	Number of Good Ways to Split a String	Code	[String, Bit Manipulation]
1526	Minimum Number of Increments on Subarrays to Form a Target Array	Code	[Segment Tree]
1527	Patients With a Condition	Code
1528	Shuffle String	Code	[Sort]
1529	Bulb Switcher IV	Code	[String]
1530	Number of Good Leaf Nodes Pairs	Code	[Tree, Depth-first Search]
1531	String Compression II	Code	[String, Dynamic Programming]
1532	The Most Recent Three Orders	Code
1533	Find the Index of the Large Integer	Code	[Binary Search]
1534	Count Good Triplets	Code	[Array]
1535	Find the Winner of an Array Game	Code	[Array]
1536	Minimum Swaps to Arrange a Binary Grid	Code	[Greedy]
1537	Get the Maximum Score	Code	[Dynamic Programming]
1538	Guess the Majority in a Hidden Array	Code
1539	Kth Missing Positive Number	Code	[Array, Hash Table]
1540	Can Convert String in K Moves	Code	[String, Greedy]
1541	Minimum Insertions to Balance a Parentheses String	Code	[String, Stack]
1542	Find Longest Awesome Substring	Code	[String, Bit Manipulation]
1543	Fix Product Name Format	Code
1544	Make The String Great	Code	[String, Stack]
1545	Find Kth Bit in Nth Binary String	Code	[String]
1546	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target	Code	[Dynamic Programming]
1547	Minimum Cost to Cut a Stick	Code	[Dynamic Programming]
1548	The Most Similar Path in a Graph	Code	[Dynamic Programming, Graph]
1549	The Most Recent Orders for Each Product	Code
1550	Three Consecutive Odds	Code	[Array]
1551	Minimum Operations to Make Array Equal	Code	[Math]
1552	Magnetic Force Between Two Balls	Code	[Array, Binary Search]
1553	Minimum Number of Days to Eat N Oranges	Code	[Dynamic Programming]
1554	Strings Differ by One Character	Code
1555	Bank Account Summary	Code
1556	Thousand Separator	Code	[String]
1557	Minimum Number of Vertices to Reach All Nodes	Code	[Graph]
1558	Minimum Numbers of Function Calls to Make Target Array	Code	[Greedy]
1559	Detect Cycles in 2D Grid	Code	[Depth-first Search]
1560	Most Visited Sector in a Circular Track	Code	[Array]
1561	Maximum Number of Coins You Can Get	Code	[Sort]
1562	Find Latest Group of Size M	Code	[Binary Search]
1563	Stone Game V	Code	[Dynamic Programming]
1564	Put Boxes Into the Warehouse I	Code	[Greedy]
1565	Unique Orders and Customers Per Month	Code
1566	Detect Pattern of Length M Repeated K or More Times	Code	[Array]
1567	Maximum Length of Subarray With Positive Product	Code	[Greedy]
1568	Minimum Number of Days to Disconnect Island	Code	[Greedy]
1569	Number of Ways to Reorder Array to Get Same BST	Code	[Dynamic Programming]
1570	Dot Product of Two Sparse Vectors	Code	[Array, Hash Table, Two Pointers]
1571	Warehouse Manager	Code
1572	Matrix Diagonal Sum	Code	[Array]
1573	Number of Ways to Split a String	Code	[String]
1574	Shortest Subarray to be Removed to Make Array Sorted	Code	[Array, Binary Search]
1575	Count All Possible Routes	Code	[Dynamic Programming]
1576	Replace All ?’s to Avoid Consecutive Repeating Characters	Code	[String]
1577	Number of Ways Where Square of Number Is Equal to Product of Two Numbers	Code	[Hash Table, Math]
1578	Minimum Deletion Cost to Avoid Repeating Letters	Code	[Greedy]
1579	Remove Max Number of Edges to Keep Graph Fully Traversable	Code	[Union Find]
1580	Put Boxes Into the Warehouse II	Code	[Greedy]
1581	Customer Who Visited but Did Not Make Any Transactions	Code
1582	Special Positions in a Binary Matrix	Code	[Array]
1583	Count Unhappy Friends	Code	[Array]
1584	Min Cost to Connect All Points	Code	[Union Find]
1585	Check If String Is Transformable With Substring Sort Operations	Code	[String, Greedy]
1586	Binary Search Tree Iterator II	Code	[Tree, Design]
1587	Bank Account Summary II	Code
1588	Sum of All Odd Length Subarrays	Code	[Array]
1589	Maximum Sum Obtained of Any Permutation	Code	[Greedy]
1590	Make Sum Divisible by P	Code	[Array, Hash Table, Math, Binary Search]
1591	Strange Printer II	Code	[Greedy]
1592	Rearrange Spaces Between Words	Code	[String]
1593	Split a String Into the Max Number of Unique Substrings	Code	[Backtracking]
1594	Maximum Non Negative Product in a Matrix	Code	[Dynamic Programming, Greedy]
1595	Minimum Cost to Connect Two Groups of Points	Code	[Dynamic Programming, Graph]
1596	The Most Frequently Ordered Products for Each Customer	Code
1597	Build Binary Expression Tree From Infix Expression	Code	[String, Tree]
1598	Crawler Log Folder	Code	[Stack]
1599	Maximum Profit of Operating a Centennial Wheel	Code	[Greedy]
1600	Throne Inheritance	Code	[Tree, Design]
1601	Maximum Number of Achievable Transfer Requests	Code	[Dynamic Programming]
1602	Find Nearest Right Node in Binary Tree	Code	[Tree, Breadth-first Search]
1603	Design Parking System	Code	[Design]
1604	Alert Using Same Key-Card Three or More Times in a One Hour Period	Code	[String, Ordered Map]
1605	Find Valid Matrix Given Row and Column Sums	Code	[Greedy]
1606	Find Servers That Handled Most Number of Requests	Code	[Ordered Map]
1607	Sellers With No Sales	Code
1608	Special Array With X Elements Greater Than or Equal X	Code	[Array]
1609	Even Odd Tree	Code	[Tree]
1610	Maximum Number of Visible Points	Code	[Two Pointers, Geometry]
1611	Minimum One Bit Operations to Make Integers Zero	Code	[Dynamic Programming, Bit Manipulation]
1612	Check If Two Expression Trees are Equivalent	Code	[Hash Table, Tree]
1613	Find the Missing IDs	Code
1614	Maximum Nesting Depth of the Parentheses	Code	[String]
1615	Maximal Network Rank	Code	[Graph]
1616	Split Two Strings to Make Palindrome	Code	[Two Pointers, String, Greedy]
1617	Count Subtrees With Max Distance Between Cities	Code	[Backtracking]
1618	Maximum Font to Fit a Sentence in a Screen	Code	[String, Binary Search]
1619	Mean of Array After Removing Some Elements	Code	[Array]
1620	Coordinate With Maximum Network Quality	Code	[Greedy]
1621	Number of Sets of K Non-Overlapping Line Segments	Code	[Dynamic Programming]
1622	Fancy Sequence	Code	[Math, Design]
1623	All Valid Triplets That Can Represent a Country	Code
1624	Largest Substring Between Two Equal Characters	Code	[String]
1625	Lexicographically Smallest String After Applying Operations	Code	[Depth-first Search, Breadth-first Search]
1626	Best Team With No Conflicts	Code	[Dynamic Programming]
1627	Graph Connectivity With Threshold	Code	[Math, Union Find]
1628	Design an Expression Tree With Evaluate Function	Code	[Tree, Design, OOP]
1629	Slowest Key	Code	[Array]
1630	Arithmetic Subarrays	Code	[Sort]
1631	Path With Minimum Effort	Code	[Binary Search, Depth-first Search, Union Find, Graph]
1632	Rank Transform of a Matrix	Code	[Greedy, Union Find]
1633	Percentage of Users Attended a Contest	Code
1634	Add Two Polynomials Represented as Linked Lists	Code	[Linked List]
1635	Hopper Company Queries I	Code
1636	Sort Array by Increasing Frequency	Code	[Array, Sort]
1637	Widest Vertical Area Between Two Points Containing No Points	Code	[Sort]
1638	Count Substrings That Differ by One Character	Code	[Hash Table, String, Trie, Rolling Hash]
1639	Number of Ways to Form a Target String Given a Dictionary	Code	[Dynamic Programming]
1640	Check Array Formation Through Concatenation	Code	[Array, Sort]
1641	Count Sorted Vowel Strings	Code	[Math, Dynamic Programming, Backtracking]
1642	Furthest Building You Can Reach	Code	[Binary Search, Heap]
1643	Kth Smallest Instructions	Code	[Dynamic Programming]
1644	Lowest Common Ancestor of a Binary Tree II	Code	[Tree]
1645	Hopper Company Queries II	Code
1646	Get Maximum in Generated Array	Code	[Array]
1647	Minimum Deletions to Make Character Frequencies Unique	Code	[Greedy, Sort]
1648	Sell Diminishing-Valued Colored Balls	Code	[Math, Greedy, Sort]
1649	Create Sorted Array through Instructions	Code	[Binary Indexed Tree, Segment Tree, Ordered Map]
1650	Lowest Common Ancestor of a Binary Tree III	Code	[Tree]
1651	Hopper Company Queries III	Code
1652	Defuse the Bomb	Code	[Array]
1653	Minimum Deletions to Make String Balanced	Code	[String, Greedy]
1654	Minimum Jumps to Reach Home	Code	[Dynamic Programming, Breadth-first Search]
1655	Distribute Repeating Integers	Code	[Dynamic Programming, Backtracking]
1656	Design an Ordered Stream	Code	[Array, Design]
1657	Determine if Two Strings Are Close	Code	[Greedy]
1658	Minimum Operations to Reduce X to Zero	Code	[Two Pointers, Binary Search, Greedy]
1659	Maximize Grid Happiness	Code	[Dynamic Programming, Backtracking]
1660	Correct a Binary Tree	Code	[Tree]
1661	Average Time of Process per Machine	Code
1662	Check If Two String Arrays are Equivalent	Code	[String]
1663	Smallest String With A Given Numeric Value	Code	[Greedy]
1664	Ways to Make a Fair Array	Code	[Dynamic Programming, Greedy]
1665	Minimum Initial Energy to Finish Tasks	Code	[Greedy]
1666	Change the Root of a Binary Tree	Code	[Tree, Depth-first Search]
1667	Fix Names in a Table	Code
1668	Maximum Repeating Substring	Code	[String]
1669	Merge In Between Linked Lists	Code	[Linked List]
1670	Design Front Middle Back Queue	Code	[Linked List, Design, Dequeue]
1671	Minimum Number of Removals to Make Mountain Array	Code	[Dynamic Programming]
1672	Richest Customer Wealth	Code	[Array]
1673	Find the Most Competitive Subsequence	Code	[Stack, Greedy]
1674	Minimum Moves to Make Array Complementary	Code	[Greedy]
1675	Minimize Deviation in Array	Code	[Heap, Ordered Map]
1676	Lowest Common Ancestor of a Binary Tree IV	Code	[Tree, Depth-first Search]
1677	Product’s Worth Over Invoices	Code
1678	Goal Parser Interpretation	Code	[String]
1679	Max Number of K-Sum Pairs	Code	[Hash Table]
1680	Concatenation of Consecutive Binary Numbers	Code	[Math]
1681	Minimum Incompatibility	Code	[Backtracking, Greedy]
1682	Longest Palindromic Subsequence II	Code	[String, Dynamic Programming]
1683	Invalid Tweets	Code
1684	Count the Number of Consistent Strings	Code	[String]
1685	Sum of Absolute Differences in a Sorted Array	Code	[Math, Greedy]
1686	Stone Game VI	Code	[Greedy]
1687	Delivering Boxes from Storage to Ports	Code	[Two Pointers, Dynamic Programming, Segment Tree, Dequeue]
1688	Count of Matches in Tournament	Code	[Backtracking]
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Code	[Greedy]
1690	Stone Game VII	Code	[Dynamic Programming]
1691	Maximum Height by Stacking Cuboids	Code	[Dynamic Programming, Sort]
1692	Count Ways to Distribute Candies	Code	[Dynamic Programming]
1693	Daily Leads and Partners	Code
1694	Reformat Phone Number	Code	[String]
1695	Maximum Erasure Value	Code	[Two Pointers]
1696	Jump Game VI	Code	[Dequeue]
1697	Checking Existence of Edge Length Limited Paths	Code	[Sort, Union Find]
1698	Number of Distinct Substrings in a String	Code	[String, Trie, Rolling Hash, Suffix Array]
1699	Number of Calls Between Two Persons	Code
1700	Number of Students Unable to Eat Lunch	Code	[Array]
1701	Average Waiting Time	Code	[Array]
1702	Maximum Binary String After Change	Code	[Greedy]
1703	Minimum Adjacent Swaps for K Consecutive Ones	Code	[Stack]
1704	Determine if String Halves Are Alike	Code	[String]
1705	Maximum Number of Eaten Apples	Code	[Heap, Greedy]
1706	Where Will the Ball Fall	Code	[Dynamic Programming]
1707	Maximum XOR With an Element From Array	Code	[Bit Manipulation, Trie]

Data structures and Algorithms

Leet Code All problems