LeetCode

Solutions for LeetCode problems written in Golang.

#	Question	Difficulty	Solution	Runtime	Memory
468	Validate IP Address	Medium	Code	0 ms	2.0 MB
467	Unique Substrings in Wraparound String	Medium	Code	0 ms	2.7 MB
466	Count The Repetitions	Hard	Code	2152 ms	1.9 MB
464	Can I Win	Medium	Code	8 ms	12.8 MB
463	Island Perimeter	Easy	Code	56 ms	6.5 MB
462	Minimum Moves to Equal Array Elements II	Medium	Code	8 ms	4.5 MB
461	Hamming Distance	Hard	Code	0 ms	2.0 MB
460	LFU Cache	Hard	Code	136 ms	16.8 MB
459	Repeated Substring Pattern	Easy	Code	4 ms	6.0 MB
458	Poor Pigs	Hard	Code	0 ms	1.9 MB
457	Circular Array Loop	Medium	Code	0 ms	2.0 MB
456	132 Pattern	Medium	Code	8 ms	5.6 MB
455	Assign Cookies	Easy	Code	32 ms	6.0 MB
454	4Sum II	Medium	Code	52 ms	18.5 MB
453	Minimum Moves to Equal Array Elements	Easy	Code	32 ms	6.4 MB
452	Minimum Number of Arrows to Burst Balloons	Medium	Code	72 ms	6.9 MB
451	Sort Characters By Frequency	Medium	Code	4 ms	4.8 MB
450	Delete Node in a BST	Medium	Code	348 ms	121.3 MB
449	Serialize and Deserialize BST	Medium	Code	180 ms	57.9 MB
448	Find All Numbers Disappeared in an Array	Easy	Code	52 ms	6.9 MB
447	Number of Boomerangs	Medium	Code	180 ms	6.6 MB
445	Add Two Numbers II	Medium	Code	8 ms	6.1 MB
443	String Compression	Medium	Code	4 ms	2.9 MB
442	Find All Duplicates in an Array	Medium	Code	52 ms	6.9 MB
441	Arranging Coins	Easy	Code	4 ms	2.3 MB
438	Find All Anagrams in a String	Medium	Code	0 ms	5.1 MB
437	Path Sum III	Medium	Code	4 ms	5.0 MB
436	Find Right Interval	Medium	Code	40 ms	6.7 MB
435	Non-overlapping Intervals	Medium	Code	4 ms	4.1 MB
434	Number of Segments in a String	Easy	Code	0 ms	1.9 MB
433	Minimum Genetic Mutation	Medium	Code	0 ms	1.9 MB
432	All O`one Data Structure	Hard	Code	44 ms	14.0 MB
430	Flatten a Multilevel Doubly Linked List	Medium	Code	0 ms	2.7 MB
429	N-ary Tree Level Order Traversal	Medium	Code	0 ms	4.2 MB
427	Construct Quad Tree	Medium	Code	8 ms	6.1 MB
424	Longest Repeating Character Replacement	Medium	Code	0 ms	2.6 MB
423	Reconstruct Original Digits from English	Medium	Code	0 ms	5.1 MB
421	Maximum XOR of Two Numbers in an Array	Medium	Code	88 ms	6.8 MB
419	Battleships in a Board	Medium	Code	0 ms	2.4 MB
417	Pacific Atlantic Water Flow	Medium	Code	32 ms	6.3 MB
416	Partition Equal Subset Sum	Medium	Code	8 ms	2.5 MB
415	Add Strings	Easy	Code	0 ms	2.5 MB
414	Third Maximum Number	Easy	Code	0 ms	3.0 MB
413	Arithmetic Slices	Medium	Code	0 ms	2.2 MB
412	Fizz Buzz	Easy	Code	4 ms	4.1 MB
410	Split Array Largest Sum	Hard	Code	0 ms	2.1 MB
409	Longest Palindrome	Easy	Code	0 ms	2.1 MB
406	Queue Reconstruction by Height	Medium	Code	16 ms	5.9 MB
405	Convert a Number to Hexadecimal	Easy	Code	0 ms	1.9 MB
404	Sum of Left Leaves	Easy	Code	0 ms	2.7 MB
403	Frog Jump	Hard	Code	64 ms	6.9 MB
402	Remove K Digits	Medium	Code	0 ms	2.5 MB
401	Binary Watch	Easy	Code	0 ms	2.0 MB
400	Nth Digit	Medium	Code	0 ms	2.0 MB
399	Evaluate Division	Medium	Code	0 ms	2.1 MB
398	Random Pick Index	Medium	Code	96 ms	7.9 MB
397	Integer Replacement	Medium	Code	9 ms	1.9 MB
396	Rotate Function	Medium	Code	4 ms	3.9 MB
395	Longest Substring with At Least K Repeating Characters	Medium	Code	0 ms	3.3 MB
394	Decode String	Medium	Code	0 ms	2.0 MB
393	UTF-8 Validation	Medium	Code	8 ms	5.4 MB
392	Is Subsequence	Easy	Code	0 ms	2.0 MB
390	Elimination Game	Easy	Code	0 ms	2.8 MB
389	Find the Difference	Easy	Code	0 ms	2.2 MB
388	Longest Absolute File Path	Medium	Code	0 ms	2.0 MB
387	First Unique Character in a String	Easy	Code	8 ms	5.7 MB
386	Lexicographical Numbers	Medium	Code	8 ms	6.3 MB
385	Mini Parser	Medium	Code	4 ms	5.1 MB
384	Shuffle an Array	Medium	Code	52 ms	8.8 MB
383	Ransom Note	Easy	Code	4 ms	4.3 MB
382	Linked List Random Node	Medium	Code	12 ms	7.1 MB
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Code	28 ms	7.7 MB
380	Insert Delete GetRandom O(1)	Medium	Code	28 ms	7.6 MB
378	Kth Smallest Element in a Sorted Matrix	Medium	Code	20 ms	6.3 MB
377	Combination Sum IV	Medium	Code	0 ms	2.1 MB
376	Wiggle Subsequence	Medium	Code	0 ms	2.1 MB
375	Guess Number Higher or Lower II	Medium	Code	12 ms	4.7 MB
374	Guess Number Higher or Lower	Easy	Code	0 ms	1.9 MB
373	Find K Pairs with Smallest Sums	Medium	Code	4 ms	4.0 MB
372	Super Pow	Medium	Code	12 ms	3.9 MB
371	Sum of Two Integers	Medium	Code	0 ms	2.0 MB
368	Largest Divisible Subset	Medium	Code	44 ms	5.1 MB
367	Valid Perfect Square	Easy	Code	0 ms	1.9 MB
365	Water and Jug Problem	Hard	Code	0 ms	1.9 MB
363	Max Sum of Rectangle No Larger Than K	Hard	Code	28 ms	4.5 MB
357	Count Numbers with Unique Digits	Medium	Code	0 ms	1.9 MB
355	Design Twitter	Medium	Code	44 ms	11.5 MB
354	Russian Doll Envelopes	Hard	Code	24 ms	6.2 MB
352	Data Stream as Disjoint Intervals	Hard	Code	36 ms	16.9 MB
350	Intersection of Two Arrays I	Easy	Code	0 ms	2.9 MB
349	Intersection of Two Arrays	Easy	Code	4 ms	3.0 MB
347	Top K Frequent Elements	Medium	Code	12 ms	5.8 MB
345	Reverse Vowels of a String	Easy	Code	0 ms	4.0 MB
344	Reverse String	Easy	Code	32 ms	6.3 MB
343	Integer Break	Medium	Code	0 ms	1.9 MB
342	Power of Four	Medium	Code	0 ms	2.1 MB
341	Flatten Nested List Iterator	Medium	Code	4 ms	5.2 MB
338	Counting Bits	Medium	Code	4 ms	4.4 MB
337	House Robber III	Medium	Code	4 ms	5.2 MB
336	Palindrome Pairs	Hard	Code	132 ms	10.8 MB
335	Self Crossing	Hard	Code	0 ms	2.0 MB
334	Increasing Triplet Subsequence	Medium	Code	4 ms	3.0 MB
332	Reconstruct Itinerary	Medium	Code	8 ms	6.0 MB
331	Verify Preorder Serialization of a Binary Tree	Medium	Code	0 ms	2.7 MB
330	Patching Array	Hard	Code	4 ms	3.4 MB
329	Longest Increasing Path in a Matrix	Hard	Code	32 ms	6.3 MB
328	Odd Even Linked List	Medium	Code	4 ms	3.3 MB
327	Count of Range Sum	Hard	Code	12 ms	6.1 MB
326	Power of Three	Easy	Code	16 ms	6.1 MB
324	Wiggle Sort II	Medium	Code	20 ms	6.2 MB
322	Coin Change	Medium	Code	28 ms	6.2 MB
321	Create Maximum Number	Hard	Code	8 ms	6.5 MB
319	Bulb Switcher	Medium	Code	0 ms	1.9 MB
318	Maximum Product of Word Lengths	Medium	Code	8 ms	6.0 MB
316	Remove Duplicate Letters	Hard	Code	0 ms	2.1 MB
315	Count of Smaller Numbers After Self	Hard	Code	8 ms	6.4 MB
313	Super Ugly Number	Medium	Code	8 ms	3.1 MB
312	Burst Balloons	Hard	Code	4 ms	2.9 MB
310	Minimum Height Trees	Medium	Code	36 ms	7.3 MB
309	Best Time to Buy and Sell Stock with Cooldown	Medium	Code	0 ms	2.4 MB
307	Range Sum Query - Mutable	Medium	Code	60 ms	8.8 MB
306	Additive Number	Medium	Code	0 ms	1.9 MB
304	Range Sum Query 2D - Immutable	Medium	Code	36 ms	8.2 MB
303	Range Sum Query - Immutable	Easy	Code	28 ms	8.3 MB
301	Remove Invalid Parentheses	Hard	Code	0 ms	2.4 MB
300	Longest Increasing Subsequence	Medium	Code	0 ms	2.4 MB
299	Bulls and Cows	Easy	Code	0 ms	2.2 MB
297	Serialize and Deserialize Binary Tree	Hard	Code	228 ms	183.3 MB
295	Find Median from Data Stream	Hard	Code	104 ms	16.3 MB
292	Nim Game	Easy	Code	0 ms	2.0 MB
290	Word Pattern	Easy	Code	0 ms	2.0 MB
289	Game of Life	Medium	Code	0 ms	2.0 MB
287	Find the Duplicate Number	Medium	Code	4 ms	3.8 MB
284	Peeking Iterator	Medium	Code	0 ms	2.5 MB
283	Move Zeroes	Easy	Code	4 ms	3.8 MB
282	Expression Add Operators	Hard	Code	12 ms	3.5 MB
279	Perfect Squares	Medium	Code	36 ms	5.8 MB
278	First Bad Version	Easy	Code	0 ms	1.9 MB
275	H-Index II	Medium	Code	12 ms	6.2 MB
274	H-Index	Medium	Code	0 ms	2.3 MB
273	Integer to English Words	Hard	Code	0 ms	6.1 MB
268	Missing Number	Easy	Code	16 ms	6.0 MB
264	Ugly Number II	Medium	Code	0 ms	4.1 MB
263	Ugly Number	Easy	Code	0 ms	2.1 MB
260	Single Number III	Medium	Code	4 ms	4.2 MB
258	Add Digits	Easy	Code	0 ms	2.2 MB
257	Binary Tree Paths	Easy	Code	0 ms	2.3 MB
242	Valid Anagram	Easy	Code	0 ms	3.0 MB
241	Different Ways to Add Parentheses	Medium	Code	0 ms	2.4 MB
240	Search a 2D Matrix II	Medium	Code	20 ms	6.2 MB
239	Sliding Window Maximum	Hard	Code	40 ms	7.2 MB
238	Product of Array Except Self	Medium	Code	0 ms	2.9 MB
237	Delete Node in a Linked List	Easy	Code	0 ms	2.9 MB
236	Lowest Common Ancestor of a Binary Tree	Medium	Code	20 ms	7.8 MB
235	Lowest Common Ancestor of a Binary Search Tree	Easy	Code	20 ms	6.8 MB
234	Palindrome Linked List	Easy	Code	12 ms	6.1 MB
233	Number of Digit One	Hard	Code	0 ms	2.1 MB
232	Implement Queue using Stacks	Easy	Code	0 ms	2.0 MB
231	Power of Two	Easy	Code	0 ms	2.2 MB
230	Kth Smallest Element in a BST	Medium	Code	6 ms	6.0 MB
229	Majority Element II	Medium	Code	12 ms	5.1 MB
228	Summary Ranges	Medium	Code	0 ms	2.0 MB
227	Basic Calculator II	Medium	Code	0 ms	3.0 MB
226	Invert Binary Tree	Easy	Code	0 ms	2.2 MB
225	Implement Stack using Queues	Easy	Code	0 ms	2.0 MB
224	Basic Calculator	Hard	Code	0 ms	3.2 MB
223	Rectangle Area	Medium	Code	12 ms	6.1 MB
222	Count Complete Tree Nodes	Medium	Code	16 ms	6.4 MB
221	Maximal Square	Medium	Code	0 ms	3.5 MB
220	Contains Duplicate III	Medium	Code	4 ms	4.1 MB
219	Contains Duplicate II	Easy	Code	12 ms	6.5 MB
218	The Skyline Problem	Hard	Code	24 ms	6.5 MB
217	Contains Duplicate	Easy	Code	20 ms	7.4 MB
216	Combination Sum III	Medium	Code	0 ms	2.1 MB
215	Kth Largest Element in an Array	Medium	Code	8 ms	3.6 MB
214	Shortest Palindrome	Hard	Code	0 ms	3.3 MB
213	House Robber II	Medium	Code	0 ms	2.1 MB
212	Word Search II	Hard	Code	28 ms	14.8 MB
211	Add and Search Word - Data structure design	Medium	Code	88 ms	14.6 MB
210	Course Schedule II	Medium	Code	16 ms	6.3 MB
209	Minimum Size Subarray Sum	Medium	Code	8 ms	3.9 MB
208	Implement Trie (Prefix Tree)	Medium	Code	48 ms	15.9 MB
207	Course Schedule	Medium	Code	16 ms	5.9 MB
206	Reverse Linked List	Easy	Code	0 ms	2.6 MB
205	Isomorphic Strings	Easy	Code	0 ms	2.7 MB
204	Count Primes	Easy	Code	4 ms	4.9 MB
203	Remove Linked List Elements	Easy	Code	8 ms	4.7 MB
202	Happy Number	Easy	Code	0 ms	2.1 MB
201	Bitwise AND of Numbers Range	Medium	Code	8 ms	6.1 MB
200	Number of Islands	Medium	Code	0 ms	2.2 MB
199	Binary Tree Right Side View	Medium	Code	0 ms	2.2 MB
198	House Robber	Easy	Code	0 ms	2.0 MB
191	Number of 1 Bits	Easy	Code	0 ms	2.0 MB
190	Reverse Bits	Easy	Code	0 ms	2.5 MB
189	Rotate Array	Easy	Code	4 ms	3.2 MB
188	Best Time to Buy and Sell Stock IV	Hard	Code	4 ms	3.8 MB
187	Repeated DNA Sequences	Medium	Code	4 ms	7.2 MB
179	Largest Number	Medium	Code	4 ms	2.7 MB
174	Dungeon Game	Hard	Code	4 ms	3.4 MB
173	Binary Search Tree Iterator	Medium	Code	40 ms	12.6 MB
172	Factorial Trailing Zeroes	Easy	Code	0 ms	2.0 MB
171	Excel Sheet Column Number	Easy	Code	0 ms	2.2 MB
169	Majority Element	Easy	Code	16 ms	6.0 MB
168	Excel Sheet Column Title	Easy	Code	0 ms	2.0 MB
167	Two Sum II - Input array is sorted	Easy	Code	4 ms	3.0 MB
166	Fraction to Recurring Decimal	Medium	Code	0 ms	2.1 MB
165	Compare Version Numbers	Medium	Code	0 ms	2.0 MB
164	Maximum Gap	Hard	Code	4 ms	3.4 MB
162	Find Peak Element	Easy	Code	0 ms	2.8 MB
160	Intersection of Two Linked Lists	Easy	Code	36 ms	8.4 MB
155	Min Stack	Easy	Code	16 ms	7.8 MB
154	Find Minimum in Rotated Sorted Array II	Hard	Code	4 ms	3.1 MB
153	Find Minimum in Rotated Sorted Array	Medium	Code	0 ms	2.5 MB
152	Maximum Product Subarray	Medium	Code	0 ms	2.7 MB
151	Reverse Words in a String	Medium	Code	0 ms	3.4 MB
150	Evaluate Reverse Polish Notation	Medium	Code	4 ms	4.2 MB
149	Max Points on a Line	Hard	Code	56 ms	6.8 MB
148	Insertion Sort List	Medium	Code	12 ms	5.1 MB
147	Insertion Sort List	Medium	Code	4 ms	3.3 MB
146	LRU Cache	Medium	Code	108 ms	16.8 MB
145	Binary Tree Postorder Traversal	Hard	Code	0 ms	2.0 MB
144	Binary Tree Preorder Traversal	Medium	Code	0 ms	2.0 MB
143	Reorder List	Medium	Code	8 ms	5.4 MB
142	Linked List Cycle II	Medium	Code	4 ms	3.8 MB
141	Linked List Cycle	Easy	Code	4 ms	3.8 MB
140	Word Break II	Hard	Code	4 ms	2.6 MB
139	Word Break	Medium	Code	0 ms	2.1 MB
138	Copy List with Random Pointer	Medium	Code	0 ms	3.4 MB
137	Single Number II	Medium	Code	4 ms	3.6 MB
136	Single Number	Easy	Code	8 ms	4.7 MB
135	Candy	Hard	Code	16 ms	6.0 MB
134	Gas Station	Medium	Code	4 ms	3.0 MB
133	Clone Graph	Medium	Code	0 ms	2.7 MB
132	Palindrome Partitioning II	Hard	Code	8 ms	5.2 MB
131	Palindrome Partitioning	Medium	Code	12 ms	6.5 MB
130	Surrounded Regions	Medium	Code	24 ms	6.0 MB
129	Sum Root to Leaf Numbers	Medium	Code	0 ms	2.4 MB
128	Longest Consecutive Sequence	Hard	Code	4 ms	3.9 MB
127	Word Ladder	Medium	Code	52 ms	7.6 MB
126	Word Ladder II	Hard	Code	48 ms	6.4 MB
125	Valid Palindrome	Easy	Code	0 ms	2.7 MB
124	Binary Tree Maximum Path Sum	Hard	Code	16 ms	6.7 MB
123	Best Time to Buy and Sell Stock III	Hard	Code	4 ms	3.1 MB
122	Best Time to Buy and Sell Stock II	Easy	Code	4 ms	3.1 MB
121	Best Time to Buy and Sell Stock	Easy	Code	4 ms	3.1 MB
120	Triangle	Medium	Code	4 ms	3.1 MB
119	Pascal's Triangle II	Easy	Code	0 ms	2.0 MB
118	Pascal's Triangle	Easy	Code	0 ms	2.0 MB
117	Populating Next Right Pointers in Each Node II	Medium	Code	4 ms	5.9 MB
116	Populating Next Right Pointers in Each Node	Medium	Code	4 ms	6.1 MB
115	Distinct Subsequences	Hard	Code	0 ms	2.0 MB
114	Flatten Binary Tree to Linked List	Medium	Code	4 ms	6.9 MB
113	Path Sum II	Medium	Code	4 ms	4.4 MB
112	Path Sum	Easy	Code	4 ms	4.8 MB
111	Minimum Depth of Binary Tree	Easy	Code	4 ms	5.3 MB
110	Balanced Binary Tree	Easy	Code	4 ms	5.7 MB
109	Convert Sorted List to Binary Search Tree	Medium	Code	488 ms	154.6 MB
108	Convert Sorted Array to Binary Search Tree	Easy	Code	92 ms	185.1 MB
107	Binary Tree Level Order Traversal II	Easy	Code	0 ms	2.8 MB
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Code	20 ms	9.7 MB
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Code	16 ms	9.8 MB
104	Maximum Depth of Binary Tree	Easy	Code	4 ms	4.4 MB
103	Binary Tree Zigzag Level Order Traversal	Medium	Code	0 ms	2.5 MB
102	Binary Tree Level Order Traversal	Medium	Code	0 ms	2.8 MB
101	Symmetric Tree	Easy	Code	0 ms	2.9 MB
100	Same Tree	Easy	Code	0 ms	2.1 MB
99	Recover Binary Search Tree	Hard	Code	12 ms	8.1 MB
98	Validate Binary Search Tree	Medium	Code	4 ms	5.5 MB
97	Interleaving String	Hard	Code	0 ms	2.4 MB
96	Unique Binary Search Trees	Medium	Code	0 ms	1.9 MB
95	Unique Binary Search Trees II	Medium	Code	4 ms	5.2 MB
94	Binary Tree Inorder Traversal	Medium	Code	0 ms	2.0 MB
93	Restore IP Addresses	Medium	Code	0 ms	2.6 MB
92	Reverse Linked List II	Medium	Code	0 ms	2.1 MB
91	Decode Ways	Medium	Code	0 ms	2.0 MB
90	Subsets II	Medium	Code	0 ms	2.4 MB
89	Merge Sorted Array	Medium	Code	0 ms	2.2 MB
88	Merge Sorted Array	Easy	Code	0 ms	2.3 MB
87	Scramble String	Hard	Code	0 ms	2.1 MB
86	Partition List	Medium	Code	0 ms	2.4 MB
85	Maximal Rectangle	Hard	Code	0 ms	3.4 MB
84	Largest Rectangle in Histogram	Hard	Code	8 ms	4.4 MB
83	Remove Duplicates from Sorted List	Easy	Code	4 ms	3.1 MB
82	Remove Duplicates from Sorted List II	Medium	Code	4 ms	3.1 MB
81	Search in Rotated Sorted Array II	Medium	Code	4 ms	3.2 MB
80	Remove Duplicates from Sorted Array II	Medium	Code	4 ms	3.0 MB
79	Word Search	Medium	Code	4 ms	3.5 MB
78	Subsets	Medium	Code	0 ms	2.3 MB
77	Combinations	Medium	Code	4 ms	6.9 MB
76	Minimum Window Substring	Hard	Code	0 ms	3.0 MB
75	Sort Colors	Medium	Code	0 ms	2.1 MB
74	Search a 2D Matrix	Medium	Code	4 ms	3.8 MB
73	Set Matrix Zeroes	Medium	Code	12 ms	6.0 MB
72	Edit Distance	Hard	Code	0 ms	2.7 MB
71	Simplify Path	Medium	Code	0 ms	3.0 MB
70	Climb Stairs	Easy	Code	0 ms	2.0 MB
69	Sqrt(x)	Easy	Code	0 ms	2.2 MB
68	Text Justification	Hard	Code	0 ms	2.2 MB
67	Add Binary	Easy	Code	0 ms	2.6 MB
66	Plus One	Easy	Code	0 ms	2.0 MB
65	Valid Number	Hard	Code	0 ms	2.3 MB
64	Minimum Path Sum	Medium	Code	8 ms	3.9 MB
63	Unique Paths II	Medium	Code	0 ms	2.7 MB
62	Unique Paths	Medium	Code	0 ms	2.0 MB
61	Rotate List	Medium	Code	0 ms	2.5 MB
60	Permutation Sequence	Medium	Code	0 ms	2.0 MB
59	Spiral Matrix II	Medium	Code	0 ms	2.1 MB
58	Length of Last Word	Easy	Code	0 ms	2.1 MB
57	Insert Interval	Hard	Code	8 ms	4.8 MB
56	Merge Intervals	Medium	Code	4 ms	4.7 MB
55	Jump Game	Medium	Code	4 ms	4.2 MB
54	Spiral Matrix	Medium	Code	0 ms	2.0 MB
53	Maximum Subarray	Easy	Code	4 ms	3.3 MB
52	N-Queens II	Hard	Code	0 ms	1.9 MB
51	N-Queens	Hard	Code	0 ms	3.2 MB
50	Pow(x, n)	Medium	Code	0 ms	2.0 MB
49	Group Anagrams	Medium	Code	16 ms	6.8 MB
48	Rotate Image	Medium	Code	0 ms	2.2 MB
47	Permutations II	Medium	Code	0 ms	3.7 MB
46	Permutations	Medium	Code	0 ms	2.6 MB
45	Jump Game II	Hard	Code	4 ms	4.3 MB
44	Wildcard Matching	Hard	Code	0 ms	3.1 MB
43	Multiply Strings	Medium	Code	0 ms	2.2 MB
42	Trapping Rain Water	Hard	Code	0 ms	2.8 MB
41	First Missing Positive	Hard	Code	0 ms	2.2 MB
40	Combination Sum II	Medium	Code	0 ms	3.1 MB
39	Combination Sum	Medium	Code	0 ms	3.1 MB
38	Count and Say	Easy	Code	0 ms	2.1 MB
37	Sudoku Solver	Hard	Code	0 ms	2.1 MB
36	Valid Sudoku	Medium	Code	0 ms	2.8 MB
35	Search Insert Position	Easy	Code	0 ms	3.1 MB
34	Find First and Last Position of Element in Sorted Array	Medium	Code	8 ms	4.1 MB
33	Search in Rotated Sorted Array	Medium	Code	0 ms	2.6 MB
32	Longest Valid Parentheses	Hard	Code	0 ms	2.8 MB
31	Next Permutation	Medium	Code	0 ms	3.4 MB
30	Substring with Concatenation of All Words	Hard	Code	4 ms	3.2 MB
29	Divide Two Integers	Medium	Code	0 ms	2.4 MB
28	Implement strStr()	Easy	Code	0 ms	2.4 MB
27	Remove Element	Easy	Code	0 ms	2.4 MB
26	Remove Duplicates from Sorted Array	Easy	Code	44 ms	7.5 MB
25	Reverse Nodes in k-Group	Hard	Code	4 ms	3.7 MB
24	Swap Nodes in Pairs	Medium	Code	0 ms	2.1 MB
23	Merge k Sorted Lists	Hard	Code	4 ms	5.3 MB
22	Generate Parentheses	Medium	Code	4 ms	8.1 MB
21	Merge Two Sorted Lists	Easy	Code	0 ms	2.5 MB
20	Valid Parentheses	Easy	Code	0 ms	2.0 MB
19	Remove Nth Node From End of List	Medium	Code	0 ms	2.2 MB
18	4Sum	Medium	Code	8 ms	3.1 MB
17	Letter Combinations of a Phone Number	Medium	Code	0 ms	2.5 MB
16	3Sum Closest	Medium	Code	4 ms	2.7 MB
15	3Sum	Medium	Code	820 ms	174.0 MB
14	Longest Common Prefix	Easy	Code	0 ms	2.4 MB
13	Roman to Integer	Easy	Code	0 ms	3.0 MB
12	Integer to Roman	Medium	Code	4 ms	3.4 MB
11	Container With Most Water	Medium	Code	12 ms	5.6 MB
10	Regular Expression Matching	Hard	Code	0 ms	2.2 MB
9	Palindrome Number	Easy	Code	0 ms	5.0 MB
8	String to Integer (atoi)	Medium	Code	0 ms	2.3 MB
7	Reverse Integer	Easy	Code	0 ms	2.2 MB
6	ZigZag Conversion	Medium	Code	0 ms	4.2 MB
5	Longest Palindromic Substring	Medium	Code	0 ms	2.2 MB
4	Median of Two Sorted Arrays	Hard	Code	8 ms	5.5 MB
3	Longest Substring Without Repeating Characters	Medium	Code	0 ms	2.6 MB
2	Add Two Numbers	Medium	Code	8 ms	4.9 MB
1	Two Sum	Easy	Code	4 ms	3.7 MB