leetcode

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leetcode 题解

clone 本项目以及依赖的子模块（测试依赖gtest） git clone --recursive git://github.com/baishuai/leetcode.git

完成进度 479/641

#	Title	Solution	Difficulty	Finshed
727	Minimum Window Subsequence		Hard
726	Number of Atoms		Hard
725	Split Linked List in Parts		Medium
724	Find Pivot Index		Easy
723	Candy Crush		Medium
722	Remove Comments		Medium
721	Accounts Merge		Medium
720	Longest Word in Dictionary		Easy
719	Find K-th Smallest Pair Distance		Hard
718	Maximum Length of Repeated Subarray		Medium
717	1-bit and 2-bit Characters		Easy
716	Max Stack		Easy
715	Range Module	cpp	Hard	✔
714	Best Time to Buy and Sell Stock with Transaction Fee		Medium
713	Subarray Product Less Than K	cpp	Medium	✔
712	Minimum ASCII Delete Sum for Two Strings		Medium
711	Number of Distinct Islands II		Hard
699	Falling Squares		Hard
698	Partition to K Equal Sum Subsets	cpp	Medium	✔
697	Degree of an Array	cpp	Easy	✔
696	Count Binary Substrings		Easy
695	Max Area of Island		Easy
694	Number of Distinct Islands		Medium
693	Binary Number with Alternating Bits		Easy
692	Top K Frequent Words		Medium
691	Stickers to Spell Word		Hard
690	Employee Importance		Easy
689	Maximum Sum of 3 Non-Overlapping Subarrays		Hard
688	Knight Probability in Chessboard		Medium
687	Longest Univalue Path		Easy
686	Repeated String Match	cpp	Easy	✔
685	Redundant Connection II		Hard
684	Redundant Connection		Medium
683	K Empty Slots		Hard
682	Baseball Game	cpp	Easy	✔
681	Next Closest Time		Medium
680	Valid Palindrome II	cpp	Easy	✔
679	24 Game	cpp	Hard	✔
678	Valid Parenthesis String	cpp	Medium	✔
677	Map Sum Pairs	cpp	Medium	✔
676	Implement Magic Dictionary		Medium
675	Cut Off Trees for Golf Event		Hard
674	Longest Continuous Increasing Subsequence	cpp	Easy	✔
673	Number of Longest Increasing Subsequence		Medium
672	Bulb Switcher II	cpp	Medium	✔
671	Second Minimum Node In a Binary Tree		Easy
670	Maximum Swap	cpp	Medium	✔
669	Trim a Binary Search Tree	cpp	Easy	✔
668	Kth Smallest Number in Multiplication Table		Hard
667	Beautiful Arrangement II	cpp	Medium	✔
666	Path Sum IV		Medium
665	Non-decreasing Array	cpp	Easy	✔
664	Strange Printer		Hard
663	Equal Tree Partition		Medium
662	Maximum Width of Binary Tree	cpp	Medium	✔
661	Image Smoother	cpp	Easy	✔
660	Remove 9	cpp	Hard	✔
659	Split Array into Consecutive Subsequences	cpp	Medium	✔
658	Find K Closest Elements	cpp	Medium	✔
657	Judge Route Circle	cpp	Easy	✔
656	Coin Path		Hard
655	Print Binary Tree	cpp	Medium	✔
654	Maximum Binary Tree	cpp	Medium	✔
653	Two Sum IV - Input is a BST	cpp	Easy	✔
652	Find Duplicate Subtrees		Medium
651	4 Keys Keyboard		Medium
650	2 Keys Keyboard	cpp	Medium	✔
649	Dota2 Senate		Medium
648	Replace Words	Go	Medium	✔
647	Palindromic Substrings	cpp	Medium	✔
646	Maximum Length of Pair Chain	cpp	Medium	✔
645	Set Mismatch	cpp	Easy	✔
644	Maximum Average Subarray II		Hard
643	Maximum Average Subarray I	cpp	Easy	✔
642	Design Search Autocomplete System		Hard
640	Solve the Equation	cpp	Medium	✔
639	Decode Ways II	cpp	Hard	✔
638	Shopping Offers		Medium
637	Average of Levels in Binary Tree	cpp	Easy	✔
636	Exclusive Time of Functions	cpp	Medium	✔
635	Design Log Storage System	cpp	Medium	✔
634	Find the Derangement of An Array	cpp	Medium	✔
633	Sum of Square Numbers	cpp	Easy	✔
632	Smallest Range	cpp	Hard	✔
631	Design Excel Sum Formula	cpp	Hard	✔
630	Course Schedule III	cpp	Hard	✔
629	K Inverse Pairs Array		Hard
628	Maximum Product of Three Numbers	Go	Easy	✔
625	Minimum Factorization	Go	Medium	✔
624	Maximum Distance in Arrays	Go	Easy	✔
623	Add One Row to Tree	Go	Medium	✔
621	Task Scheduler	Go	Medium	✔
617	Merge Two Binary Trees	Go	Easy	✔
616	Add Bold Tag in String		Medium
611	Valid Triangle Number	Go	Medium	✔
609	Find Duplicate File in System	Go	Medium	✔
606	Construct String from Binary Tree	Go	Easy	✔
605	Can Place Flowers	Go	Easy	✔
604	Design Compressed String Iterator		Easy
600	Non-negative Integers without Consecutive Ones	Go	Hard	✔
599	Minimum Index Sum of Two Lists	cpp	Easy	✔
598	Range Addition II	cpp	Easy	✔
594	Longest Harmonious Subsequence	cpp	Easy	✔
593	Valid Square	cpp	Medium	✔
592	Fraction Addition and Subtraction		Medium
591	Tag Validator	Go	Hard	✔
588	Design In-Memory File System	Go	Hard	✔
587	Erect the Fence	Go	Hard	✔
583	Delete Operation for Two Strings	cpp	Medium	✔
582	Kill Process		Medium
581	Shortest Unsorted Continuous Subarray	Go	Easy	✔
576	Out of Boundary Paths	Go	Medium	✔
575	Distribute Candies	cpp	Easy	✔
573	Squirrel Simulation		Medium
572	Subtree of Another Tree	cpp	Easy	✔
568	Maximum Vacation Days		Hard
567	Permutation in String	Go	Medium	✔
566	Reshape the Matrix	cpp	Easy	✔
564	Find the Closest Palindrome	Go	Hard	✔
563	Binary Tree Tilt	cpp	Easy	✔
562	Longest Line of Consecutive One in Matrix		Medium
561	Array Partition I	cpp	Easy	✔
560	Subarray Sum Equals K	cpp	Medium	✔
557	Reverse Words in a String III	Go	Easy	✔
556	Next Greater Element III	cpp	Medium	✔
555	Split Concatenated Strings		Medium
554	Brick Wall	cpp	Medium	✔
553	Optimal Division		Medium
552	Student Attendance Record II	Go	Hard	✔
551	Student Attendance Record I	Go	Easy	✔
549	Binary Tree Longest Consecutive Sequence II		Medium
548	Split Array with Equal Sum		Medium
547	Friend Circles	Go	Medium	✔
546	Remove Boxes	Go	Hard	✔
545	Boundary of Binary Tree		Medium
544	Output Contest Matches		Medium
543	Diameter of Binary Tree	cpp	Easy	✔
542	01 Matrix	Go	Medium	✔
541	Reverse String II	cpp	Easy	✔
540	Single Element in a Sorted Array	cpp	Medium	✔
539	Minimum Time Difference	Go	Medium	✔
538	Convert BST to Greater Tree	Go	Easy	✔
537	Complex Number Multiplication	cpp	Medium	✔
536	Construct Binary Tree from String		Medium
535	Encode and Decode TinyURL	cpp	Medium	✔
533	Lonely Pixel II		Medium
532	K-diff Pairs in an Array	cpp	Easy	✔
531	Lonely Pixel I		Medium
530	Minimum Absolute Difference in BST	cpp	Easy	✔
529	Minesweeper		Medium
527	Word Abbreviation		Hard
526	Beautiful Arrangement	cpp	Medium	✔
525	Contiguous Array	cpp	Medium	✔
524	Longest Word in Dictionary through Deleting	cpp	Medium	✔
523	Continuous Subarray Sum	Go	Medium	✔
522	Longest Uncommon Subsequence II	cpp	Medium	✔
521	Longest Uncommon Subsequence I	cpp	Easy	✔
520	Detect Capital	cpp	Easy	✔
517	Super Washing Machines	Go	Hard	✔
516	Longest Palindromic Subsequence	Go	Medium	✔
515	Find Largest Value in Each Tree Row	cpp	Medium	✔
514	Freedom Trail	Go	Hard	✔
513	Find Bottom Left Tree Value	cpp	Medium	✔
508	Most Frequent Subtree Sum	cpp	Medium	✔
507	Perfect Number	Go	Easy	✔
506	Relative Ranks	cpp	Easy	✔
505	The Maze II		Medium
504	Base 7	cpp	Easy	✔
503	Next Greater Element II	cpp	Medium	✔
502	IPO	Go	Hard	✔
501	Find Mode in Binary Search Tree	cpp	Easy	✔
500	Keyboard Row	cpp	Easy	✔
499	The Maze III		Hard
498	Diagonal Traverse	cpp	Medium	✔
496	Next Greater Element I	cpp	Easy	✔
495	Teemo Attacking	cpp	Medium	✔
494	Target Sum	Go	Medium	✔
493	Reverse Pairs	Go	Hard	✔
492	Construct the Rectangle	cpp	Easy	✔
491	Increasing Subsequences		Medium
490	The Maze		Medium
488	Zuma Game	Go	Hard	✔
487	Max Consecutive Ones II		Medium
486	Predict the Winner	Go	Medium	✔
485	Max Consecutive Ones	cpp	Easy	✔
484	Find Permutation		Medium
483	Smallest Good Base	Go	Hard	✔
482	License Key Formatting	cpp	Medium	✔
481	Magical String	cpp	Medium	✔
480	Sliding Window Median	Go	Hard	✔
479	Largest Palindrome Product		Easy
477	Total Hamming Distance	cpp	Medium	✔
476	Number Complement	Go	Easy	✔
475	Heaters	cpp	Easy	✔
474	Ones and Zeroes	Go	Medium	✔
473	Matchsticks to Square		Medium
472	Concatenated Words	Go	Hard	✔
471	Encode String with Shortest Length		Hard
469	Convex Polygon		Medium
468	Validate IP Address	Go	Medium	✔
467	Unique Substrings in Wraparound String	Go	Medium	✔
466	Count The Repetitions	Go	Hard	✔
465	Optimal Account Balancing		Hard
464	Can I Win	Go	Medium	✔
463	Island Perimeter	cpp	Easy	✔
462	Minimum Moves to Equal Array Elements II	cpp	Medium	✔
461	Hamming Distance	Go	Easy	✔
460	LFU Cache	Go	Hard	✔
459	Repeated Substring Pattern	cpp	Easy	✔
456	132 Pattern	cpp	Medium	✔
455	Assign Cookies	cpp	Easy	✔
454	4Sum II	cpp	Medium	✔
453	Minimum Moves to Equal Array Elements	cpp	Easy	✔
452	Minimum Number of Arrows to Burst Balloons	cpp	Medium	✔
451	Sort Characters By Frequency	cpp	Medium	✔
450	Delete Node in a BST	cpp	Medium	✔
449	Serialize and Deserialize BST	Python	Medium	✔
448	Find All Numbers Disappeared in an Array	cpp	Easy	✔
447	Number of Boomerangs	cpp	Easy	✔
446	Arithmetic Slices II - Subsequence	Go	Hard	✔
445	Add Two Numbers II	cpp	Medium	✔
444	Sequence Reconstruction		Medium
443	String Compression		Easy
442	Find All Duplicates in an Array	cpp	Medium	✔
441	Arranging Coins	Go	Easy	✔
440	K-th Smallest in Lexicographical Order	Go	Hard	✔
439	Ternary Expression Parser		Medium
438	Find All Anagrams in a String	Go	Easy	✔
437	Path Sum III	cpp	Easy	✔
436	Find Right Interval	cpp	Medium	✔
435	Non-overlapping Intervals	cpp	Medium	✔
434	Number of Segments in a String	Go	Easy	✔
432	All O`one Data Structure	Go	Hard	✔
425	Word Squares		Hard
424	Longest Repeating Character Replacement	cpp	Medium	✔
423	Reconstruct Original Digits from English		Medium
422	Valid Word Square		Easy
421	Maximum XOR of Two Numbers in an Array		Medium
420	Strong Password Checker	Go	Hard	✔
419	Battleships in a Board	Java	Medium	✔
418	Sentence Screen Fitting		Medium
417	Pacific Atlantic Water Flow	cpp	Medium	✔
416	Partition Equal Subset Sum	Go	Medium	✔
415	Add Strings	cpp	Easy	✔
414	Third Maximum Number	Go	Easy	✔
413	Arithmetic Slices	Go	Medium	✔
412	Fizz Buzz	cpp	Easy	✔
411	Minimum Unique Word Abbreviation		Hard
410	Split Array Largest Sum	Go	Hard	✔
409	Longest Palindrome	cpp	Easy	✔
408	Valid Word Abbreviation		Easy
407	Trapping Rain Water II	Go	Hard	✔
406	Queue Reconstruction by Height	cpp	Medium	✔
405	Convert a Number to Hexadecimal	cpp	Easy	✔
404	Sum of Left Leaves	cpp	Easy	✔
403	Frog Jump	Go	Hard	✔
402	Remove K Digits	Go	Medium	✔
401	Binary Watch		Easy
400	Nth Digit	Go	Easy	✔
399	Evaluate Division	cpp	Medium	✔
398	Random Pick Index	cpp	Medium	✔
397	Integer Replacement	cpp	Medium	✔
396	Rotate Function	Go	Medium	✔
395	Longest Substring with At Least K Repeating Characters	cpp	Medium	✔
394	Decode String	cpp	Medium	✔
393	UTF-8 Validation	Go	Medium	✔
392	Is Subsequence	Go	Medium	✔
391	Perfect Rectangle	Go	Hard	✔
390	Elimination Game	cpp	Medium	✔
389	Find the Difference	cpp	Easy	✔
388	Longest Absolute File Path		Medium
387	First Unique Character in a String	cpp	Easy	✔
386	Lexicographical Numbers	cpp	Medium	✔
385	Mini Parser	cpp	Medium	✔
384	Shuffle an Array	cpp	Medium	✔
383	Ransom Note		Easy	404
382	Linked List Random Node	cpp	Medium	✔
381	Insert Delete GetRandom O(1) - Duplicates allowed	Go	Hard	✔
380	Insert Delete GetRandom O(1)	Go	Medium	✔
379	Design Phone Directory		Medium
378	Kth Smallest Element in a Sorted Matrix	cpp	Medium	✔
377	Combination Sum IV	Go	Medium	✔
376	Wiggle Subsequence	Go	Medium	✔
375	Guess Number Higher or Lower II	Go	Medium	✔
374	Guess Number Higher or Lower	cpp	Easy	✔
373	Find K Pairs with Smallest Sums	cpp	Medium	✔
372	Super Pow	cpp	Medium	✔
371	Sum of Two Integers	cpp	Easy	✔
370	Range Addition		Medium
369	Plus One Linked List		Medium
368	Largest Divisible Subset	Go	Medium	✔
367	Valid Perfect Square	cpp	Easy	✔
366	Find Leaves of Binary Tree		Medium
365	Water and Jug Problem	Go	Medium	✔
364	Nested List Weight Sum II		Medium
363	Max Sum of Rectangle No Larger Than K	Go	Hard	✔
362	Design Hit Counter		Medium
361	Bomb Enemy		Medium
360	Sort Transformed Array		Medium
359	Logger Rate Limiter		Easy
358	Rearrange String k Distance Apart		Hard
357	Count Numbers with Unique Digits	Go	Medium	✔
356	Line Reflection		Medium
355	Design Twitter	Go	Medium	✔
354	Russian Doll Envelopes	Go	Hard	✔
353	Design Snake Game		Medium
352	Data Stream as Disjoint Intervals	Go	Hard	✔
351	Android Unlock Patterns		Medium
350	Intersection of Two Arrays II	cpp	Easy	✔
349	Intersection of Two Arrays	cpp	Easy	✔
348	Design Tic-Tac-Toe		Medium
347	Top K Frequent Elements	Go	Medium	✔
346	Moving Average from Data Stream		Easy
345	Reverse Vowels of a String	cpp	Easy	✔
344	Reverse String	cpp	Easy	✔
343	Integer Break	Go	Medium	✔
342	Power of Four	cpp	Easy	✔
341	Flatten Nested List Iterator	cpp	Medium	✔
340	Longest Substring with At Most K Distinct Characters		Hard
339	Nested List Weight Sum		Easy
338	Counting Bits	Go	Medium	✔
337	House Robber III	Go	Medium	✔
336	Palindrome Pairs	Go	Hard	✔
335	Self Crossing	Go	Hard	✔
334	Increasing Triplet Subsequence	cpp	Medium	✔
333	Largest BST Subtree		Medium
332	Reconstruct Itinerary	cpp	Medium	✔
331	Verify Preorder Serialization of a Binary Tree	cpp	Medium	✔
330	Patching Array	Go	Hard	✔
329	Longest Increasing Path in a Matrix	Go	Hard	✔
328	Odd Even Linked List	cpp	Medium	✔
327	Count of Range Sum	Go	Hard	✔
326	Power of Three	Go	Easy	✔
325	Maximum Size Subarray Sum Equals k		Medium
324	Wiggle Sort II	Go	Medium	✔
323	Number of Connected Components in an Undirected Graph		Medium
322	Coin Change	Go	Medium	✔
321	Create Maximum Number	Go	Hard	✔
320	Generalized Abbreviation		Medium
319	Bulb Switcher	cpp	Medium	✔
318	Maximum Product of Word Lengths	cpp	Medium	✔
317	Shortest Distance from All Buildings		Hard
316	Remove Duplicate Letters	Go	Hard	✔
315	Count of Smaller Numbers After Self	Go	Hard	✔
314	Binary Tree Vertical Order Traversal		Medium
313	Super Ugly Number	cpp	Medium	✔
312	Burst Balloons	Go	Hard	✔
311	Sparse Matrix Multiplication		Medium
310	Minimum Height Trees	cpp	Medium	✔
309	Best Time to Buy and Sell Stock with Cooldown	Go	Medium	✔
308	Range Sum Query 2D - Mutable		Hard
307	Range Sum Query - Mutable	Go	Medium	✔
306	Additive Number		Medium
305	Number of Islands II		Hard
304	Range Sum Query 2D - Immutable	Go	Medium	✔
303	Range Sum Query - Immutable	Go	Easy	✔
302	Smallest Rectangle Enclosing Black Pixels		Hard
301	Remove Invalid Parentheses	Go	Hard	✔
300	Longest Increasing Subsequence	Go	Medium	✔
299	Bulls and Cows		Medium
298	Binary Tree Longest Consecutive Sequence		Medium
297	Serialize and Deserialize Binary Tree	Python	Hard	✔
296	Best Meeting Point		Hard
295	Find Median from Data Stream	Go	Hard	✔
294	Flip Game II		Medium
293	Flip Game		Easy
292	Nim Game		Easy
291	Word Pattern II		Hard
290	Word Pattern	Go	Easy	✔
289	Game of Life	Go	Medium	✔
288	Unique Word Abbreviation		Medium
287	Find the Duplicate Number	cpp	Medium	✔
286	Walls and Gates		Medium
285	Inorder Successor in BST		Medium
284	Peeking Iterator	cpp	Medium	✔
283	Move Zeroes	cpp	Easy	✔
282	Expression Add Operators	Go	Hard	✔
281	Zigzag Iterator		Medium
280	Wiggle Sort		Medium
279	Perfect Squares	Go	Medium	✔
278	First Bad Version	Python	Easy	✔
277	Find the Celebrity		Medium
276	Paint Fence		Easy
275	H-Index II	Go	Medium	✔
274	H-Index	Go	Medium	✔
273	Integer to English Words	Go	Hard	✔
272	Closest Binary Search Tree Value II		Hard
271	Encode and Decode Strings		Medium
270	Closest Binary Search Tree Value		Easy
269	Alien Dictionary		Hard
268	Missing Number	Go	Easy	✔
267	Palindrome Permutation II		Medium
266	Palindrome Permutation		Easy
265	Paint House II		Hard
264	Ugly Number II	Go	Medium	✔
263	Ugly Number	Go	Easy	✔
261	Graph Valid Tree		Medium
260	Single Number III	cpp	Medium	✔
259	3Sum Smaller		Medium
258	Add Digits	cpp	Easy	✔
257	Binary Tree Paths	cpp	Easy	✔
256	Paint House		Easy
255	Verify Preorder Sequence in Binary Search Tree		Medium
254	Factor Combinations		Medium
253	Meeting Rooms II		Medium
252	Meeting Rooms		Easy
251	Flatten 2D Vector		Medium
250	Count Univalue Subtrees		Medium
249	Group Shifted Strings		Medium
248	Strobogrammatic Number III		Hard
247	Strobogrammatic Number II		Medium
246	Strobogrammatic Number		Easy
245	Shortest Word Distance III		Medium
244	Shortest Word Distance II		Medium
243	Shortest Word Distance		Easy
242	Valid Anagram	cpp	Easy	✔
241	Different Ways to Add Parentheses	cpp	Medium	✔
240	Search a 2D Matrix II	cpp	Medium	✔
239	Sliding Window Maximum	Go	Hard	✔
238	Product of Array Except Self	cpp	Medium	✔
237	Delete Node in a Linked List	cpp	Easy	✔
236	Lowest Common Ancestor of a Binary Tree	cpp	Medium	✔
235	Lowest Common Ancestor of a Binary Search Tree	cpp	Easy	✔
234	Palindrome Linked List	cpp	Easy	✔
233	Number of Digit One	Go	Hard	✔
232	Implement Queue using Stacks	cpp	Easy	✔
231	Power of Two	Go	Easy	✔
230	Kth Smallest Element in a BST	cpp	Medium	✔
229	Majority Element II		Medium
228	Summary Ranges	Go	Medium	✔
227	Basic Calculator II	Go	Medium	✔
226	Invert Binary Tree	cpp	Easy	✔
225	Implement Stack using Queues	Go	Easy	✔
224	Basic Calculator	Go	Hard	✔
223	Rectangle Area	Go	Medium	✔
222	Count Complete Tree Nodes	cpp	Medium	✔
221	Maximal Square	Go	Medium	✔
220	Contains Duplicate III	Go	Medium	✔
219	Contains Duplicate II	Go	Easy	✔
218	The Skyline Problem	Go	Hard	✔
217	Contains Duplicate	Go	Easy	✔
216	Combination Sum III	cpp	Medium	✔
215	Kth Largest Element in an Array	Go	Medium	✔
214	Shortest Palindrome	Go	Hard	✔
213	House Robber II	Go	Medium	✔
212	Word Search II	Go	Hard	✔
211	Add and Search Word - Data structure design	Go	Medium	✔
210	Course Schedule II	Go	Medium	✔
209	Minimum Size Subarray Sum	Go	Medium	✔
208	Implement Trie (Prefix Tree)	Go	Medium	✔
207	Course Schedule	Go	Medium	✔
206	Reverse Linked List	Go	Easy	✔
205	Isomorphic Strings	Go	Easy	✔
204	Count Primes	Go	Easy	✔
203	Remove Linked List Elements	Go	Easy	✔
202	Happy Number	Go	Easy	✔
201	Bitwise AND of Numbers Range	Go	Medium	✔
200	Number of Islands	Go	Medium	✔
199	Binary Tree Right Side View	Go	Medium	✔
198	House Robber	Go	Easy	✔
191	Number of 1 Bits	Python	Easy	✔
190	Reverse Bits	Python	Easy	✔
189	Rotate Array	Go	Easy	✔
188	Best Time to Buy and Sell Stock IV	Go	Hard	✔
187	Repeated DNA Sequences	Go	Medium	✔
186	Reverse Words in a String II		Medium
179	Largest Number	Go	Medium	✔
174	Dungeon Game	Go	Hard	✔
173	Binary Search Tree Iterator	cpp	Medium	✔
172	Factorial Trailing Zeroes	Go	Easy	✔
171	Excel Sheet Column Number	Go	Easy	✔
170	Two Sum III - Data structure design		Easy
169	Majority Element	Go	Easy	✔
168	Excel Sheet Column Title	Go	Easy	✔
167	Two Sum II - Input array is sorted	Go	Easy	✔
166	Fraction to Recurring Decimal	Go	Medium	✔
165	Compare Version Numbers	Go	Medium	✔
164	Maximum Gap	Go	Hard	✔
163	Missing Ranges		Medium
162	Find Peak Element	Go	Medium	✔
161	One Edit Distance		Medium
160	Intersection of Two Linked Lists	Python	Easy	✔
159	Longest Substring with At Most Two Distinct Characters		Hard
158	Read N Characters Given Read4 II - Call multiple times		Hard
157	Read N Characters Given Read4		Easy
156	Binary Tree Upside Down		Medium
155	Min Stack	Go	Easy	✔
154	Find Minimum in Rotated Sorted Array II	Go	Hard	✔
153	Find Minimum in Rotated Sorted Array	Go	Medium	✔
152	Maximum Product Subarray	Go	Medium	✔
151	Reverse Words in a String	Python	Medium	✔
150	Evaluate Reverse Polish Notation	Go	Medium	✔
149	Max Points on a Line	Go	Hard	✔
148	Sort List	Go	Medium	✔
147	Insertion Sort List	Go	Medium	✔
146	LRU Cache	Go	Hard	✔
145	Binary Tree Postorder Traversal	Go	Hard	✔
144	Binary Tree Preorder Traversal	Go	Medium	✔
143	Reorder List	Go	Medium	✔
142	Linked List Cycle II	cpp	Medium	✔
141	Linked List Cycle	Python	Easy	✔
140	Word Break II	Go	Hard	✔
139	Word Break	Go	Medium	✔
138	Copy List with Random Pointer	Python	Medium	✔
137	Single Number II	Go	Medium	✔
136	Single Number	Go	Easy	✔
135	Candy	Go	Hard	✔
134	Gas Station	Go	Medium	✔
133	Clone Graph	cpp	Medium	✔
132	Palindrome Partitioning II	Go	Hard	✔
131	Palindrome Partitioning		Medium
130	Surrounded Regions	Go	Medium	✔
129	Sum Root to Leaf Numbers	Go	Medium	✔
128	Longest Consecutive Sequence	Go	Hard	✔
127	Word Ladder	Go	Medium	✔
126	Word Ladder II	Go	Hard	✔
125	Valid Palindrome	Go	Easy	✔
124	Binary Tree Maximum Path Sum	Go	Hard	✔
123	Best Time to Buy and Sell Stock III	Go	Hard	✔
122	Best Time to Buy and Sell Stock II	Go	Easy	✔
121	Best Time to Buy and Sell Stock	Go	Easy	✔
120	Triangle	Go	Medium	✔
119	Pascal's Triangle II	Go	Easy	✔
118	Pascal's Triangle	Go	Easy	✔
117	Populating Next Right Pointers in Each Node II	Python	Medium	✔
116	Populating Next Right Pointers in Each Node	Python	Medium	✔
115	Distinct Subsequences	Go	Hard	✔
114	Flatten Binary Tree to Linked List	Go	Medium	✔
113	Path Sum II	Go	Medium	✔
112	Path Sum	Go	Easy	✔
111	Minimum Depth of Binary Tree	Go	Easy	✔
110	Balanced Binary Tree	Go	Easy	✔
109	Convert Sorted List to Binary Search Tree	Go	Medium	✔
108	Convert Sorted Array to Binary Search Tree	Go	Easy	✔
107	Binary Tree Level Order Traversal II	Go	Easy	✔
106	Construct Binary Tree from Inorder and Postorder Traversal	Go	Medium	✔
105	Construct Binary Tree from Preorder and Inorder Traversal	Go	Medium	✔
104	Maximum Depth of Binary Tree	Go	Easy	✔
103	Binary Tree Zigzag Level Order Traversal	Go	Medium	✔
102	Binary Tree Level Order Traversal	Go	Medium	✔
101	Symmetric Tree	Go	Easy	✔
100	Same Tree	Go	Easy	✔
99	Recover Binary Search Tree	Go	Hard	✔
98	Validate Binary Search Tree	Go	Medium	✔
97	Interleaving String	Go	Hard	✔
96	Unique Binary Search Trees	Go	Medium	✔
95	Unique Binary Search Trees II	Go	Medium	✔
94	Binary Tree Inorder Traversal	Go	Medium	✔
93	Restore IP Addresses	Go	Medium	✔
92	Reverse Linked List II	Go	Medium	✔
91	Decode Ways	Go	Medium	✔
90	Subsets II	Go	Medium	✔
89	Gray Code	Go	Medium	✔
88	Merge Sorted Array	Go	Easy	✔
87	Scramble String	Go	Hard	✔
86	Partition List	Go	Medium	✔
85	Maximal Rectangle	Go	Hard	✔
84	Largest Rectangle in Histogram	Go	Hard	✔
83	Remove Duplicates from Sorted List	Go	Easy	✔
82	Remove Duplicates from Sorted List II	Go	Medium	✔
81	Search in Rotated Sorted Array II	Go	Medium	✔
80	Remove Duplicates from Sorted Array II	Go	Medium	✔
79	Word Search	Go	Medium	✔
78	Subsets	Go	Medium	✔
77	Combinations	Go	Medium	✔
76	Minimum Window Substring	Go	Hard	✔
75	Sort Colors	Go	Medium	✔
74	Search a 2D Matrix	Go	Medium	✔
73	Set Matrix Zeroes	Go	Medium	✔
72	Edit Distance	Go	Hard	✔
71	Simplify Path	Go	Medium	✔
70	Climbing Stairs	Go	Easy	✔
69	Sqrt(x)	Go	Easy	✔
68	Text Justification	Go	Hard	✔
67	Add Binary	Go	Easy	✔
66	Plus One	Go	Easy	✔
65	Valid Number	Go	Hard	✔
64	Minimum Path Sum	Go	Medium	✔
63	Unique Paths II	Go	Medium	✔
62	Unique Paths	Go	Medium	✔
61	Rotate List	Go	Medium	✔
60	Permutation Sequence	Go	Medium	✔
59	Spiral Matrix II	Go	Medium	✔
58	Length of Last Word	Go	Easy	✔
57	Insert Interval	Go	Hard	✔
56	Merge Intervals	Go	Medium	✔
55	Jump Game	Go	Medium	✔
54	Spiral Matrix	Go	Medium	✔
53	Maximum Subarray	Go	Easy	✔
52	N-Queens II	Go	Hard	✔
51	N-Queens	Go	Hard	✔
50	Pow(x, n)	Go	Medium	✔
49	Group Anagrams	Go	Medium	✔
48	Rotate Image	Go	Medium	✔
47	Permutations II	Go	Medium	✔
46	Permutations	Go	Medium	✔
45	Jump Game II	Go	Hard	✔
44	Wildcard Matching	Go	Hard	✔
43	Multiply Strings	Go	Medium	✔
42	Trapping Rain Water	Go	Hard	✔
41	First Missing Positive	Go	Hard	✔
40	Combination Sum II	Go	Medium	✔
39	Combination Sum	Go	Medium	✔
38	Count and Say	Go	Easy	✔
37	Sudoku Solver	Go	Hard	✔
36	Valid Sudoku	Go	Medium	✔
35	Search Insert Position	Go	Easy	✔
34	Search for a Range	Go	Medium	✔
33	Search in Rotated Sorted Array	Go	Medium	✔
32	Longest Valid Parentheses	Go	Hard	✔
31	Next Permutation	Go	Medium	✔
30	Substring with Concatenation of All Words	Go	Hard	✔
29	Divide Two Integers	Go	Medium	✔
28	Implement strStr()	Go	Easy	✔
27	Remove Element	Go	Easy	✔
26	Remove Duplicates from Sorted Array	Go	Easy	✔
25	Reverse Nodes in k-Group	Go	Hard	✔
24	Swap Nodes in Pairs	Go	Medium	✔
23	Merge k Sorted Lists	Go	Hard	✔
22	Generate Parentheses	Go	Medium	✔
21	Merge Two Sorted Lists	Go	Easy	✔
20	Valid Parentheses	Go	Easy	✔
19	Remove Nth Node From End of List	Go	Medium	✔
18	4Sum	Go	Medium	✔
17	Letter Combinations of a Phone Number	Go	Medium	✔
16	3Sum Closest	Go	Medium	✔
15	3Sum	Go	Medium	✔
14	Longest Common Prefix	Go	Easy	✔
13	Roman to Integer	Go	Easy	✔
12	Integer to Roman	Go	Medium	✔
11	Container With Most Water	Go	Medium	✔
10	Regular Expression Matching	Go	Hard	✔
9	Palindrome Number	Go	Easy	✔
8	String to Integer (atoi)	Go	Medium	✔
7	Reverse Integer	Go	Easy	✔
6	ZigZag Conversion	Go	Medium	✔
5	Longest Palindromic Substring	Go	Medium	✔
4	Median of Two Sorted Arrays	Go	Hard	✔
3	Longest Substring Without Repeating Characters	Go	Medium	✔
2	Add Two Numbers	Go	Medium	✔
1	Two Sum	Go	Easy	✔