GitHub - yubinbai/leetcode: Solutions to Leetcode Online Judge

Leetcode solutions in C++, Java, Python

Number	Title	Difficulty
408	Valid Word Abbreviation	Medium
407	Trapping Rain Water II	Hard
406	Queue Reconstruction by Height	Medium
405	Convert a Number to Hexadecimal	Easy
404	Sum of Left Leaves	Easy
403	Frog Jump	Hard
402	Remove K Digits	Medium
401	Binary Watch	Easy
400	Nth Digit	Medium
399	Evaluate Division	Medium
398	Random Pick Index	Medium
397	Integer Replacement	Medium
396	Rotate Function	Medium
395	Longest Substring with At Least K Repeating Characters	Medium
394	Decode String	Medium
393	UTF-8 Validation	Medium
392	Is Subsequence	Easy
391	Perfect Rectangle	Hard
390	Elimination Game	Medium
389	Find the Difference	Easy
388	Longest Absolute File Path	Medium
387	First Unique Character in a String	Easy
386	Lexicographical Numbers	Medium
385	Mini parser	Medium
384	Shuffle An Array	Medium
383	Ransom Note	Easy
382	Linked List Random Node	Medium
381	Insert Delete GetRandom O(1) Duplicate	Hard
380	Insert Delete GetRandom O(1)	Medium
379	Design Phone Directory	Medium
378	Kth Smallest Element in a Sorted Matrix	Medium
377	Combination Sum IV	Medium
376	Wiggle sequence	Medium
375	Guess number higher or lower ii	Medium
374	Guess number higher or lower	Easy
373	Find K Pairs with Smallest Sums	Medium
372	Super Pow	Medium
371	Sum of Two Integers	Easy
370	Range Addition	Medium
369	Plus One Linked List	Medium
368	Largest divisible subset	Medium
367	Valid Perfect Square	Medium
366	Find Leaves of Binary Tree	Medium
365	Water and Jug Problem	Medium
364	Nested List Weight Sum II	Medium
363	Max Sum of Rectangle No Larger Than K	Hard
362	Design Hit Counter	Medium
361	Bomb Enemy	Medium
360	Sort Transformed Array	Medium
359	Logger Rate Limiter	Easy
358	Rearrage String K distance Apart	Hard
357	Count Numbers with Unique Digits	Medium
356	Line Reflection	Medium
355	Design Twitter	Medium
354	Russian Doll Envelopes	Hard
353	Design Snake Game	Medium
352	Data Stream as Disjoint Intervals	Hard
351	Android unlock patterns	Medium
350	Intersection of Two Arrays II	Easy
349	Intersection of Two Arrays	Easy
348	Design tic-tac-toe	Medium
347	Top K frequent elements	Medium
346	Moving Average from data stream	Easy
345	Reverse Vowels of a String	Easy
344	Reverse String	Easy
343	Integer Break	Medium
342	Power of Four	Easy
341	Flatten Nested List Iterator	Medium
340	Longest Substring with At Most K Distinct Characters	Hard
339	Nested List Weight Sum	Easy
338	Counting Bits	Medium
337	House Robber III	Medium
336	Palindrome Pairs	Hard
335	Self Crossing	Hard
334	Increasing Triplet Subsequence	Medium
333	Largest BST subtree	Medium
332	Reconstruct Itinerary	Medium
331	Verify Preorder Serialization of a Binary Tree	Medium
330	Patching Array	Medium
329	Longest Increasing Path in a Matrix	Hard
328	Odd Even Linked List	Easy
327	Count of Range Sum	Hard
326	Power of Three	Easy
325	Maximum Size Subarray Sum Equals k	Easy
324	Wiggle Sort II	Medium
323	Number of Connected Components	Medium
322	Coin Change	Medium
321	Create Maximum Number	Hard
320	Generalized Abbreviation	Medium
319	Bulb Switcher	Medium
318	Maximum Product of Word Lengths	Medium
317	Shortest Distance from All Buildings	Hard
316	Remove Duplicate Letters	Medium
315	Count of Smaller Numbers After Self	Hard
314	Binary Tree Vertical Order Traversal	Medium
313	Super Ugly Number	Medium
312	Burst Balloons	Medium
311	Sparse Matrix Multiplication	Medium
310	Minimum Height Trees	Medium
309	Best Time to Buy and Sell Stock with Cooldown	Medium
308	Range Sum Query 2D - Mutable	Hard
307	Range Sum Query - Mutable	Medium
306	Additive Number	Medium
305	Number of Islands II	Hard
304	Range Sum Query 2D - Immutable	Medium
303	Range Sum Query - Immutable	Easy
302	Smallest Rectangle Enclosing Black Pixels	Hard
301	Remove Invalid Parentheses	Hard
300	Longest Increasing Subsequence	Medium
299	Bulls and Cows	Easy
298	Binary Tree Longest Consecutive Sequence	Medium
297	Serialize and Deserialize Binary Tree	Medium
296	Best Meeting Point	Hard
295	Find Median from Data Stream	Hard
294	Flip Game II	Medium
293	Flip Game	Easy
292	Nim Game	Easy
291	Word Pattern II	Hard
290	Word Pattern	Easy
289	Game of Life	Medium
288	Unique Word Abbreviation	Easy
287	Find the Duplicate Number	Hard
286	Walls and Gates	Medium
285	Inorder Successor in BST	Medium
284	Peeking Iterator	Medium
283	Moving Zeroes	Easy
282	Expression Add Operators	Hard
281	Zigzag Iterator	Medium
280	Wiggle Sort	Medium
279	Perfect Squares	Medium
278	First Bad Version	Easy
277	Find the Celebrity	Medium
276	Paint Fence	Easy
275	H Index II	Medium
274	H Index	Medium
273	Integer to English Words	Medium
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	Medium
267	Palindrome Permutation II	Medium
266	Palindrome Permutation	Easy
265	Paint House II	Hard
264	Ugly Number II	Medium
263	Ugly Number	Easy
261	Graph Valid Tree	Medium
260	Single Number III	Medium
259	3Sum Smaller	Medium
258	Add Digits	Easy
257	Binary Tree Paths	Easy
256	Paint House	Medium
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	Easy
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	Easy
241	Different Ways to Add Parentheses	Medium
240	Search a 2D Matrix II	Medium
239	Sliding Window Maximum	Hard
238	Product of Array Except Self	Medium
237	Delete Node in a Linked List	Easy
236	Lowest Common Ancestor of a Binary Tree	Medium
235	Lowest Common Ancestor of a Binary Search Tree	Easy
234	Palindrome Linked List	Easy
233	Number of Digit One	Medium
232	Implement Queue using Stacks	Easy
231	Power of Two	Easy
230	Kth Smallest Element in a BST	Medium
229	Majority Element II	Medium
228	Summary Ranges	Easy
227	Basic Calculator II	Medium
226	Invert Binary Tree	Easy
225	Implement Stack using Queues	Medium
224	Basic Calculator	Medium
223	Rectangle Area	Easy
222	Count Complete Tree Nodes	Medium
221	Maximal Square	Medium
220	Contains duplicate iii	Medium
219	Contains duplicate ii	Easy
218	The Skyline Problem	Hard
217	Contains duplicate	Easy
216	Combination Sum III	Medium
215	Kth Largest Element in an Array	Medium
214	Shortest Palindrome	Hard
213	House robber II	Medium
212	Word search II	Hard
211	Add and Search Word	Medium
210	Course schedule II	Medium
209	Minimum Size Subarray Sum	Medium
208	Implement Trie	Medium
207	Course schedule	Medium
205	Revese linkedlist	Easy
205	Isomorphic Strings	Easy
204	Count primes	Medium
203	Remove Linked List Elements	Easy
202	Happy Number	Easy
201	Bitwise AND of Numbers Range	Medium
200	Number of islands	Medium
199	Binary tree right side view	Medium
198	House robber	Easy
191	Number of 1 bits	Easy
190	Reverse bits	Easy
189	Rotate array	Easy
188	Best Time to Buy and Sell Stock IV	Hard
187	Repeated DNA Sequences	Medium
176	Reverse Words in a String II	Medium
179	Largest Number	Medium
174	Dungeon Game	Hard
173	Binary Search Tree Iterator	Medium
172	Factorial Trailing Zeroes	Easy
171	Excel Sheet Column Number	Easy
169	Majority Element	Easy
168	Excel Sheet Column Title	Easy
166	Fraction to Recurring Decimal	Medium
165	Compare Version Numbers	Easy
164	Maximum Gap	Hard
163	Missing Ranges	Medium
162	Find Peak Element	Medium
161	One Edit Distance	Medium
160	Intersection of Two Linked Lists	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	Easy
154	Find Minimum in Rotated Sorted Array II	Hard
153	Find Minimum in Rotated Sorted Array	Medium
152	Maximum Product Subarray	Medium
151	Reverse Words in a String	Medium
150	Evaluate Reverse Polish Notation	Medium
149	Max Points on a Line	Hard
148	Sort List	Medium
147	Insertion Sort List	Medium
146	LRU Cache	Hard
145	Binary Tree Postorder Traversal	Hard
144	Binary Tree Preorder Traversal	Medium
143	Reorder List	Medium
142	Linked List Cycle II	Medium
141	Linked List Cycle	Medium
140	Word Break II	Hard
139	Word Break	Medium
138	Copy List with Random Pointer	Hard
137	Single Number II	Medium
136	Single Number	Medium
135	Candy	Hard
134	Gas Station	Medium
133	Clone Graph	Medium
132	Palindrome Partitioning II	Hard
131	Palindrome Partitioning	Medium
130	Surrounded Regions	Medium
129	Sum Root to Leaf Numbers	Medium
128	Longest Consecutive Sequence	Hard
127	Word Ladder II	Hard
126	Word Ladder	Medium
125	Valid Palindrome	Easy
124	Binary Tree Maximum Path Sum	Hard
123	Best Time to Buy and Sell Stock III	Hard
122	Best Time to Buy and Sell Stock II	Medium
121	Best Time to Buy and Sell Stock	Medium
120	Triangle	Medium
119	Pascal’s Triangle II	Easy
118	Pascal’s Triangle	Easy
117	Populating Next Right Pointers in Each Node II	Hard
116	Populating Next Right Pointers in Each Node	Medium
115	Distinct Subsequences	Hard
114	Flatten Binary Tree to Linked List	Medium
113	Path Sum II	Medium
112	Path Sum	Easy
111	Minimum Depth of Binary Tree	Easy
110	Balanced Binary Tree	Easy
109	Convert Sorted List to Binary Search Tree	Medium
108	Convert Sorted Array to Binary Search Tree	Medium
107	Binary Tree Level Order Traversal II	Easy
106	Construct Binary Tree from Inorder and Postorder	Medium
105	Construct Binary Tree from Preorder and Inorder	Medium
104	Maximum Depth of Binary Tree	Easy
103	Binary Tree Zigzag Level Order Traversal	Medium
102	Binary Tree Level Order Traversal	Easy
101	Symmetric Tree	Easy
100	Same Tree	Easy
99	Recover Binary Search Tree	Hard
98	Validate Binary Search Tree	Medium
97	Interleaving String	Hard
96	Unique Binary Search Trees II	Medium
95	Unique Binary Search Trees	Medium
94	Binary Tree Inorder Traversal	Medium
93	Restore IP Addresses	Medium
92	Reverse linked List II	Medium
91	Subsets II	Medium
90	Decode Ways	Medium
89	Gray Code	Medium
88	Merge Sorted Array	Easy
87	Scramble String	Hard
86	Partition List	Medium
85	Maximal Rectangle	Hard
84	Largest Rectangle in Histogram	Hard
83	Remove Duplicates from Sorted List II	Medium
82	Remove Duplicates from Sorted List	Easy
81	Search in Rotated Sorted Array II	Medium
80	Remove Duplicates from Sorted Array II	Medium
79	Word Search	Medium
78	Subsets	Medium
77	Combinations	Medium
76	Minimum Window Substring	Hard
75	Sort Colors	Medium
74	Search a 2D Matrix	Medium
73	Set Matrix Zeroes	Medium
72	Edit Distance	Hard
71	Simplify Path	Medium
70	Climbing Stairs	Easy
69	Sqrt(x)	Medium
68	Text Justification	Hard
67	Plus One	Easy
66	Valid Number	Easy
65	Add Binary	Easy
64	Merge Two Sorted Lists	Easy
63	Minimum Path Sum	Medium
62	Unique Paths II	Medium
61	Unique Paths	Medium
60	Rotate List	Medium
59	Permutation Sequence	Medium
58	Spiral Matrix II	Medium
57	Length of Last Word	Easy
56	Insert Interval	Hard
55	Merge Intervals	Hard
54	Jump Game	Medium
53	Spiral Matrix	Medium
52	Maximum Subarray	Medium
51	N-Queens II	Hard
50	N-Queens	Hard
49	“Pow(x, n)”	Medium
48	Anagrams	Medium
47	Rotate Image	Medium
46	Permutations II	Hard
45	Permutations	Medium
44	Jump Game II	Hard
43	Wildcard Matching	Hard
41	Trapping Rain Water	Hard
40	First Missing Positive	Hard
39	Combination Sum II	Medium
38	Combination Sum	Medium
37	Count and Say	Easy
36	Sudoku Solver	Hard
35	Valid Sudoku	Easy
34	Search Insert Position	Medium
33	Search for a Range	Medium
31	Longest Valid Parentheses	Hard
32	Search in Rotated Sorted Array	Hard
30	Next Permutation	Medium
29	Substring with Concatenation of All Words	Hard
28	Divide Two Integers	Medium
27	Implement strStr()	Easy
26	Remove Element	Easy
25	Remove Duplicates from Sorted Array	Easy
24	Reverse Nodes in k-Group	Hard
23	Swap Nodes in Pairs	Medium
22	Merge k Sorted Lists	Hard
21	Generate Parentheses	Medium
20	Valid Parentheses	Easy
19	Remove Nth Node From End of List	Easy
18	Letter Combinations of a Phone Number	Medium
17	4Sum	Medium
16	3Sum Closest	Medium
15	3Sum	Medium
14	Longest Common Prefix	Easy
13	Roman to Integer	Easy
12	Integer to Roman	Medium
11	Container With Most Water	Medium
10	Regular Expression Matching	Hard
9	Palindrome Number	Easy
8	String to Integer (atoi)	Easy
7	Reverse Integer	Easy
6	ZigZag Conversion	Easy
5	Longest Palindromic Substring	Medium
4	Median of Two Sorted Arrays	Hard
3	Longest Substring Without Repeating Characters	Medium
2	Add Two Numbers	Medium
1	Two Sum	Medium

Name		Name	Last commit message	Last commit date
Latest commit History 686 Commits
common_questions		common_questions
src		src
xcode-project/leetcode-debugger		xcode-project/leetcode-debugger
.gitignore		.gitignore
LICENSE.md		LICENSE.md
README.org		README.org

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