LeetCode

LeetCode solutions in C++ 11.

NO.	Title	Solution	Note	Difficulty
0	Two Sum	C++	Note	Easy
1	Add Two Numbers	C++	Note	Medium
2	Longest Substring Without Repeating Characters	C++	Note	Medium
3	Median of Two Sorted Arrays	C++	Note	Hard
4	Longest Palindromic Substring	C++	Note	Medium
5	ZigZag Conversion	C++	Note	Medium
6	Reverse Integer	C++	Note	Easy
7	String to Integer (atoi)	C++	Note	Medium
8	Palindrome Number	C++	Note	Easy
9	Regular Expression Matching	C++	Note	Hard
10	Container With Most Water	C++	Note	Medium
11	Integer to Roman	C++	Note	Medium
12	Roman to Integer	C++	Note	Easy
13	Longest Common Prefix	C++	Note	Easy
14	3Sum	C++	Note	Medium
15	3Sum Closest	C++	Note	Medium
16	Letter Combinations of a Phone Number	C++	Note	Medium
17	4Sum	C++	Note	Medium
18	Remove Nth Node From End of List	C++	Note	Medium
19	Valid Parentheses	C++	Note	Easy
20	Merge Two Sorted Lists	C++	Note	Easy
21	Generate Parentheses	C++	Note	Medium
22	Merge k Sorted Lists	C++	Note	Hard
23	Swap Nodes in Pairs	C++	Note	Medium
24	Reverse Nodes in k-Group	C++	Note	Hard
25	Remove Duplicates from Sorted Array	C++	Note	Easy
26	Remove Element	C++	Note	Easy
27	Implement strStr()	C++	Note	Easy
28	Divide Two Integers	C++	Note	Medium
29	Substring with Concatenation of All Words	C++	Note	Hard
30	Next Permutation	C++	Note	Medium
31	Longest Valid Parentheses	C++	Note	Hard
32	Search in Rotated Sorted Array	C++	Note	Medium
33	Search for a Range	C++	Note	Medium
34	Search Insert Position	C++	Note	Easy
35	Valid Sudoku	C++	Note	Medium
36	Sudoku Solver	C++	Note	Hard
37	Count and Say	C++	Note	Easy
38	Combination Sum	C++	Note	Medium
39	Combination Sum II	C++	Note	Medium
40	First Missing Positive	C++	Note	Hard
41	Trapping Rain Water	C++	Note	Hard
42	Multiply Strings	C++	Note	Medium
43	Wildcard Matching	C++	Note	Hard
44	Jump Game II	C++	Note	Hard
45	Permutations	C++	Note	Medium
46	Permutations II	C++	Note	Medium
47	Rotate Image	C++	Note	Medium
48	Group Anagrams	C++	Note	Medium
49	Pow(x, n)	C++	Note	Medium
50	N-Queens	C++	Note	Hard
51	N-Queens II	C++	Note	Hard
52	Maximum Subarray	C++	Note	Easy
53	Spiral Matrix	C++	Note	Medium
54	Jump Game	C++	Note	Medium
55	Merge Intervals	C++	Note	Medium
56	Insert Interval	C++	Note	Hard
57	Length of Last Word	C++	Note	Easy
58	Spiral Matrix II	C++	Note	Medium
59	Permutation Sequence	C++	Note	Medium
60	Rotate List	C++	Note	Medium
61	Unique Paths	C++	Note	Medium
62	Unique Paths II	C++	Note	Medium
63	Minimum Path Sum	C++	Note	Medium
64	Valid Number	C++	Note	Hard
65	Plus One	C++	Note	Easy
66	Add Binary	C++	Note	Easy
67	Text Justification	C++	Note	Hard
68	Sqrt(x)	C++	Note	Easy
69	Climbing Stairs	C++	Note	Easy
70	Simplify Path	C++	Note	Medium
71	Edit Distance	C++	Note	Hard
72	Set Matrix Zeroes	C++	Note	Medium
73	Search a 2D Matrix	C++	Note	Medium
74	Sort Colors	C++	Note	Medium
75	Minimum Window Substring	C++	Note	Hard
76	Combinations	C++	Note	Medium
77	Subsets	C++	Note	Medium
78	Word Search	C++	Note	Medium
79	Remove Duplicates from Sorted Array II	C++	Note	Medium
80	Search in Rotated Sorted Array II	C++	Note	Medium
81	Remove Duplicates from Sorted List II	C++	Note	Medium
82	Remove Duplicates from Sorted List	C++	Note	Easy
83	Largest Rectangle in Histogram	C++	Note	Hard
84	Maximal Rectangle	C++	Note	Hard
85	Partition List	C++	Note	Medium
86	Scramble String	C++	Note	Hard
87	Merge Sorted Array	C++	Note	Easy
88	Gray Code	C++	Note	Medium
89	Subsets II	C++	Note	Medium
90	Decode Ways	C++	Note	Medium
91	Reverse Linked List II	C++	Note	Medium
92	Restore IP Addresses	C++	Note	Medium
93	Binary Tree Inorder Traversal	C++	Note	Medium
94	Unique Binary Search Trees II	C++	Note	Medium
95	Unique Binary Search Trees	C++	Note	Medium
96	Interleaving String	C++	Note	Hard
97	Validate Binary Search Tree	C++	Note	Medium
98	Recover Binary Search Tree	C++	Note	Hard
99	Same Tree	C++	Note	Easy
100	Symmetric Tree	C++	Note	Easy
101	Binary Tree Level Order Traversal	C++	Note	Medium
102	Binary Tree Zigzag Level Order Traversal	C++	Note	Medium
103	Maximum Depth of Binary Tree	C++	Note	Easy
104	Construct Binary Tree from Preorder and Inorder Traversal	C++	Note	Medium
105	Construct Binary Tree from Inorder and Postorder Traversal	C++	Note	Medium
106	Binary Tree Level Order Traversal II	C++	Note	Easy
107	Convert Sorted Array to Binary Search Tree	C++	Note	Easy
108	Convert Sorted List to Binary Search Tree	C++	Note	Medium
109	Balanced Binary Tree	C++	Note	Easy
110	Minimum Depth of Binary Tree	C++	Note	Easy
111	Path Sum	C++	Note	Easy
112	Path Sum II	C++	Note	Medium
113	Flatten Binary Tree to Linked List	C++	Note	Medium
114	Distinct Subsequences	C++	Note	Hard
115	Populating Next Right Pointers in Each Node	C++	Note	Medium
116	Populating Next Right Pointers in Each Node II	C++	Note	Medium
117	Pascal's Triangle	C++	Note	Easy
118	Pascal's Triangle II	C++	Note	Easy
119	Triangle	C++	Note	Medium
120	Best Time to Buy and Sell Stock	C++	Note	Easy
121	Best Time to Buy and Sell Stock II	C++	Note	Easy
122	Best Time to Buy and Sell Stock III	C++	Note	Hard
123	Binary Tree Maximum Path Sum	C++	Note	Hard
124	Valid Palindrome	C++	Note	Easy
125	Word Ladder II	C++	Note	Hard
126	Word Ladder	C++	Note	Medium
127	Longest Consecutive Sequence	C++	Note	Hard
128	Sum Root to Leaf Numbers	C++	Note	Medium
129	Surrounded Regions	C++	Note	Medium
130	Palindrome Partitioning	C++	Note	Medium
131	Palindrome Partitioning II	C++	Note	Hard
132	Clone Graph	C++	Note	Medium
133	Gas Station	C++	Note	Medium
134	Candy	C++	Note	Hard
135	Single Number	C++	Note	Easy
136	Single Number II	C++	Note	Medium
137	Copy List with Random Pointer	C++	Note	Medium
138	Word Break	C++	Note	Medium
139	Word Break II	C++	Note	Hard
140	Linked List Cycle	C++	Note	Easy
141	Linked List Cycle II	C++	Note	Medium
142	Reorder List	C++	Note	Medium
143	Binary Tree Preorder Traversal	C++	Note	Medium
144	Binary Tree Postorder Traversal	C++	Note	Hard
145	LRU Cache	C++	Note	Hard
146	Insertion Sort List	C++	Note	Medium
147	Sort List	C++	Note	Medium
148	Max Points on a Line	C++	Note	Hard
149	Evaluate Reverse Polish Notation	C++	Note	Medium
150	Reverse Words in a String	C++	Note	Medium
151	Maximum Product Subarray	C++	Note	Medium
152	Find Minimum in Rotated Sorted Array	C++	Note	Medium
153	Find Minimum in Rotated Sorted Array II	C++	Note	Hard
154	Min Stack	C++	Note	Easy
155	Binary Tree Upside Down	C++	Note	None
156	Read N Characters Given Read4	C++	Note	None
157	Read N Characters Given Read4 II - Call multiple times	C++	Note	None
158	Longest Substring with At Most Two Distinct Characters	C++	Note	None
159	Intersection of Two Linked Lists	C++	Note	Easy
160	One Edit Distance	C++	Note	None
161	Find Peak Element	C++	Note	Medium
162	Missing Ranges	C++	Note	None
163	Maximum Gap	C++	Note	Hard
164	Compare Version Numbers	C++	Note	Medium
165	Fraction to Recurring Decimal	C++	Note	Medium
166	Two Sum II - Input array is sorted	C++	Note	Easy
167	Excel Sheet Column Title	C++	Note	Easy
168	Majority Element	C++	Note	Easy
169	Two Sum III - Data structure design	C++	Note	None
170	Excel Sheet Column Number	C++	Note	Easy
171	Factorial Trailing Zeroes	C++	Note	Easy
172	Binary Search Tree Iterator	C++	Note	Medium
173	Dungeon Game	C++	Note	Hard
174	Combine Two Tables	C++	Note	Easy
175	Second Highest Salary	C++	Note	Easy
176	Nth Highest Salary	C++	Note	Medium
177	Rank Scores	C++	Note	Medium
178	Largest Number	C++	Note	Medium
179	Consecutive Numbers	C++	Note	Medium
180	Employees Earning More Than Their Managers	C++	Note	Easy
181	Duplicate Emails	C++	Note	Easy
182	Customers Who Never Order	C++	Note	Easy
183	Department Highest Salary	C++	Note	Medium
184	Department Top Three Salaries	C++	Note	Hard
185	Reverse Words in a String II	C++	Note	None
186	Repeated DNA Sequences	C++	Note	Medium
187	Best Time to Buy and Sell Stock IV	C++	Note	Hard
188	Rotate Array	C++	Note	Easy
189	Reverse Bits	C++	Note	Easy
190	Number of 1 Bits	C++	Note	Easy
191	Word Frequency	C++	Note	Medium
192	Valid Phone Numbers	C++	Note	Easy
193	Transpose File	C++	Note	Medium
194	Tenth Line	C++	Note	Easy
195	Delete Duplicate Emails	C++	Note	Easy
196	Rising Temperature	C++	Note	Easy
197	House Robber	C++	Note	Easy
198	Binary Tree Right Side View	C++	Note	Medium
199	Number of Islands	C++	Note	Medium
200	Bitwise AND of Numbers Range	C++	Note	Medium
201	Happy Number	C++	Note	Easy
202	Remove Linked List Elements	C++	Note	Easy
203	Count Primes	C++	Note	Easy
204	Isomorphic Strings	C++	Note	Easy
205	Reverse Linked List	C++	Note	Easy
206	Course Schedule	C++	Note	Medium
207	Implement Trie (Prefix Tree)	C++	Note	Medium
208	Minimum Size Subarray Sum	C++	Note	Medium
209	Course Schedule II	C++	Note	Medium
210	Add and Search Word - Data structure design	C++	Note	Medium
211	Word Search II	C++	Note	Hard
212	House Robber II	C++	Note	Medium
213	Shortest Palindrome	C++	Note	Hard
214	Kth Largest Element in an Array	C++	Note	Medium
215	Combination Sum III	C++	Note	Medium
216	Contains Duplicate	C++	Note	Easy
217	The Skyline Problem	C++	Note	Hard
218	Contains Duplicate II	C++	Note	Easy
219	Contains Duplicate III	C++	Note	Medium
220	Maximal Square	C++	Note	Medium
221	Count Complete Tree Nodes	C++	Note	Medium
222	Rectangle Area	C++	Note	Medium
223	Basic Calculator	C++	Note	Hard
224	Implement Stack using Queues	C++	Note	Easy
225	Invert Binary Tree	C++	Note	Easy
226	Basic Calculator II	C++	Note	Medium
227	Summary Ranges	C++	Note	Medium
228	Majority Element II	C++	Note	Medium
229	Kth Smallest Element in a BST	C++	Note	Medium
230	Power of Two	C++	Note	Easy
231	Implement Queue using Stacks	C++	Note	Easy
232	Number of Digit One	C++	Note	Hard
233	Palindrome Linked List	C++	Note	Easy
234	Lowest Common Ancestor of a Binary Search Tree	C++	Note	Easy
235	Lowest Common Ancestor of a Binary Tree	C++	Note	Medium
236	Delete Node in a Linked List	C++	Note	Easy
237	Product of Array Except Self	C++	Note	Medium
238	Sliding Window Maximum	C++	Note	Hard
239	Search a 2D Matrix II	C++	Note	Medium
240	Different Ways to Add Parentheses	C++	Note	Medium
241	Valid Anagram	C++	Note	Easy
242	Shortest Word Distance	C++	Note	None
243	Shortest Word Distance II	C++	Note	None
244	Shortest Word Distance III	C++	Note	None
245	Strobogrammatic Number	C++	Note	None
246	Strobogrammatic Number II	C++	Note	None
247	Strobogrammatic Number III	C++	Note	None
248	Group Shifted Strings	C++	Note	None
249	Count Univalue Subtrees	C++	Note	None
250	Flatten 2D Vector	C++	Note	None
251	Meeting Rooms	C++	Note	None
252	Meeting Rooms II	C++	Note	None
253	Factor Combinations	C++	Note	None
254	Verify Preorder Sequence in Binary Search Tree	C++	Note	None
255	Paint House	C++	Note	None
256	Binary Tree Paths	C++	Note	Easy
257	Add Digits	C++	Note	Easy
258	3Sum Smaller	C++	Note	None
259	Single Number III	C++	Note	Medium
260	Graph Valid Tree	C++	Note	None
261	Trips and Users	C++	Note	Hard
262	Ugly Number	C++	Note	Easy
263	Ugly Number II	C++	Note	Medium
264	Paint House II	C++	Note	None
265	Palindrome Permutation	C++	Note	None
266	Palindrome Permutation II	C++	Note	None
267	Missing Number	C++	Note	Easy
268	Alien Dictionary	C++	Note	None
269	Closest Binary Search Tree Value	C++	Note	None
270	Encode and Decode Strings	C++	Note	None
271	Closest Binary Search Tree Value II	C++	Note	None
272	Integer to English Words	C++	Note	Hard
273	H-Index	C++	Note	Medium
274	H-Index II	C++	Note	Medium
275	Paint Fence	C++	Note	None
276	Find the Celebrity	C++	Note	None
277	First Bad Version	C++	Note	Easy
278	Perfect Squares	C++	Note	Medium
279	Wiggle Sort	C++	Note	None
280	Zigzag Iterator	C++	Note	None
281	Expression Add Operators	C++	Note	Hard
282	Move Zeroes	C++	Note	Easy
283	Peeking Iterator	C++	Note	Medium
284	Inorder Successor in BST	C++	Note	None
285	Walls and Gates	C++	Note	None
286	Find the Duplicate Number	C++	Note	Medium
287	Unique Word Abbreviation	C++	Note	None
288	Game of Life	C++	Note	Medium
289	Word Pattern	C++	Note	Easy
290	Word Pattern II	C++	Note	None
291	Nim Game	C++	Note	Easy
292	Flip Game	C++	Note	None
293	Flip Game II	C++	Note	None
294	Find Median from Data Stream	C++	Note	Hard
295	Best Meeting Point	C++	Note	None
296	Serialize and Deserialize Binary Tree	C++	Note	Hard
297	Binary Tree Longest Consecutive Sequence	C++	Note	None
298	Bulls and Cows	C++	Note	Medium
299	Longest Increasing Subsequence	C++	Note	Medium
300	Remove Invalid Parentheses	C++	Note	Hard
301	Smallest Rectangle Enclosing Black Pixels	C++	Note	None
302	Range Sum Query - Immutable	C++	Note	Easy
303	Range Sum Query 2D - Immutable	C++	Note	Medium
304	Number of Islands II	C++	Note	None
305	Additive Number	C++	Note	Medium
306	Range Sum Query - Mutable	C++	Note	Medium
307	Range Sum Query 2D - Mutable	C++	Note	None
308	Best Time to Buy and Sell Stock with Cooldown	C++	Note	Medium
309	Minimum Height Trees	C++	Note	Medium
310	Sparse Matrix Multiplication	C++	Note	None
311	Burst Balloons	C++	Note	Hard
312	Super Ugly Number	C++	Note	Medium
313	Binary Tree Vertical Order Traversal	C++	Note	None
314	Count of Smaller Numbers After Self	C++	Note	Hard
315	Remove Duplicate Letters	C++	Note	Hard
316	Shortest Distance from All Buildings	C++	Note	None
317	Maximum Product of Word Lengths	C++	Note	Medium
318	Bulb Switcher	C++	Note	Medium
319	Generalized Abbreviation	C++	Note	None
320	Create Maximum Number	C++	Note	Hard
321	Coin Change	C++	Note	Medium
322	Number of Connected Components in an Undirected Graph	C++	Note	None
323	Wiggle Sort II	C++	Note	Medium
324	Maximum Size Subarray Sum Equals k	C++	Note	None
325	Power of Three	C++	Note	Easy
326	Count of Range Sum	C++	Note	Hard
327	Odd Even Linked List	C++	Note	Medium
328	Longest Increasing Path in a Matrix	C++	Note	Hard
329	Patching Array	C++	Note	Hard
330	Verify Preorder Serialization of a Binary Tree	C++	Note	Medium
331	Reconstruct Itinerary	C++	Note	Medium
332	Largest BST Subtree	C++	Note	None
333	Increasing Triplet Subsequence	C++	Note	Medium
334	Self Crossing	C++	Note	Hard
335	Palindrome Pairs	C++	Note	Hard
336	House Robber III	C++	Note	Medium
337	Counting Bits	C++	Note	Medium
338	Nested List Weight Sum	C++	Note	None
339	Longest Substring with At Most K Distinct Characters	C++	Note	None
340	Flatten Nested List Iterator	C++	Note	Medium
341	Power of Four	C++	Note	Easy
342	Integer Break	C++	Note	Medium
343	Reverse String	C++	Note	Easy
344	Reverse Vowels of a String	C++	Note	Easy
345	Moving Average from Data Stream	C++	Note	None
346	Top K Frequent Elements	C++	Note	Medium
347	Design Tic-Tac-Toe	C++	Note	None
348	Intersection of Two Arrays	C++	Note	Easy
349	Intersection of Two Arrays II	C++	Note	Easy
350	Android Unlock Patterns	C++	Note	None
351	Data Stream as Disjoint Intervals	C++	Note	Hard
352	Design Snake Game	C++	Note	None
353	Russian Doll Envelopes	C++	Note	Hard
354	Design Twitter	C++	Note	Medium
355	Line Reflection	C++	Note	None
356	Count Numbers with Unique Digits	C++	Note	Medium
357	Rearrange String k Distance Apart	C++	Note	None
358	Logger Rate Limiter	C++	Note	None
359	Sort Transformed Array	C++	Note	None
360	Bomb Enemy	C++	Note	None
361	Design Hit Counter	C++	Note	None
362	Max Sum of Rectangle No Larger Than K	C++	Note	Hard
363	Nested List Weight Sum II	C++	Note	None
364	Water and Jug Problem	C++	Note	Medium
365	Find Leaves of Binary Tree	C++	Note	None
366	Valid Perfect Square	C++	Note	Easy
367	Largest Divisible Subset	C++	Note	Medium
368	Plus One Linked List	C++	Note	None
369	Range Addition	C++	Note	None
370	Sum of Two Integers	C++	Note	Easy
371	Super Pow	C++	Note	Medium
372	Find K Pairs with Smallest Sums	C++	Note	Medium
373	Guess Number Higher or Lower	C++	Note	Easy
374	Guess Number Higher or Lower II	C++	Note	Medium
375	Wiggle Subsequence	C++	Note	Medium
376	Combination Sum IV	C++	Note	Medium
377	Kth Smallest Element in a Sorted Matrix	C++	Note	Medium
378	Design Phone Directory	C++	Note	None
379	Insert Delete GetRandom O(1)	C++	Note	Medium
380	Insert Delete GetRandom O(1) - Duplicates allowed	C++	Note	Hard
381	Linked List Random Node	C++	Note	Medium
382	Ransom Note	C++	Note	Easy
383	Shuffle an Array	C++	Note	Medium
384	Mini Parser	C++	Note	Medium
385	Lexicographical Numbers	C++	Note	Medium
386	First Unique Character in a String	C++	Note	Easy
387	Longest Absolute File Path	C++	Note	Medium
388	Find the Difference	C++	Note	Easy
389	Elimination Game	C++	Note	Medium
390	Perfect Rectangle	C++	Note	Hard
391	Is Subsequence	C++	Note	Medium
392	UTF-8 Validation	C++	Note	Medium
393	Decode String	C++	Note	Medium
394	Longest Substring with At Least K Repeating Characters	C++	Note	Medium
395	Rotate Function	C++	Note	Medium
396	Integer Replacement	C++	Note	Medium
397	Random Pick Index	C++	Note	Medium
398	Evaluate Division	C++	Note	Medium
399	Nth Digit	C++	Note	Easy
400	Binary Watch	C++	Note	Easy
401	Remove K Digits	C++	Note	Medium
402	Frog Jump	C++	Note	Hard
403	Sum of Left Leaves	C++	Note	Easy
404	Convert a Number to Hexadecimal	C++	Note	Easy
405	Queue Reconstruction by Height	C++	Note	Medium
406	Trapping Rain Water II	C++	Note	Hard
407	Valid Word Abbreviation	C++	Note	None
408	Longest Palindrome	C++	Note	Easy
409	Split Array Largest Sum	C++	Note	Hard
410	Minimum Unique Word Abbreviation	C++	Note	None
411	Fizz Buzz	C++	Note	Easy
412	Arithmetic Slices	C++	Note	Medium
413	Third Maximum Number	C++	Note	Easy
414	Add Strings	C++	Note	Easy
415	Partition Equal Subset Sum	C++	Note	Medium
416	Pacific Atlantic Water Flow	C++	Note	Medium
417	Sentence Screen Fitting	C++	Note	None
418	Battleships in a Board	C++	Note	Medium
419	Strong Password Checker	C++	Note	Hard
420	Maximum XOR of Two Numbers in an Array	C++	Note	Medium
421	Valid Word Square	C++	Note	None
422	Reconstruct Original Digits from English	C++	Note	Medium
423	Longest Repeating Character Replacement	C++	Note	Medium
424	Word Squares	C++	Note	None
425	All O'one Data Structure	C++	Note	Hard
426	Minimum Genetic Mutation	C++	Note	Medium
427	Number of Segments in a String	C++	Note	Easy
428	Non-overlapping Intervals	C++	Note	Medium
429	Find Right Interval	C++	Note	Medium
430	Path Sum III	C++	Note	Easy
431	Find All Anagrams in a String	C++	Note	Easy
432	Ternary Expression Parser	C++	Note	None
433	K-th Smallest in Lexicographical Order	C++	Note	Hard
434	Arranging Coins	C++	Note	Easy
435	Find All Duplicates in an Array	C++	Note	Medium
436	String Compression	C++	Note	Easy
437	Sequence Reconstruction	C++	Note	None
438	Add Two Numbers II	C++	Note	Medium
439	Arithmetic Slices II - Subsequence	C++	Note	Hard
440	Number of Boomerangs	C++	Note	Easy
441	Find All Numbers Disappeared in an Array	C++	Note	Easy
442	Serialize and Deserialize BST	C++	Note	Medium
443	Delete Node in a BST	C++	Note	Medium
444	Sort Characters By Frequency	C++	Note	Medium
445	Minimum Number of Arrows to Burst Balloons	C++	Note	Medium
446	Minimum Moves to Equal Array Elements	C++	Note	Easy
447	4Sum II	C++	Note	Medium
448	Assign Cookies	C++	Note	Easy
449	132 Pattern	C++	Note	Medium
450	Circular Array Loop	C++	Note	Medium
451	Poor Pigs	C++	Note	Easy
452	Repeated Substring Pattern	C++	Note	Easy
453	LFU Cache	C++	Note	Hard
454	Hamming Distance	C++	Note	Easy
455	Minimum Moves to Equal Array Elements II	C++	Note	Medium
456	Island Perimeter	C++	Note	Easy
457	Can I Win	C++	Note	Medium
458	Optimal Account Balancing	C++	Note	None
459	Count The Repetitions	C++	Note	Hard
460	Unique Substrings in Wraparound String	C++	Note	Medium
461	Validate IP Address	C++	Note	Medium
462	Convex Polygon	C++	Note	None
463	Encode String with Shortest Length	C++	Note	None
464	Concatenated Words	C++	Note	Hard
465	Matchsticks to Square	C++	Note	Medium
466	Ones and Zeroes	C++	Note	Medium
467	Heaters	C++	Note	Easy
468	Number Complement	C++	Note	Easy
469	Total Hamming Distance	C++	Note	Medium
470	Largest Palindrome Product	C++	Note	Easy
471	Sliding Window Median	C++	Note	Hard
472	Magical String	C++	Note	Medium
473	License Key Formatting	C++	Note	Easy
474	Smallest Good Base	C++	Note	Hard
475	Find Permutation	C++	Note	None
476	Max Consecutive Ones	C++	Note	Easy
477	Predict the Winner	C++	Note	Medium
478	Max Consecutive Ones II	C++	Note	None
479	Zuma Game	C++	Note	Hard
480	The Maze	C++	Note	None
481	Increasing Subsequences	C++	Note	Medium
482	Construct the Rectangle	C++	Note	Easy
483	Reverse Pairs	C++	Note	Hard
484	Target Sum	C++	Note	Medium
485	Teemo Attacking	C++	Note	Medium
486	Next Greater Element I	C++	Note	Easy
487	Diagonal Traverse	C++	Note	Medium
488	The Maze III	C++	Note	None
489	Keyboard Row	C++	Note	Easy
490	Find Mode in Binary Search Tree	C++	Note	Easy
491	IPO	C++	Note	Hard
492	Next Greater Element II	C++	Note	Medium
493	Base 7	C++	Note	Easy
494	The Maze II	C++	Note	None
495	Relative Ranks	C++	Note	Easy
496	Perfect Number	C++	Note	Easy
497	Most Frequent Subtree Sum	C++	Note	Medium
498	Find Bottom Left Tree Value	C++	Note	Medium
499	Freedom Trail	C++	Note	Hard
500	Find Largest Value in Each Tree Row	C++	Note	Medium
501	Longest Palindromic Subsequence	C++	Note	Medium
502	Super Washing Machines	C++	Note	Hard
503	Coin Change 2	C++	Note	Medium
504	Detect Capital	C++	Note	Easy
505	Longest Uncommon Subsequence I	C++	Note	Easy
506	Longest Uncommon Subsequence II	C++	Note	Medium
507	Continuous Subarray Sum	C++	Note	Medium
508	Longest Word in Dictionary through Deleting	C++	Note	Medium
509	Contiguous Array	C++	Note	Medium
510	Beautiful Arrangement	C++	Note	Medium
511	Word Abbreviation	C++	Note	None
512	Minesweeper	C++	Note	Medium
513	Minimum Absolute Difference in BST	C++	Note	Easy
514	Lonely Pixel I	C++	Note	None
515	K-diff Pairs in an Array	C++	Note	Easy
516	Lonely Pixel II	C++	Note	None
517	Design TinyURL	C++	Note	Medium
518	Encode and Decode TinyURL	C++	Note	Medium
519	Construct Binary Tree from String	C++	Note	None
520	Complex Number Multiplication	C++	Note	Medium
521	Convert BST to Greater Tree	C++	Note	Easy
522	Minimum Time Difference	C++	Note	Medium
523	Single Element in a Sorted Array	C++	Note	Medium
524	Reverse String II	C++	Note	Easy
525	01 Matrix	C++	Note	Medium
526	Diameter of Binary Tree	C++	Note	Easy
527	Output Contest Matches	C++	Note	None
528	Boundary of Binary Tree	C++	Note	None
529	Remove Boxes	C++	Note	Hard
530	Friend Circles	C++	Note	Medium
531	Split Array with Equal Sum	C++	Note	None
532	Binary Tree Longest Consecutive Sequence II	C++	Note	None
533	Student Attendance Record I	C++	Note	Easy
534	Student Attendance Record II	C++	Note	Hard
535	Optimal Division	C++	Note	Medium
536	Brick Wall	C++	Note	Medium
537	Split Concatenated Strings	C++	Note	None
538	Next Greater Element III	C++	Note	Medium
539	Reverse Words in a String III	C++	Note	Easy
540	Subarray Sum Equals K	C++	Note	Medium
541	Array Partition I	C++	Note	Easy
542	Longest Line of Consecutive One in Matrix	C++	Note	None
543	Binary Tree Tilt	C++	Note	Easy
544	Find the Closest Palindrome	C++	Note	Hard
545	Array Nesting	C++	Note	Medium
546	Reshape the Matrix	C++	Note	Easy
547	Permutation in String	C++	Note	Medium
548	Maximum Vacation Days	C++	Note	None
549	Median Employee Salary	C++	Note	None
550	Managers with at Least 5 Direct Reports	C++	Note	None
551	Find Median Given Frequency of Numbers	C++	Note	None
552	Subtree of Another Tree	C++	Note	Easy
553	Squirrel Simulation	C++	Note	None
554	Winning Candidate	C++	Note	None
555	Distribute Candies	C++	Note	Easy
556	Out of Boundary Paths	C++	Note	Medium
557	Employee Bonus	C++	Note	None
558	Get Highest Answer Rate Question	C++	Note	None
559	Find Cumulative Salary of an Employee	C++	Note	None
560	Count Student Number in Departments	C++	Note	None
561	Shortest Unsorted Continuous Subarray	C++	Note	Easy
562	Kill Process	C++	Note	None
563	Delete Operation for Two Strings	C++	Note	Medium
564	Find Customer Referee	C++	Note	None
565	Investments in 2016	C++	Note	None
566	Customer Placing the Largest Number of Orders	C++	Note	None
567	Erect the Fence	C++	Note	Hard
568	Design In-Memory File System	C++	Note	None
569	Tag Validator	C++	Note	Hard
570	Fraction Addition and Subtraction	C++	Note	Medium
571	Valid Square	C++	Note	Medium
572	Longest Harmonious Subsequence	C++	Note	Easy
573	Big Countries	C++	Note	Easy
574	Classes More Than 5 Students	C++	Note	Easy
575	Friend Requests I: Overall Acceptance Rate	C++	Note	None
576	Range Addition II	C++	Note	Easy
577	Minimum Index Sum of Two Lists	C++	Note	Easy
578	Non-negative Integers without Consecutive Ones	C++	Note	Hard
579	Human Traffic of Stadium	C++	Note	Hard
580	Friend Requests II: Who Has the Most Friends	C++	Note	None
581	Consecutive Available Seats	C++	Note	None
582	Design Compressed String Iterator	C++	Note	None
583	Can Place Flowers	C++	Note	Easy
584	Construct String from Binary Tree	C++	Note	Easy
585	Sales Person	C++	Note	None
586	Tree Node	C++	Note	None
587	Find Duplicate File in System	C++	Note	Medium
588	Triangle Judgement	C++	Note	None
589	Valid Triangle Number	C++	Note	Medium
590	Shortest Distance in a Plane	C++	Note	None
591	Shortest Distance in a Line	C++	Note	None
592	Second Degree Follower	C++	Note	None
593	Average Salary: Departments VS Company	C++	Note	None
594	Add Bold Tag in String	C++	Note	None
595	Merge Two Binary Trees	C++	Note	Easy
596	Students Report By Geography	C++	Note	None
597	Biggest Single Number	C++	Note	None
598	Not Boring Movies	C++	Note	Easy
599	Task Scheduler	C++	Note	Medium
600	Add One Row to Tree	C++	Note	Medium
601	Maximum Distance in Arrays	C++	Note	None
602	Minimum Factorization	C++	Note	None
603	Exchange Seats	C++	Note	Medium
604	Swap Salary	C++	Note	Easy
605	Maximum Product of Three Numbers	C++	Note	Easy
606	K Inverse Pairs Array	C++	Note	Hard
607	Course Schedule III	C++	Note	Hard
608	Design Excel Sum Formula	C++	Note	None
609	Smallest Range	C++	Note	Hard
610	Sum of Square Numbers	C++	Note	Easy
611	Find the Derangement of An Array	C++	Note	None
612	Design Log Storage System	C++	Note	None
613	Exclusive Time of Functions	C++	Note	Medium
614	Average of Levels in Binary Tree	C++	Note	Easy
615	Shopping Offers	C++	Note	Medium
616	Decode Ways II	C++	Note	Hard
617	Solve the Equation	C++	Note	Medium
618	Design Search Autocomplete System	C++	Note	None
619	Maximum Average Subarray I	C++	Note	Easy
620	Maximum Average Subarray II	C++	Note	None
621	Set Mismatch	C++	Note	Easy
622	Maximum Length of Pair Chain	C++	Note	Medium
623	Palindromic Substrings	C++	Note	Medium
624	Replace Words	C++	Note	Medium
625	Dota2 Senate	C++	Note	Medium
626	2 Keys Keyboard	C++	Note	Medium
627	4 Keys Keyboard	C++	Note	None
628	Find Duplicate Subtrees	C++	Note	Medium
629	Two Sum IV - Input is a BST	C++	Note	Easy
630	Maximum Binary Tree	C++	Note	Medium
631	Print Binary Tree	C++	Note	Medium
632	Coin Path	C++	Note	None
633	Judge Route Circle	C++	Note	Easy
634	Find K Closest Elements	C++	Note	Medium
635	Split Array into Consecutive Subsequences	C++	Note	Medium
636	Remove 9	C++	Note	None
637	Image Smoother	C++	Note	Easy
638	Maximum Width of Binary Tree	C++	Note	Medium
639	Equal Tree Partition	C++	Note	None
640	Strange Printer	C++	Note	Hard
641	Non-decreasing Array	C++	Note	Easy
642	Path Sum IV	C++	Note	None
643	Beautiful Arrangement II	C++	Note	Medium
644	Kth Smallest Number in Multiplication Table	C++	Note	Hard
645	Trim a Binary Search Tree	C++	Note	Easy
646	Maximum Swap	C++	Note	Medium
647	Second Minimum Node In a Binary Tree	C++	Note	Easy
648	Bulb Switcher II	C++	Note	Medium
649	Number of Longest Increasing Subsequence	C++	Note	Medium
650	Longest Continuous Increasing Subsequence	C++	Note	Easy
651	Cut Off Trees for Golf Event	C++	Note	Hard
652	Implement Magic Dictionary	C++	Note	Medium
653	Map Sum Pairs	C++	Note	Medium
654	Valid Parenthesis String	C++	Note	Medium
655	24 Game	C++	Note	Hard
656	Valid Palindrome II	C++	Note	Easy
657	Next Closest Time	C++	Note	None
658	Baseball Game	C++	Note	Easy
659	K Empty Slots	C++	Note	None
660	Redundant Connection	C++	Note	Medium
661	Redundant Connection II	C++	Note	Hard
662	Repeated String Match	C++	Note	Easy
663	Longest Univalue Path	C++	Note	Easy
664	Knight Probability in Chessboard	C++	Note	Medium
665	Maximum Sum of 3 Non-Overlapping Subarrays	C++	Note	Hard
666	Employee Importance	C++	Note	Easy
667	Stickers to Spell Word	C++	Note	Hard
668	Top K Frequent Words	C++	Note	Medium
669	Binary Number with Alternating Bits	C++	Note	Easy
670	Number of Distinct Islands	C++	Note	None
671	Max Area of Island	C++	Note	Easy
672	Count Binary Substrings	C++	Note	Easy
673	Degree of an Array	C++	Note	Easy
674	Partition to K Equal Sum Subsets	C++	Note	Medium
675	Falling Squares	C++	Note	Hard
676	Number of Distinct Islands II	C++	Note	None
677	Minimum ASCII Delete Sum for Two Strings	C++	Note	Medium
678	Subarray Product Less Than K	C++	Note	Medium
679	Best Time to Buy and Sell Stock with Transaction Fee	C++	Note	Medium
680	Range Module	C++	Note	Hard
681	Max Stack	C++	Note	None
682	1-bit and 2-bit Characters	C++	Note	Easy
683	Maximum Length of Repeated Subarray	C++	Note	Medium
684	Find K-th Smallest Pair Distance	C++	Note	Hard
685	Longest Word in Dictionary	C++	Note	Easy
686	Accounts Merge	C++	Note	Medium
687	Remove Comments	C++	Note	Medium
688	Candy Crush	C++	Note	None
689	Find Pivot Index	C++	Note	Easy
690	Split Linked List in Parts	C++	Note	Medium
691	Number of Atoms	C++	Note	Hard
692	Minimum Window Subsequence	C++	Note	None
693	Self Dividing Numbers	C++	Note	Easy
694	My Calendar I	C++	Note	Medium
695	Count Different Palindromic Subsequences	C++	Note	Hard
696	My Calendar II	C++	Note	Medium
697	My Calendar III	C++	Note	Hard
698	Flood Fill	C++	Note	Easy
699	Sentence Similarity	C++	Note	Easy
700	Asteroid Collision	C++	Note	Medium
701	Parse Lisp Expression	C++	Note	Hard
702	Sentence Similarity II	C++	Note	Medium
703	Monotone Increasing Digits	C++	Note	Medium
704	Daily Temperatures	C++	Note	Medium
705	Delete and Earn	C++	Note	Medium
706	Cherry Pickup	C++	Note	Hard
707	Closest Leaf in a Binary Tree	C++	Note	New
708	Network Delay Time	C++	Note	New
709	Find Smallest Letter Greater Than Target	C++	Note	New
710	Prefix and Suffix Search	C++	Note	New