001 |
Two Sum |
Easy |
Java |
|
002 |
Add Two Numbers |
Medium |
Java |
|
003 |
Longest Substring Without Repeating Characters |
Medium |
Java |
|
004 |
Median of Two Sorted Arrays |
Hard |
Java |
|
005 |
Longest Palindromic Substring |
Medium |
Java |
|
007 |
Reverse Integer |
Easy |
Java |
|
008 |
String to Integer (atoi) |
Medium |
Java |
|
010 |
Regular Expression Matching |
Hard |
Java |
|
011 |
Container With Most Water |
Medium |
Java |
|
013 |
Roman to Integer |
Easy |
Java |
|
014 |
Longest Common Prefix |
Easy |
Java |
|
015 |
3Sum |
Medium |
Java |
|
017 |
Letter Combinations of a Phone Number |
Medium |
Java |
|
019 |
Remove Nth Node From End of List |
Easy |
Java |
|
020 |
Valid Parentheses |
Easy |
Java |
|
021 |
Merge Two Sorted Lists |
Easy |
Java |
|
022 |
Generate Parentheses |
Medium |
Java |
|
023 |
Merge k Sorted Lists |
Hard |
Java |
|
026 |
Remove Duplicates from Sorted Array |
Easy |
Java |
|
028 |
Implement strStr() |
Easy |
Java |
|
029 |
Divide Two Integers |
Medium |
Java |
|
033 |
Search in Rotated Sorted Array |
Medium |
Java |
|
034 |
Search for a Range |
Medium |
Java |
|
035 |
Search Insert Position |
Medium |
Java |
|
036 |
Valid Sudoku |
Medium |
Java |
|
038 |
Count and Say |
Easy |
Java |
|
041 |
First Missing Positive |
Hard |
Java |
|
042 |
Trapping Rain Water |
Hard |
Java |
|
044 |
Wildcard Matching |
Hard |
Java |
|
046 |
Permutations |
Medium |
Java |
|
048 |
Rotate Image |
Medium |
Java |
|
049 |
Group Anagrams |
Medium |
Java |
|
050 |
Pow(x, n) |
Medium |
Java |
|
053 |
Maximum Subarray |
Medium |
Java |
|
054 |
Spiral Matrix |
Medium |
Java |
|
055 |
Jump Game |
Medium |
Java |
|
056 |
Merge Intervals |
Medium |
Java |
|
062 |
Unique Paths |
Medium |
Java |
|
066 |
Plus One |
Easy |
Java |
|
069 |
Sqrt(x) |
Easy |
Java |
|
070 |
Climbing Stairs |
Easy |
Java |
|
073 |
Set Matrix Zeroes |
Medium |
Java |
|
075 |
Sort Colors |
Medium |
Java |
|
076 |
Minimum Window Substring |
Hard |
Java |
|
078 |
Subsets |
Medium |
Java |
|
079 |
Word Search |
Medium |
Java |
|
084 |
Largest Rectangle in Histogram |
Hard |
Java |
|
088 |
Merge Sorted Array |
Easy |
Java |
|
091 |
Decode Ways |
Medium |
Java |
|
094 |
Binary Tree Inorder Traversal |
Medium |
Java |
|
098 |
Validate Binary Search Tree |
Medium |
Java |
|
101 |
Symmetric Tree |
Easy |
Java |
|
102 |
Binary Tree Level Order Traversal |
Easy |
Java |
|
103 |
Binary Tree Zigzag Level Order Traversal |
Medium |
Java |
|
104 |
Maximum Depth of Binary Tree |
Easy |
Java |
|
105 |
Construct Binary Tree from Preorder and Inorder Traversal |
Medium |
Java |
|
108 |
Convert Sorted Array to Binary Search Tree |
Easy |
Java |
|
116 |
Populating Next Right Pointers in Each Node |
Medium |
Java |
|
118 |
Pascal’s Triangle |
Easy |
Java |
|
121 |
Best Time to Buy and Sell Stock |
Easy |
Java |
|
122 |
Best Time to Buy and Sell Stock II |
Easy |
Java |
|
124 |
Binary Tree Maximum Path Sum |
Hard |
Java |
|
125 |
Valid Palindrome |
Easy |
Java |
|
127 |
Word Ladder |
Medium |
Java |
|
128 |
Longest Consecutive Sequence |
Hard |
Java |
|
130 |
Surrounded Regions |
Medium |
Java |
|
131 |
Palindrome Partitioning |
Medium |
Java |
|
134 |
Gas Station |
Medium |
Java |
|
136 |
Single Number |
Easy |
Java |
|
138 |
Copy List with Random Pointer |
Medium |
Java |
|
139 |
Word Break |
Medium |
Java |
|
140 |
Word Break II |
Hard |
Java |
|
141 |
Linked List Cycle |
Easy |
Java |
|
146 |
LRU Cache |
Hard |
Java |
|
148 |
Sort List |
Medium |
Java |
|
149 |
Max Points on a Line |
Hard |
Java |
|
150 |
Evaluate Reverse Polish Notation |
Medium |
Java |
|
152 |
Maximum Product Subarray |
Medium |
Java |
|
155 |
Min Stack |
Easy |
Java |
|
160 |
Intersection of Two Linked Lists |
Easy |
Java |
|
162 |
Find Peak Element |
Medium |
Java |
|
163 |
Missing Ranges |
Medium |
[没权限] |
|
166 |
Fraction to Recurring Decimal |
Medium |
Java |
|
169 |
Majority Element |
Easy |
Java |
|
171 |
Excel Sheet Column Number |
Easy |
Java |
|
172 |
Factorial Trailing Zeroes |
Easy |
Java |
|
179 |
Largest Number |
Medium |
Java |
|
189 |
Rotate Array |
Easy |
Java |
|
190 |
Reverse Bits |
Easy |
Java |
|
191 |
Number of 1 Bits |
Easy |
Java |
|
198 |
House Robber |
Easy |
Java |
|
200 |
Number of Islands |
Medium |
Java |
|
202 |
Happy Number |
Easy |
Java |
|
204 |
Count Primes |
Easy |
Java |
|
206 |
Reverse Linked List |
Easy |
Java |
|
207 |
Course Schedule |
Medium |
Java |
|
208 |
Implement Trie (Prefix Tree) |
Medium |
Java |
|
210 |
Course Schedule II |
Medium |
Java |
|
212 |
Word Search II |
Hard |
Java |
|
215 |
Kth Largest Element in an Array |
Medium |
Java |
|
217 |
Contains Duplicate |
Easy |
Java |
|
218 |
The Skyline Problem |
Hard |
Java |
|
227 |
Basic Calculator II |
Medium |
Java |
|
230 |
Kth Smallest Element in a BST |
Medium |
Java |
|
234 |
Palindrome Linked List |
Easy |
Java |
|
236 |
Lowest Common Ancestor of a Binary Tree |
Medium |
Java |
|
237 |
Delete Node in a Linked List |
Easy |
Java |
|
238 |
Product of Array Except Self |
Medium |
Java |
|
239 |
Sliding Window Maximum |
Hard |
Java |
|
240 |
Search a 2D Matrix II |
Medium |
Java |
|
242 |
Valid Anagram |
Easy |
Java |
|
251 |
Flatten 2D Vector |
Medium |
[没权限] |
|
253 |
Meeting Rooms II |
Medium |
[没权限] |
|
268 |
Missing Number |
Easy |
Java |
|
269 |
Alien Dictionary |
Hard |
[没权限] |
|
277 |
Find the Celebrity |
Medium |
[没权限] |
|
279 |
Perfect Squares |
Medium |
Java |
|
283 |
Move Zeroes |
Easy |
Java |
|
285 |
Inorder Successor in BST |
Medium |
[没权限] |
|
287 |
Find the Duplicate Number |
Hard |
Java |
|
295 |
Find Median from Data Stream |
Hard |
Java |
|
297 |
Serialize and Deserialize Binary Tree |
Hard |
Java |
|
300 |
Longest Increasing Subsequence |
Medium |
Java |
|
308 |
Range Sum Query 2D - Mutable |
Medium |
[没权限] |
|
315 |
Count of Smaller Numbers After Self |
Hard |
Java |
|
322 |
Coin Change |
Medium |
Java |
|
324 |
Wiggle Sort II |
Medium |
Java |
|
326 |
Power of Three |
Easy |
Java |
|
328 |
Odd Even Linked List |
Medium |
Java |
|
329 |
Longest Increasing Path in a Matrix |
Hard |
Java |
|
334 |
Increasing Triplet Subsequence |
Medium |
Java |
|
340 |
Longest Substring with At Most K Distinct Characters |
Hard |
[Plus] |
|
341 |
Flatten Nested List Iterator |
Medium |
Java |
|
344 |
Reverse String |
Easy |
Java |
|
347 |
Top K Frequent Elements |
Medium |
Java |
|
348 |
Design Tic-Tac-Toe |
Medium |
[没权限] |
|
350 |
Intersection of Two Arrays II |
Easy |
Java |
|
371 |
Sum of Two Integers |
Medium |
Java |
|
378 |
Kth Smallest Element in a Sorted Matrix |
Medium |
Java |
|
380 |
Insert Delete GetRandom O(1) |
Medium |
Java |
|
384 |
Shuffle an Array |
Medium |
Java |
|
387 |
First Unique Character in a String |
Easy |
Java |
|
395 |
Longest Substring with At Least K Repeating Characters |
Medium |
Java |
|
412 |
Fizz Buzz |
Easy |
Java |
|
454 |
4Sum II |
Medium |
Java |
|