| 1929 |
Concatenation of Array |
js |
Easy |
| 1920 |
Concatenation of Array |
js |
Easy |
| 1464 |
Maximum Product of Two Elements in An Array |
java java_dream |
Easy |
| 1207 |
Unique Number of Occurrences |
java_dream |
Easy |
| 1179 |
Reformat Department Table |
Mysql |
Easy |
| 1170 |
Compare Strings by Frequency of the Smallest Character |
java_dream |
Easy |
| 1137 |
N-th Tribonacci Number |
js |
Easy |
| 1071 |
Greatest Common Divisor of Strings |
|
Easy |
| 1030 |
Matrix Cells in Distance Order |
|
Easy |
| 1029 |
Two City Scheduling |
|
Easy |
| 1028 |
Recover a Tree From Preorder Traversal |
|
Hard |
| 1024 |
Video Stitching |
|
Medium |
| 993 |
Cousins in Binary Tree |
java |
Easy |
| 991 |
Broken Calculator |
|
Medium |
| 990 |
Satisfiability of Equality Equations |
|
Medium |
| 989 |
Add to Array-Form of Integer |
java_dream |
Easy |
| 988 |
Smallest String Starting From Leaf |
|
Medium |
| 987 |
Vertical Order Traversal of a Binary Tree |
|
Medium |
| 986 |
Interval List Intersections |
|
Medium |
| 985 |
Sum of Even Numbers After Queries |
|
Easy |
| 984 |
String Without AAA or BBB |
java_dream |
Easy |
| 983 |
Minimum Cost For Tickets |
|
Medium |
| 982 |
Triples with Bitwise AND Equal To Zero |
|
Hard |
| 981 |
Time Based Key-Value Store |
|
Medium |
| 980 |
Unique Paths III |
|
Hard |
| 979 |
Distribute Coins in Binary Tree |
|
Medium |
| 978 |
Longest Turbulent Subarray |
|
Medium |
| 977 |
Squares of a Sorted Array |
java_dream |
Easy |
| 976 |
Largest Perimeter Triangle |
|
Easy |
| 971 |
Flip Binary Tree To Match Preorder Traversal |
|
Medium |
| 969 |
Pancake Sorting |
|
Medium |
| 965 |
Univalued Binary Tree |
Java |
Easy |
| 961 |
N-Repeated element in size 2N Array |
|
Easy |
| 958 |
Check Completeness of a Binary Tree |
|
Medium |
| 951 |
Flip Equivalent Binary Trees |
|
Medium |
| 950 |
Reveal Cards In Increasing Order |
|
Medium |
| 941 |
Valid Mountain Array |
|
Easy |
| 933 |
Number of Recent Calls js |
|
Easy |
| 931 |
Minimum Falling Path Sum |
|
Medium |
| 929 |
Unique Email Addresses |
|
Easy |
| 922 |
Sort Array By Parity II |
|
Easy |
| 914 |
X of a Kind in a Deck of Cards |
|
Easy |
| 905 |
Sort Array By Parity |
|
Easy |
| 876 |
Middle of the Linked List |
js |
Easy |
| 859 |
Buddy Strings |
|
Easy |
| 858 |
Mirror Reflection |
|
Medium |
| 852 |
Peak Index in a Mountain Array |
|
Easy |
| 849 |
Maximize Distance to Closest Person |
|
Easy |
| 844 |
Backspace String Compare |
|
Easy |
| 837 |
Most Common Word |
|
Easy |
| 830 |
Positions of Large Groups |
|
Easy |
| 804 |
Unique Morse Code Words |
|
Easy |
| 771 |
Jewels and Stones |
|
Easy |
| 747 |
Largest Number At Least Twice of Others |
|
Easy |
| 746 |
Min Cost Climbing Stairs |
Java_dream |
Easy |
| 721 |
Accounts Merge |
|
Medium |
| 717 |
1-bit and 2-bit Characters |
|
Easy |
| 714 |
Best Time to Buy and Sell Stock with Transaction Fee |
|
Medium |
| 712 |
Minimum ASCII Sum for Two Strings |
|
Medium |
| 709 |
To Lower Case |
js |
|
| 704 |
Binary Search |
Java |
|
| 701 |
Insert Into A Binary Search Tree |
Java |
|
| 700 |
Search In A Binary Search Tree |
Java |
|
| 695 |
Max Area of Island |
|
Medium |
| 687 |
Longest Univalue Path |
|
Easy |
| 684 |
Redundant Connection |
|
Medium |
| 674 |
Longest Continuous Increasing Subsequence |
|
Easy |
| 671 |
Second Minimum Node In a Binary Tree |
|
Easy |
| 665 |
Non-decreasing Array |
Java_dream |
Easy |
| 662 |
Maximum Width of Binary Tree |
|
Medium |
| 661 |
Image Smoother |
|
Easy |
| 655 |
Print Binary Tree |
|
Medium |
| 652 |
Find Duplicate Subtrees |
|
Medium |
| 647 |
Palindromic Substrings |
|
Medium |
| 643 |
Maximum Average Subarray I |
Java_dream |
Easy |
| 628 |
Maximum Product of Three Numbers |
|
Easy |
| 627 |
Swap Salary |
Mysql |
|
| 626 |
Exchange Seats |
Mysql |
|
| 623 |
Add One Row to Tree |
|
Medium |
| 620 |
Not Boring Movies |
Mysql |
Easy |
| 617 |
Merge Two Binary Trees |
Java |
Easy |
| 595 |
Big Countries |
Mysql |
Easy |
| 581 |
Shortest Unsorted Continuous Subarray |
Java_dream |
Easy |
| 575 |
Distrubute Candies |
java |
Easy |
| 572 |
Subtree of Another Tree |
|
Easy |
| 563 |
Binary Tree Tilt |
java |
Easy |
| 547 |
Friend Circles |
|
Medium |
| 543 |
Diameter of Binary Tree |
|
Easy |
| 538 |
Convert BST to Greater Tree |
|
Easy |
| 532 |
K-diff Pairs in an Array |
|
Easy |
| 520 |
Detect Capital |
|
Easy |
| 518 |
Coin Change 2 |
|
Medium |
| 509 |
Fibonacci Number |
java |
Easy |
| 501 |
Find Mode In Binary Search Tree |
java |
Easy |
| 477 |
Total Hamming Distance |
|
Medium |
| 463 |
Island Perimeter |
|
Easy |
| 455 |
Assign Cookies |
js |
Medium |
| 450 |
NodeInABST |
|
Medium |
| 449 |
Serialize and Deserialize BST |
|
Medium |
| 438 |
Find all Anagrams in a string |
|
Medium |
| 437 |
Path Sum III |
|
Medium |
| 418 |
SentenceScreenFitting ♥ |
|
Easy |
| 417 |
Pacific Atlantic Water Flow |
js |
Medium |
| 416 |
Partition Equal Subset Sum |
|
Medium |
| 415 |
Add Strings |
|
Easy |
| 414 |
Third Maximum Number |
|
Easy |
| 413 |
Arithmetic Slices |
|
Medium |
| 412 |
Fizz Buzz |
|
Easy |
| 410 |
Split Array Largest Sum |
|
Hard |
| 409 |
Longest Palindrome |
|
Easy |
| 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 |
|
Easy |
| 395 |
Longest Substring with At Least K Repeating Characters |
|
Medium |
| 394 |
Decode String |
|
Medium |
| 393 |
UTF-8 Validation |
|
Medium |
| 392 |
Is Subsequence |
|
Medium |
| 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 |
js |
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 GetRandom O(1) - Duplicates allowed |
|
Hard |
| 380 |
Insert GetRandom O(1) |
|
Hard |
| 377 |
Combination Sum IV |
|
Medium |
| 376 |
Wiggle Subsequence |
|
Medium |
| 374 |
Guess Number Higher Or Lower |
js |
Easy |
| 371 |
Sum of Two Integers |
|
Easy |
| 367 |
Valid Perfect Square |
|
Easy |
| 357 |
Count Numbers with Unique Digits |
|
Medium |
| 350 |
Intersection of Two Arrays II |
js |
Easy |
| 349 |
Intersection of Two Arrays |
js |
Easy |
| 347 |
Top K Frequent Elements |
js |
Medium |
| 345 |
Reverse Vowels of a String |
|
Easy |
| 344 |
Reverse String java, js |
|
Easy |
| 343 |
Integer Break |
|
Medium |
| 342 |
Power of Four |
|
Easy |
| 341 |
Flatten Nested List Iterator |
|
Medium |
| 338 |
Counting Bits |
|
Medium |
| 337 |
House Robber III |
|
Medium |
| 336 |
Palindrome Pairs |
|
Hard |
| 334 |
Increasing Triplet Subsequence |
|
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 |
|
Medium |
| 328 |
Odd Even Linked List |
|
Easy |
| 327 |
Count of Range Sum |
|
Hard |
| 326 |
Power of Three |
|
Easy |
| 324 |
Wiggle Sort II |
|
Medium |
| 322 |
Coin Change |
|
Medium |
| 321 |
Create Maximum Number |
|
Hard |
| 319 |
Bulb Switcher |
|
Medium |
| 318 |
Maximum Product of Word Lengths |
|
Medium |
| 316 |
Remove Duplicate Letters |
|
Hard |
| 315 |
Count of Smaller Numbers After Self |
|
Hard |
| 313 |
Super Ugly Number |
|
Medium |
| 312 |
Burst Balloons |
|
Hard |
| 310 |
Minimum Height Trees |
|
Medium |
| 309 |
Best Time to Buy and Sell Stock with Cooldown |
|
Medium |
| 307 |
Range Sum Query - Mutable |
|
Medium |
| 306 |
Additive Number |
|
Medium |
| 304 |
Range Sum Query 2D - Immutable |
|
Medium |
| 303 |
Range Sum Query - Immutable |
|
Easy |
| 301 |
Remove Invalid Parentheses |
|
Hard |
| 300 |
Longest Increasing Subsequence |
|
Medium |
| 299 |
Bulls and Cows |
|
Easy |
| 297 |
Serialize and Deserialize Binary Tree |
|
Medium |
| 295 |
Find Median from Data Stream |
|
Hard |
| 292 |
Nim Game |
|
Easy |
| 290 |
Word Pattern |
|
Easy |
| 289 |
Game of Life |
|
Medium |
| 287 |
Find the Duplicate Number |
|
Hard |
| 285 |
Inorder Successor in BST ♥ |
|
Medium |
| 284 |
Peeking Iterator |
|
Medium |
| 283 |
Move Zeroes |
js |
Easy |
| 282 |
Expression Add Operators |
|
Hard |
| 279 |
Perfect Squares |
|
Medium |
| 278 |
First Bad Version |
|
Easy |
| 275 |
H-Index II |
|
Medium |
| 274 |
H-Index |
|
Medium |
| 273 |
Integer to English Words |
|
Medium |
| 268 |
Missing Number |
|
Medium |
| 264 |
Ugly Number II |
|
Medium |
| 263 |
Ugly Number |
|
Easy |
| 262 |
Trips and Users |
Mysql |
Hard |
| 260 |
Single Number III |
|
Medium |
| 258 |
Add Digits |
|
Easy |
| 257 |
Binary Tree Paths |
Java |
Easy |
| 242 |
Valid Anagram |
js |
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 |
Node in a Linked List |
js,java |
Easy |
| 236 |
Lowest Common Ancestor of a Binary Tree |
|
Medium |
| 235 |
Lowest Common Ancestor of a Binary Search Tree |
java |
Easy |
| 234 |
Palindrome Linked List |
java |
Easy |
| 233 |
Number of Digit One |
|
Medium |
| 232 |
Implement Queue using Stacks |
|
Easy |
| 231 |
Power of Two |
java |
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 |
java, js |
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 |
js |
Medium |
| 214 |
Shortest Palindrome |
|
Hard |
| 213 |
House Robber II |
|
Medium |
| 212 |
Word Search II |
|
Hard |
| 211 |
Add and Search Word - Data structure design |
|
Medium |
| 210 |
Course Schedule II |
|
Medium |
| 209 |
Minimum Size Subarray Sum |
|
Medium |
| 208 |
Implement Trie (Prefix Tree) |
|
Medium |
| 207 |
Course Schedule |
|
Medium |
| 206 |
Reverse Linked List |
java, js |
Easy |
| 205 |
Isomorphic Strings |
java |
Easy |
| 204 |
Count Primes |
|
Easy |
| 203 |
Remove Linked List Elements |
js,java |
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 |
js |
Easy |
| 197 |
Rising Temperature |
Mysql |
Easy |
| 196 |
Delete Duplicate Emails |
Mysql |
Easy |
| 191 |
Number of 1 Bits |
java, js |
Easy |
| 190 |
Reverse Bits |
|
Easy |
| 189 |
Rotate Array |
|
Easy |
| 188 |
Best Time to Buy and Sell Stock IV |
|
Hard |
| 187 |
Repeated DNA Sequences |
|
Medium |
| 186 |
Reverse Words in a String II ♥ |
|
Medium |
| 184 |
Department Highest Salary/ |
Mysql |
Medium |
| 183 |
Customers Who Never Order |
Mysql |
Easy |
| 182 |
Duplicate Email |
Mysql |
Easy |
| 181 |
Employees Earning More Than Their Managers |
Mysql |
Easy |
| 179 |
Largest Number |
|
Medium |
| 178 |
Ranking Scores |
Mysql |
Easy |
| 177 |
Nth Highest Salary |
Mysql |
Easy |
| 176 |
Second Highest Salary |
Mysql |
Easy |
| 175 |
Combine Two Tables |
Mysql |
Easy |
| 174 |
Dungeon Game |
|
Hard |
| 173 |
Binary Search Tree Iterator |
|
Medium |
| 172 |
Factorial Trailing Zeroes |
|
Easy |
| 171 |
Excel Sheet Column Number |
Java |
Easy |
| 170 |
Two Sum III - Data structure design ♥ |
|
Easy |
| 169 |
Majority Element |
java |
Easy |
| 168 |
Excel Sheet Column Title |
Java, js |
Easy |
| 167 |
Two Sum II - Input array is sorted ♥ |
|
Medium |
| 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 |
java, js |
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 |
js |
Hard |
| 144 |
Binary Tree Preorder Traversal |
js |
Medium |
| 143 |
Reorder List |
|
Medium |
| 142 |
Linked List Cycle II |
js |
Medium |
| 141 |
Linked List Cycle |
java, js |
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 |
java |
Medium |
| 135 |
Candy |
|
Hard |
| 134 |
Gas Station |
|
Medium |
| 133 |
Clone Graph |
js |
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 |
|
Medium |
| 126 |
Word Ladder II |
|
Hard |
| 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 |
js |
Medium |
| 121 |
Best Time to Buy and Sell Stock |
java, js |
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 |
js |
Easy |
| 111 |
Minimum Depth of Binary Tree |
js |
Easy |
| 110 |
Balanced Binary Tree |
java, js |
Easy |
| 109 |
Convert Sorted List to Binary Search Tree |
|
Medium |
| 108 |
Convert Sorted Array to Binary Search Tree |
Java, js |
Medium |
| 107 |
Binary Tree Level Order Traversal II |
|
Easy |
| 106 |
Construct Binary Tree from Inorder and Postorder Traversal |
|
Medium |
| 105 |
Construct Binary Tree from Preorder and Inorder Traversal |
|
Medium |
| 104 |
Maximum Depth of Binary Tree |
js java |
Easy |
| 103 |
Binary Tree Zigzag Level Order Traversal |
|
Medium |
| 102 |
Binary Tree Level Order Traversal |
js |
Easy |
| 101 |
Symmetric Tree |
java, js |
Easy |
| 100 |
Same Tree |
java, js |
Easy |
| 99 |
Recover Binary Search Tree |
|
Hard |
| 98 |
Validate Binary Search Tree |
|
Medium |
| 97 |
Interleaving String |
|
Hard |
| 96 |
Unique Binary Search Trees |
|
Medium |
| 95 |
Unique Binary Search Trees II |
|
Medium |
| 94 |
Binary Tree Inorder Traversal |
js |
Medium |
| 93 |
Restore IP Addresses |
|
Medium |
| 92 |
Reverse Linked List II |
|
Medium |
| 91 |
Decode Ways |
|
Medium |
| 90 |
Subsets II |
|
Medium |
| 89 |
Gray Code |
|
Medium |
| 88 |
Merge Sorted Array |
java, js |
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 |
js |
Easy |
| 82 |
Remove Duplicates from Sorted List II |
|
Medium |
| 81 |
Search in Rotated Sorted Array II |
|
Medium |
| 80 |
Remove Duplicates from Sorted Array II |
|
Medium |
| 79 |
Word Search |
|
Medium |
| 78 |
Subsets |
js |
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 |
js,java |
Easy |
| 69 |
Sqrt(x) |
|
Medium |
| 68 |
Text Justification |
|
Hard |
| 67 |
Add Binary |
java, js |
Easy |
| 66 |
Plus One |
js |
Easy |
| 65 |
Valid Number |
js |
Easy |
| 64 |
Minimum Path Sum |
|
Medium |
| 63 |
Unique Paths II |
|
Medium |
| 62 |
Unique Paths |
|
Medium |
| 61 |
Rotate List |
js |
Medium |
| 60 |
Permutation Sequence |
|
Medium |
| 59 |
Spiral Matrix II |
|
Medium |
| 58 |
Length of Last Word |
|
Easy |
| 57 |
Insert Interval |
|
Hard |
| 56 |
Merge Intervals |
|
Hard |
| 55 |
Jump Game |
|
Medium |
| 54 |
Spiral Matrix |
|
Medium |
| 53 |
Maximum Subarray |
js |
Medium |
| 52 |
N-Queens II |
|
Hard |
| 51 |
N-Queens |
|
Hard |
| 50 |
"Pow(x, n)" |
|
Medium |
| 49 |
Group Anagrams |
js |
Medium |
| 48 |
Rotate Image |
|
Medium |
| 47 |
Permutations II |
|
Hard |
| 46 |
Permutations |
js |
Medium |
| 45 |
Jump Game II |
|
Hard |
| 44 |
Wildcard Matching |
|
Hard |
| 43 |
Multiply Strings |
|
Medium |
| 42 |
Trapping Rain Water |
|
Hard |
| 41 |
First Missing Positive |
|
Hard |
| 40 |
Combination Sum II |
|
Medium |
| 39 |
Combination Sum |
|
Medium |
| 38 |
Count and Say |
|
Easy |
| 37 |
Sudoku Solver |
|
Hard |
| 36 |
Valid Sudoku |
|
Easy |
| 35 |
Search Insert Position |
js |
Easy |
| 34 |
Search for a Range |
|
Medium |
| 33 |
Search in Rotated Sorted Array |
|
Hard |
| 32 |
Longest Valid Parentheses |
|
Hard |
| 31 |
Next Permutation |
|
Medium |
| 30 |
Substring with Concatenation of All Words |
|
Hard |
| 29 |
Divide Two Integers |
|
Medium |
| 28 |
Implement strStr() |
js |
Easy |
| 27 |
Remove Element |
js python |
Easy |
| 26 |
Remove Duplicates from Sorted Array |
java, js |
Easy |
| 25 |
Reverse Nodes in k-Group |
|
Hard |
| 24 |
Swap Nodes in Pairs |
js |
Medium |
| 23 |
Merge k Sorted Lists |
js |
Hard |
| 22 |
Generate Parentheses |
js |
Medium |
| 21 |
Merge Two Sorted Lists |
java, js |
Easy |
| 20 |
Valid Parentheses |
js |
Easy |
| 19 |
Remove Nth Node From End of List |
js |
Easy |
| 18 |
4Sum |
js |
Medium |
| 17 |
Letter Combinations of a Phone Number |
js |
Medium |
| 16 |
3Sum Closest |
|
Medium |
| 15 |
3Sum |
js |
Medium |
| 14 |
Longest Common Prefix |
js |
Easy |
| 13 |
Roman to Integer |
js |
Easy |
| 12 |
Integer to Roman |
|
Medium |
| 11 |
Container With Most Water |
js |
Medium |
| 10 |
Regular Expression Matching |
|
Hard |
| 9 |
Palindrome Number |
js |
Easy |
| 8 |
String to Integer (atoi) |
|
Easy |
| 7 |
Reverse Integer |
js,java |
Easy |
| 6 |
ZigZag Conversion |
|
Easy |
| 5 |
Longest Palindromic Substring |
|
Medium |
| 4 |
Median of Two Sorted Arrays |
|
Hard |
| 3 |
Longest Substring Without Repeating Characters |
js |
Medium |
| 2 |
Add Two Numbers |
js |
Medium |
| 1 |
Two Sum |
java, js, python |
Easy |