Swift 460 LFU Cache Hard Swift 448 Find All Numbers Disappeared in an Array Easy Swift 377 Combination Sum IV Medium 376 Wiggle Subsequence Medium Swift 375 Guess Number Higher or Lower II Medium 374 Guess Number Higher or Lower Easy 373 Find K Pairs with Smallest Sums Medium Swift 372 Super Pow Medium Swift 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 Swift 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 Swift 360 Sort Transformed Array ♥ Medium 359 Logger Rate Limiter ♥ Easy 358 Rearrange 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 Swift 350 Intersection of Two Arrays II Easy Swift 349 Intersection of Two Arrays Easy 348 Design Tic-Tac-Toe ♥ Medium Swift 347 Top K Frequent Elements Medium 346 Moving Average from Data Stream ♥ Easy Swift 345 Reverse Vowels of a String Easy Swift 344 Reverse String Easy Swift 343 Integer Break Medium 342 Power of Four Easy Swift 341 Flatten Nested List Iterator Medium Swift 340 Longest Substring with At Most K Distinct Characters ♥ Hard Swift 339 Nested List Weight Sum ♥ Easy Swift 338 Counting Bits Medium Swift 337 House Robber III Medium 336 Palindrome Pairs Hard 335 Self Crossing Hard Swift 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 Hard 329 Longest Increasing Path in a Matrix Hard Swift 328 Odd Even Linked List Medium 327 Count of Range Sum Hard Swift 326 Power of Three Easy Swift 325 Maximum Size Subarray Sum Equals k ♥ Medium Swift 324 Wiggle Sort II Medium Swift 323 Number of Connected Components in an Undirected Graph ♥ Medium Swift 322 Coin Change Medium Swift 321 Create Maximum Number Hard Swift 320 Generalized Abbreviation ♥ Medium 319 Bulb Switcher Medium 318 Maximum Product of Word Lengths Medium Swift 317 Shortest Distance from All Buildings ♥ Hard 316 Remove Duplicate Letters Hard 315 Count of Smaller Numbers After Self Hard Swift 314 Binary Tree Vertical Order Traversal ♥ Medium Swift 313 Super Ugly Number Medium Swift 312 Burst Balloons Hard Swift 311 Sparse Matrix Multiplication ♥ Medium 310 Minimum Height Trees Medium Swift 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 Swift 305 Number of Islands II ♥ Hard Swift 304 Range Sum Query 2D - Immutable Medium 303 Range Sum Query - Immutable Easy 302 Smallest Rectangle Enclosing Black Pixels ♥ Hard Swift 301 Remove Invalid Parentheses Hard Swift 300 Longest Increasing Subsequence Medium 299 Bulls and Cows Easy 298 Binary Tree Longest Consecutive Sequence ♥ Medium 297 Serialize and Deserialize Binary Tree Hard Swift 296 Best Meeting Point ♥ Hard 295 Find Median from Data Stream Hard Swift 294 Flip Game II ♥ Medium Swift 293 Flip Game ♥ Easy 292 Nim Game Easy 291 Word Pattern II ♥ Hard Swift 290 Word Pattern Easy Swift 289 Game of Life Medium 288 Unique Word Abbreviation ♥ Easy 287 Find the Duplicate Number Hard Swift 286 Walls and Gates ♥ Medium 285 Inorder Successor in BST ♥ Medium 284 Peeking Iterator Medium Swift 283 Move Zeroes Easy Swift 282 Expression Add Operators Hard 281 Zigzag Iterator ♥ Medium Swift 280 Wiggle Sort ♥ Medium Swift 279 Perfect Squares Medium 278 First Bad Version Easy 277 Find the Celebrity ♥ Medium Swift 276 Paint Fence ♥ Easy 275 H-Index II Medium 274 H-Index Medium Swift 273 Integer to English Words Hard Swift 272 Closest Binary Search Tree Value II ♥ Hard 271 Encode and Decode Strings ♥ Medium Swift 270 Closest Binary Search Tree Value ♥ Easy Swift 269 Alien Dictionary ♥ Hard Swift 268 Missing Number Easy 267 Palindrome Permutation II ♥ Medium Swift 266 Palindrome Permutation ♥ Easy Swift 265 Paint House II ♥ Hard Swift 264 Ugly Number II Medium Swift 263 Ugly Number Easy Swift 261 Graph Valid Tree ♥ Medium 260 Single Number III Medium 259 3Sum Smaller ♥ Medium Swift 258 Add Digits Easy Swift 257 Binary Tree Paths Easy Swift 256 Paint House ♥ Medium 255 Verify Preorder Sequence in Binary Search Tree ♥ Medium Swift 254 Factor Combinations ♥ Medium Swift 253 Meeting Rooms II ♥ Medium Swift 252 Meeting Rooms ♥ Easy Swift 251 Flatten 2D Vector ♥ Medium 250 Count Univalue Subtrees ♥ Medium 249 Group Shifted Strings ♥ Easy 248 Strobogrammatic Number III ♥ Hard Swift 247 Strobogrammatic Number II ♥ Medium Swift 246 Strobogrammatic Number ♥ Easy Swift 245 Shortest Word Distance III ♥ Medium Swift 244 Shortest Word Distance II ♥ Medium Swift 243 Shortest Word Distance ♥ Easy Swift 242 Valid Anagram Easy Swift 241 Different Ways to Add Parentheses Medium Swift 240 Search a 2D Matrix II Medium Swift 239 Sliding Window Maximum Hard Swift 238 Product of Array Except Self Medium 237 Delete Node in a Linked List Easy 236 Lowest Common Ancestor of a Binary Tree Medium Swift 235 Lowest Common Ancestor of a Binary Search Tree Easy Swift 234 Palindrome Linked List Easy 233 Number of Digit One Hard Swift 232 Implement Queue using Stacks Easy Swift 231 Power of Two Easy Swift 230 Kth Smallest Element in a BST Medium Swift 229 Majority Element II Medium Swift 228 Summary Ranges Medium 227 Basic Calculator II Medium Swift 226 Invert Binary Tree Easy 225 Implement Stack using Queues Easy Swift 224 Basic Calculator Hard Swift 223 Rectangle Area Easy 222 Count Complete Tree Nodes Medium Swift 221 Maximal Square Medium 220 Contains Duplicate III Medium Swift 219 Contains Duplicate II Easy 218 The Skyline Problem Hard Swift 217 Contains Duplicate Easy Swift 216 Combination Sum III Medium Swift 215 Kth Largest Element in an Array Medium 214 Shortest Palindrome Hard Swift 213 House Robber II Medium Swift 212 Word Search II Hard Swift 211 Add and Search Word - Data structure design Medium Swift 210 Course Schedule II Medium Swift 209 Minimum Size Subarray Sum Medium Swift 208 Implement Trie (Prefix Tree) Medium Swift 207 Course Schedule Medium Swift 206 Reverse Linked List Easy Swift 205 Isomorphic Strings Easy Swift 204 Count Primes Easy Swift 203 Remove Linked List Elements Easy Swift 202 Happy Number Easy 201 Bitwise AND of Numbers Range Medium Swift 200 Number of Islands Medium Swift 199 Binary Tree Right Side View Medium Swift 198 House Robber Easy 191 Number of 1 Bits Easy 190 Reverse Bits Easy Swift 189 Rotate Array Easy Swift 188 Best Time to Buy and Sell Stock IV Hard 187 Repeated DNA Sequences Medium Swift 186 Reverse Words in a String II ♥ Medium Swift 179 Largest Number Medium 174 Dungeon Game Hard Swift 173 Binary Search Tree Iterator Medium Swift 172 Factorial Trailing Zeroes Easy Swift 171 Excel Sheet Column Number Easy Swift 170 Two Sum III - Data structure design ♥ Easy Swift 169 Majority Element Easy 168 Excel Sheet Column Title Easy Swift 167 Two Sum II - Input array is sorted ♥ Medium Swift 166 Fraction to Recurring Decimal Medium 165 Compare Version Numbers Easy 164 Maximum Gap Hard Swift 163 Missing Ranges ♥ Medium Swift 162 Find Peak Element Medium Swift 161 One Edit Distance♥ Medium 160 Intersection of Two Linked Lists Easy Swift 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 Swift 156 Binary Tree Upside Down ♥ Medium Swift 155 Min Stack Easy Swift 154 Find Minimum in Rotated Sorted Array II Hard Swift 153 Find Minimum in Rotated Sorted Array Medium Swift 152 Maximum Product Subarray Medium Swift 151 Reverse Words in a String Medium Swift 150 Evaluate Reverse Polish Notation Medium 149 Max Points on a Line Hard 148 Sort List Medium 147 Insertion Sort List Medium Swift 146 LRU Cache Hard Swift 145 Binary Tree Postorder Traversal Hard Swift 144 Binary Tree Preorder Traversal Medium Swift 143 Reorder List Medium 142 Linked List Cycle II Medium 141 Linked List Cycle Easy 140 Word Break II Hard 139 Word Break Medium 138 Copy List with Random Pointer Hard Swift 137 Single Number II Medium Swift 136 Single Number Medium 135 Candy Hard Swift 134 Gas Station Medium 133 Clone Graph Medium 132 Palindrome Partitioning II Hard Swift 131 Palindrome Partitioning Medium 130 Surrounded Regions Medium 129 Sum Root to Leaf Numbers Medium Swift 128 Longest Consecutive Sequence Hard Swift 127 Word Ladder Medium 126 Word Ladder II Hard Swift 125 Valid Palindrome Easy Swift 124 Binary Tree Maximum Path Sum Hard Swift 123 Best Time to Buy and Sell Stock III Hard Swift 122 Best Time to Buy and Sell Stock II Medium Swift 121 Best Time to Buy and Sell Stock Easy Swift 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 Swift 114 Flatten Binary Tree to Linked List Medium Swift 113 Path Sum II Medium Swift 112 Path Sum Easy Swift 111 Minimum Depth of Binary Tree Easy Swift 110 Balanced Binary Tree Easy 109 Convert Sorted List to Binary Search Tree Medium Swift 108 Convert Sorted Array to Binary Search Tree Medium Swift 107 Binary Tree Level Order Traversal II Easy Swift 106 Construct Binary Tree from Inorder and Postorder Traversal Medium Swift 105 Construct Binary Tree from Preorder and Inorder Traversal Medium Swift 104 Maximum Depth of Binary Tree Easy Swift 103 Binary Tree Zigzag Level Order Traversal Medium Swift 102 Binary Tree Level Order Traversal Easy Swift 101 Symmetric Tree Easy Swift 100 Same Tree Easy Swift 99 Recover Binary Search Tree Hard Swift 98 Validate Binary Search Tree Medium 97 Interleaving String Hard Swift 96 Unique Binary Search Trees Medium 95 Unique Binary Search Trees II Medium Swift 94 Binary Tree Inorder Traversal Medium 93 Restore IP Addresses Medium 92 Reverse Linked List II Medium Swift 91 Decode Ways Medium Swift 90 Subsets II Medium Swift 89 Gray Code Medium Swift 88 Merge Sorted Array Easy 87 Scramble String Hard Swift 86 Partition List Medium 85 Maximal Rectangle Hard 84 Largest Rectangle in Histogram Hard Swift 83 Remove Duplicates from Sorted List Easy Swift 82 Remove Duplicates from Sorted List II Medium Swift 81 Search in Rotated Sorted Array II Medium Swift 80 Remove Duplicates from Sorted Array II Medium Swift 79 Word Search Medium Swfit 78 Subsets Medium Swift 77 Combinations Medium Swift 76 Minimum Window Substring Hard Swift 75 Sort Colors Medium Swift 74 Search a 2D Matrix Medium Swift 73 Set Matrix Zeroes Medium Swift 72 Edit Distance Hard Swift 71 Simplify Path Medium Swift 70 Climbing Stairs Easy Swift 69 Sqrt(x) Medium Swift 68 Text Justification Hard Swift 67 Add Binary Easy Swift 66 Plus One Easy Swift 65 Valid Number Hard Swift 64 Minimum Path Sum Medium Swift 63 Unique Paths II Medium Swift 62 Unique Paths Medium Swift 61 Rotate List Medium Swift 60 Permutation Sequence Medium Swift 59 Spiral Matrix II Medium Swift 58 Length of Last Word Easy Swift 57 Insert Interval Hard Swift 56 Merge Intervals Hard Swift 55 Jump Game Medium Swift 54 Spiral Matrix Medium Swift 53 Maximum Subarray Medium Swift 52 N-Queens II Hard Swift 51 N-Queens Hard Swift 50 "Pow(x, n)" Medium Swift 49 Group Anagrams Medium Swift 48 Rotate Image Medium Swift 47 Permutations II Medium Swift 46 Permutations Medium 45 Jump Game II Hard Swift 44 Wildcard Matching Hard Swift 43 Multiply Strings Medium Swift 42 Trapping Rain Water Hard Swift 41 First Missing Positive Hard Swift 40 Combination Sum II Medium Swift 39 Combination Sum Medium Swift 38 Count and Say Easy Swift 37 Sudoku Solver Hard Swift 36 Valid Sudoku Easy Swift 35 Search Insert Position Medium Swift 34 Search for a Range Medium Swift 33 Search in Rotated Sorted Array Hard Swift 32 Longest Valid Parentheses Hard Swift 31 Next Permutation Medium 30 Substring with Concatenation of All Words Hard Swift 29 Divide Two Integers Medium Swift 28 Implement strStr() Easy Swfit 27 Remove Element Easy Swift 26 Remove Duplicates from Sorted Array Easy Swift 25 Reverse Nodes in k-Group Hard Swift 24 Swap Nodes in Pairs Easy Swift 23 Merge k Sorted Lists Hard Swift 22 Generate Parentheses Medium Swift 21 Merge Two Sorted Lists Easy Swift 20 Valid Parentheses Easy Swift 19 Remove Nth Node From End of List Easy Swift 18 4Sum Medium Swift 17 Letter Combinations of a Phone Number Medium Swift 16 3Sum Closest Medium Swift 15 3Sum Medium Swift 14 Longest Common Prefix Easy Swift 13 Roman to Integer Easy Swift 12 Integer to Roman Medium Swift 11 Container With Most Water Medium Swift 10 Regular Expression Matching Hard Swift 9 Palindrome Number Easy Swift 8 String to Integer (atoi) Easy Swift 7 Reverse Integer Easy Swift 6 ZigZag Conversion Easy Swift 5 Longest Palindromic Substring Medium Swift 4 Median of Two Sorted Arrays Hard Swift 3 Longest Substring Without Repeating Characters Medium Swift 2 Add Two Numbers Medium Swift 1 Two Sum Easy