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.idea

.idea

 
 

lib

lib

 
 

.gitignore

.gitignore

 
 

001-two-sum.cpp

001-two-sum.cpp

 
 

002-add-two-numbers.cpp

002-add-two-numbers.cpp

 
 

003-longest-substring-without-repeating-characters.cpp

003-longest-substring-without-repeating-characters.cpp

 
 

006-zigzag-conversion.cpp

006-zigzag-conversion.cpp

 
 

007-reverse-integer.cpp

007-reverse-integer.cpp

 
 

008-string-to-integer-atoi.cpp

008-string-to-integer-atoi.cpp

 
 

009-palindrome-number.cpp

009-palindrome-number.cpp

 
 

011-container-with-most-water.cpp

011-container-with-most-water.cpp

 
 

012-integer-to-roman.cpp

012-integer-to-roman.cpp

 
 

014-longest-common-prefix.cpp

014-longest-common-prefix.cpp

 
 

019-remove-nth-node-from-end-of-list.cpp

019-remove-nth-node-from-end-of-list.cpp

 
 

020-valid-parentheses.cpp

020-valid-parentheses.cpp

 
 

021-merge-two-sorted-lists.cpp

021-merge-two-sorted-lists.cpp

 
 

024-swap-nodes-in-pairs.cpp

024-swap-nodes-in-pairs.cpp

 
 

026-remove-duplicates-from-sorted-array.cpp

026-remove-duplicates-from-sorted-array.cpp

 
 

027-remove-element.cpp

027-remove-element.cpp

 
 

035-search-insert-position.cpp

035-search-insert-position.cpp

 
 

036-valid-sudoku.cpp

036-valid-sudoku.cpp

 
 

048-rotate-image.cpp

048-rotate-image.cpp

 
 

050-powx-n.cpp

050-powx-n.cpp

 
 

053-maximum-subarray.cpp

053-maximum-subarray.cpp

 
 

058-length-of-last-word.cpp

058-length-of-last-word.cpp

 
 

059-spiral-matrix-ii.cpp

059-spiral-matrix-ii.cpp

 
 

062-unique-paths.cpp

062-unique-paths.cpp

 
 

064-minimum-path-sum.cpp

064-minimum-path-sum.cpp

 
 

066-plus-one.cpp

066-plus-one.cpp

 
 

067-add-binary.cpp

067-add-binary.cpp

 
 

069-sqrtx.cpp

069-sqrtx.cpp

 
 

070-climbing-stairs.cpp

070-climbing-stairs.cpp

 
 

073-set-matrix-zeroes.cpp

073-set-matrix-zeroes.cpp

 
 

075-sort-colors.cpp

075-sort-colors.cpp

 
 

080-remove-duplicates-from-sorted-array-ii.cpp

080-remove-duplicates-from-sorted-array-ii.cpp

 
 

082-remove-duplicates-from-sorted-list-ii.cpp

082-remove-duplicates-from-sorted-list-ii.cpp

 
 

083-remove-duplicates-from-sorted-list.cpp

083-remove-duplicates-from-sorted-list.cpp

 
 

086-partition-list.cpp

086-partition-list.cpp

 
 

088-merge-sorted-array.cpp

088-merge-sorted-array.cpp

 
 

092-reverse-linked-list-ii.cpp

092-reverse-linked-list-ii.cpp

 
 

094-binary-tree-inorder-traversal.cpp

094-binary-tree-inorder-traversal.cpp

 
 

096-unique-binary-search-trees.cpp

096-unique-binary-search-trees.cpp

 
 

098-validate-binary-search-tree.cpp

098-validate-binary-search-tree.cpp

 
 

100-same-tree.cpp

100-same-tree.cpp

 
 

101-symmetric-tree.cpp

101-symmetric-tree.cpp

 
 

102-binary-tree-level-order-traversal.cpp

102-binary-tree-level-order-traversal.cpp

 
 

104-maximum-depth-of-binary-tree.cpp

104-maximum-depth-of-binary-tree.cpp

 
 

107-binary-tree-level-order-traversal-ii.cpp

107-binary-tree-level-order-traversal-ii.cpp

 
 

108-convert-sorted-array-to-binary-search-tree.cpp

108-convert-sorted-array-to-binary-search-tree.cpp

 
 

110-balanced-binary-tree.cpp

110-balanced-binary-tree.cpp

 
 

111-minimum-depth-of-binary-tree.cpp

111-minimum-depth-of-binary-tree.cpp

 
 

112-path-sum.cpp

112-path-sum.cpp

 
 

114-flatten-binary-tree-to-linked-list.cpp

114-flatten-binary-tree-to-linked-list.cpp

 
 

118-pascals-triangle.cpp

118-pascals-triangle.cpp

 
 

119-pascals-triangle-ii.cpp

119-pascals-triangle-ii.cpp

 
 

121-best-time-to-buy-and-sell-stock.cpp

121-best-time-to-buy-and-sell-stock.cpp

 
 

122-best-time-to-buy-and-sell-stock-ii.cpp

122-best-time-to-buy-and-sell-stock-ii.cpp

 
 

125-valid-palindrome.cpp

125-valid-palindrome.cpp

 
 

129-sum-root-to-leaf-numbers.cpp

129-sum-root-to-leaf-numbers.cpp

 
 

136-single-number.cpp

136-single-number.cpp

 
 

137-single-number-ii.cpp

137-single-number-ii.cpp

 
 

141-linked-list-cycle.cpp

141-linked-list-cycle.cpp

 
 

142-linked-list-cycle-ii.cpp

142-linked-list-cycle-ii.cpp

 
 

144-binary-tree-preorder-traversal.cpp

144-binary-tree-preorder-traversal.cpp

 
 

153-find-minimum-in-rotated-sorted-array.cpp

153-find-minimum-in-rotated-sorted-array.cpp

 
 

154-find-minimum-in-rotated-sorted-array-ii.cpp

154-find-minimum-in-rotated-sorted-array-ii.cpp

 
 

155-min-stack.cpp

155-min-stack.cpp

 
 

160-intersection-of-two-linked-lists.cpp

160-intersection-of-two-linked-lists.cpp

 
 

165-compare-version-numbers.cpp

165-compare-version-numbers.cpp

 
 

168-excel-sheet-column-title.cpp

168-excel-sheet-column-title.cpp

 
 

169-majority-element.cpp

169-majority-element.cpp

 
 

171-excel-sheet-column-number.cpp

171-excel-sheet-column-number.cpp

 
 

172-factorial-trailing-zeroes.cpp

172-factorial-trailing-zeroes.cpp

 
 

173-binary-search-tree-iterator.cpp

173-binary-search-tree-iterator.cpp

 
 

189-rotate-array.cpp

189-rotate-array.cpp

 
 

190-reverse-bits.cpp

190-reverse-bits.cpp

 
 

191-number-of-1-bits.cpp

191-number-of-1-bits.cpp

 
 

198-house-robber.cpp

198-house-robber.cpp

 
 

199-binary-tree-right-side-view.cpp

199-binary-tree-right-side-view.cpp

 
 

201-bitwise-and-of-numbers-range.cpp

201-bitwise-and-of-numbers-range.cpp

 
 

202-happy-number.cpp

202-happy-number.cpp

 
 

203-remove-linked-list-elements.cpp

203-remove-linked-list-elements.cpp

 
 

204-count-primes.cpp

204-count-primes.cpp

 
 

205-isomorphic-strings.cpp

205-isomorphic-strings.cpp

 
 

206-reverse-linked-list.cpp

206-reverse-linked-list.cpp

 
 

217-contains-duplicate.cpp

217-contains-duplicate.cpp

 
 

219-contains-duplicate-ii.cpp

219-contains-duplicate-ii.cpp

 
 

223-rectangle-area.cpp

223-rectangle-area.cpp

 
 

225-implement-stack-using-queues.cpp

225-implement-stack-using-queues.cpp

 
 

226-invert-binary-tree.cpp

226-invert-binary-tree.cpp

 
 

230-kth-smallest-element-in-a-bst.cpp

230-kth-smallest-element-in-a-bst.cpp

 
 

231-power-of-two.cpp

231-power-of-two.cpp

 
 

232-implement-queue-using-stacks.cpp

232-implement-queue-using-stacks.cpp

 
 

234-palindrome-linked-list.cpp

234-palindrome-linked-list.cpp

 
 

235-lowest-common-ancestor-of-a-binary-search-tree.cpp

235-lowest-common-ancestor-of-a-binary-search-tree.cpp

 
 

237-delete-node-in-a-linked-list.cpp

237-delete-node-in-a-linked-list.cpp

 
 

238-product-of-array-except-self.cpp

238-product-of-array-except-self.cpp

 
 

242-valid-anagram.cpp

242-valid-anagram.cpp

 
 

257-binary-tree-paths.cpp

257-binary-tree-paths.cpp

 
 

258-add-digits.cpp

258-add-digits.cpp

 
 

Repository files navigation

Progress

# Title Source Difficulty
✅ 001 Two Sum Source Easy
✅ 002 Add Two Numbers Source Medium
✅ 003 Longest Substring Without Repeating Characters Source Medium
004 Median of Two Sorted Arrays Hard
005 Longest Palindromic Substring Medium
✅ 006 ZigZag Conversion Source Medium
✅ 007 Reverse Integer Source Easy
✅ 008 String to Integer (atoi) Source Medium
✅ 009 Palindrome Number Source Easy
010 Regular Expression Matching Hard
✅ 011 Container With Most Water Source Medium
✅ 012 Integer to Roman Source Medium
013 Roman to Integer Easy
✅ 014 Longest Common Prefix Source Easy
015 3Sum Medium
016 3Sum Closest Medium
017 Letter Combinations of a Phone Number Medium
018 4Sum Medium
✅ 019 Remove Nth Node From End of List Source Medium
✅ 020 Valid Parentheses Source Easy
✅ 021 Merge Two Sorted Lists Source Easy
022 Generate Parentheses Medium
023 Merge k Sorted Lists Hard
✅ 024 Swap Nodes in Pairs Source Medium
025 Reverse Nodes in k-Group Hard
✅ 026 Remove Duplicates from Sorted Array Source Easy
✅ 027 Remove Element Source Easy
028 Implement strStr() Easy
029 Divide Two Integers Medium
030 Substring with Concatenation of All Words Hard
031 Next Permutation Medium
032 Longest Valid Parentheses Hard
033 Search in Rotated Sorted Array Medium
034 Search for a Range Medium
✅ 035 Search Insert Position Source Easy
✅ 036 Valid Sudoku Source Medium
037 Sudoku Solver Hard
038 Count and Say Easy
039 Combination Sum Medium
040 Combination Sum II Medium
041 First Missing Positive Hard
042 Trapping Rain Water Hard
043 Multiply Strings Medium
044 Wildcard Matching Hard
045 Jump Game II Hard
046 Permutations Medium
047 Permutations II Medium
✅ 048 Rotate Image Source Medium
049 Group Anagrams Medium
✅ 050 Pow(x, n) Source Medium
051 N-Queens Hard
052 N-Queens II Hard
✅ 053 Maximum Subarray Source Easy
054 Spiral Matrix Medium
055 Jump Game Medium
056 Merge Intervals Medium
057 Insert Interval Hard
✅ 058 Length of Last Word Source Easy
✅ 059 Spiral Matrix II Source Medium
060 Permutation Sequence Medium
061 Rotate List Medium
✅ 062 Unique Paths Source Medium
063 Unique Paths II Medium
✅ 064 Minimum Path Sum Source Medium
065 Valid Number Hard
✅ 066 Plus One Source Easy
✅ 067 Add Binary Source Easy
068 Text Justification Hard
✅ 069 Sqrt(x) Source Easy
✅ 070 Climbing Stairs Source Easy
071 Simplify Path Medium
072 Edit Distance Hard
✅ 073 Set Matrix Zeroes Source Medium
074 Search a 2D Matrix Medium
✅ 075 Sort Colors Source Medium
076 Minimum Window Substring Hard
077 Combinations Medium
078 Subsets Medium
079 Word Search Medium
✅ 080 Remove Duplicates from Sorted Array II Source Medium
081 Search in Rotated Sorted Array II Medium
✅ 082 Remove Duplicates from Sorted List II Source Medium
✅ 083 Remove Duplicates from Sorted List Source Easy
084 Largest Rectangle in Histogram Hard
085 Maximal Rectangle Hard
✅ 086 Partition List Source Medium
087 Scramble String Hard
✅ 088 Merge Sorted Array Source Easy
089 Gray Code Medium
090 Subsets II Medium
091 Decode Ways Medium
✅ 092 Reverse Linked List II Source Medium
093 Restore IP Addresses Medium
✅ 094 Binary Tree Inorder Traversal Source Medium
095 Unique Binary Search Trees II Medium
✅ 096 Unique Binary Search Trees Source Medium
097 Interleaving String Hard
✅ 098 Validate Binary Search Tree Source Medium
099 Recover Binary Search Tree Hard
✅ 100 Same Tree Source Easy
✅ 101 Symmetric Tree Source Easy
✅ 102 Binary Tree Level Order Traversal Source Medium
103 Binary Tree Zigzag Level Order Traversal Medium
✅ 104 Maximum Depth of Binary Tree Source Easy
105 Construct Binary Tree from Preorder and Inorder Traversal Medium
106 Construct Binary Tree from Inorder and Postorder Traversal Medium
✅ 107 Binary Tree Level Order Traversal II Source Easy
✅ 108 Convert Sorted Array to Binary Search Tree Source Easy
109 Convert Sorted List to Binary Search Tree Medium
✅ 110 Balanced Binary Tree Source Easy
✅ 111 Minimum Depth of Binary Tree Source Easy
✅ 112 Path Sum Source Easy
113 Path Sum II Medium
✅ 114 Flatten Binary Tree to Linked List Source Medium
115 Distinct Subsequences Hard
116 Populating Next Right Pointers in Each Node Medium
117 Populating Next Right Pointers in Each Node II Medium
✅ 118 Pascal's Triangle Source Easy
✅ 119 Pascal's Triangle II Source Easy
120 Triangle Medium
✅ 121 Best Time to Buy and Sell Stock Source Easy
✅ 122 Best Time to Buy and Sell Stock II Source Easy
123 Best Time to Buy and Sell Stock III Hard
124 Binary Tree Maximum Path Sum Hard
✅ 125 Valid Palindrome Source Easy
126 Word Ladder II Hard
127 Word Ladder Medium
128 Longest Consecutive Sequence Hard
✅ 129 Sum Root to Leaf Numbers Source Medium
130 Surrounded Regions Medium
131 Palindrome Partitioning Medium
132 Palindrome Partitioning II Hard
133 Clone Graph Medium
134 Gas Station Medium
135 Candy Hard
✅ 136 Single Number Source Easy
✅ 137 Single Number II Source Medium
138 Copy List with Random Pointer Medium
139 Word Break Medium
140 Word Break II Hard
✅ 141 Linked List Cycle Source Easy
✅ 142 Linked List Cycle II Source Medium
143 Reorder List Medium
✅ 144 Binary Tree Preorder Traversal Source Medium
145 Binary Tree Postorder Traversal Hard
146 LRU Cache Hard
147 Insertion Sort List Medium
148 Sort List Medium
149 Max Points on a Line Hard
150 Evaluate Reverse Polish Notation Medium
151 Reverse Words in a String Medium
152 Maximum Product Subarray Medium
✅ 153 Find Minimum in Rotated Sorted Array Source Medium
✅ 154 Find Minimum in Rotated Sorted Array II Source Hard
✅ 155 Min Stack Source Easy
156 Binary Tree Upside Down 🔒 Medium
157 Read N Characters Given Read4 🔒 Easy
158 Read N Characters Given Read4 II - Call multiple times 🔒 Hard
159 Longest Substring with At Most Two Distinct Characters 🔒 Hard
✅ 160 Intersection of Two Linked Lists Source Easy
161 One Edit Distance 🔒 Medium
162 Find Peak Element Medium
163 Missing Ranges 🔒 Medium
164 Maximum Gap Hard
✅ 165 Compare Version Numbers Source Medium
166 Fraction to Recurring Decimal Medium
167 Two Sum II - Input array is sorted Easy
✅ 168 Excel Sheet Column Title Source Easy
✅ 169 Majority Element Source Easy
170 Two Sum III - Data structure design 🔒 Easy
✅ 171 Excel Sheet Column Number Source Easy
✅ 172 Factorial Trailing Zeroes Source Easy
✅ 173 Binary Search Tree Iterator Source Medium
174 Dungeon Game Hard
179 Largest Number Medium
186 Reverse Words in a String II 🔒 Medium
187 Repeated DNA Sequences Medium
188 Best Time to Buy and Sell Stock IV Hard
✅ 189 Rotate Array Source Easy
✅ 190 Reverse Bits Source Easy
✅ 191 Number of 1 Bits Source Easy
✅ 198 House Robber Source Easy
✅ 199 Binary Tree Right Side View Source Medium
200 Number of Islands Medium
✅ 201 Bitwise AND of Numbers Range Source Medium
✅ 202 Happy Number Source Easy
✅ 203 Remove Linked List Elements Source Easy
✅ 204 Count Primes Source Easy
✅ 205 Isomorphic Strings Source Easy
✅ 206 Reverse Linked List Source Easy
207 Course Schedule Medium
208 Implement Trie (Prefix Tree) Medium
209 Minimum Size Subarray Sum Medium
210 Course Schedule II Medium
211 Add and Search Word - Data structure design Medium
212 Word Search II Hard
213 House Robber II Medium
214 Shortest Palindrome Hard
215 Kth Largest Element in an Array Medium
216 Combination Sum III Medium
✅ 217 Contains Duplicate Source Easy
218 The Skyline Problem Hard
✅ 219 Contains Duplicate II Source Easy
220 Contains Duplicate III Medium
221 Maximal Square Medium
222 Count Complete Tree Nodes Medium
✅ 223 Rectangle Area Source Medium
224 Basic Calculator Hard
✅ 225 Implement Stack using Queues Source Easy
✅ 226 Invert Binary Tree Source Easy
227 Basic Calculator II Medium
228 Summary Ranges Medium
229 Majority Element II Medium
✅ 230 Kth Smallest Element in a BST Source Medium
✅ 231 Power of Two Source Easy
✅ 232 Implement Queue using Stacks Source Easy
233 Number of Digit One Hard
✅ 234 Palindrome Linked List Source Easy
✅ 235 Lowest Common Ancestor of a Binary Search Tree Source Easy
236 Lowest Common Ancestor of a Binary Tree Medium
✅ 237 Delete Node in a Linked List Source Easy
✅ 238 Product of Array Except Self Source Medium
239 Sliding Window Maximum Hard
240 Search a 2D Matrix II Medium
241 Different Ways to Add Parentheses Medium
✅ 242 Valid Anagram Source Easy
243 Shortest Word Distance 🔒 Easy
244 Shortest Word Distance II 🔒 Medium
245 Shortest Word Distance III 🔒 Medium
246 Strobogrammatic Number 🔒 Easy
247 Strobogrammatic Number II 🔒 Medium
248 Strobogrammatic Number III 🔒 Hard
249 Group Shifted Strings 🔒 Medium
250 Count Univalue Subtrees 🔒 Medium
251 Flatten 2D Vector 🔒 Medium
252 Meeting Rooms 🔒 Easy
253 Meeting Rooms II 🔒 Medium
254 Factor Combinations 🔒 Medium
255 Verify Preorder Sequence in Binary Search Tree 🔒 Medium
256 Paint House 🔒 Easy
✅ 257 Binary Tree Paths Source Easy
✅ 258 Add Digits Source Easy
259 3Sum Smaller 🔒 Medium
✅ 260 Single Number III Source Medium
261 Graph Valid Tree 🔒 Medium
✅ 263 Ugly Number Source Easy
264 Ugly Number II Medium
265 Paint House II 🔒 Hard
266 Palindrome Permutation 🔒 Easy
267 Palindrome Permutation II 🔒 Medium
✅ 268 Missing Number Source Easy
269 Alien Dictionary 🔒 Hard
270 Closest Binary Search Tree Value 🔒 Easy
271 Encode and Decode Strings 🔒 Medium
272 Closest Binary Search Tree Value II 🔒 Hard
273 Integer to English Words Hard
274 H-Index Medium
275 H-Index II Medium
276 Paint Fence 🔒 Easy
277 Find the Celebrity 🔒 Medium
✅ 278 First Bad Version Source Easy
✅ 279 Perfect Squares Source Medium
280 Wiggle Sort 🔒 Medium
281 Zigzag Iterator 🔒 Medium
282 Expression Add Operators Hard
✅ 283 Move Zeroes Source Easy
284 Peeking Iterator Medium
285 Inorder Successor in BST 🔒 Medium
286 Walls and Gates 🔒 Medium
287 Find the Duplicate Number Medium
288 Unique Word Abbreviation 🔒 Medium
289 Game of Life Medium
✅ 290 Word Pattern Source Easy
291 Word Pattern II 🔒 Hard
✅ 292 Nim Game Source Easy
293 Flip Game 🔒 Easy
294 Flip Game II 🔒 Medium
295 Find Median from Data Stream Hard
296 Best Meeting Point 🔒 Hard
297 Serialize and Deserialize Binary Tree Hard
298 Binary Tree Longest Consecutive Sequence 🔒 Medium
✅ 299 Bulls and Cows Source Medium
300 Longest Increasing Subsequence Medium
301 Remove Invalid Parentheses Hard
302 Smallest Rectangle Enclosing Black Pixels 🔒 Hard
✅ 303 Range Sum Query - Immutable Source Easy
304 Range Sum Query 2D - Immutable Medium
305 Number of Islands II 🔒 Hard
306 Additive Number Medium
307 Range Sum Query - Mutable Medium
308 Range Sum Query 2D - Mutable 🔒 Hard
309 Best Time to Buy and Sell Stock with Cooldown Medium
310 Minimum Height Trees Medium
311 Sparse Matrix Multiplication 🔒 Medium
312 Burst Balloons Hard
313 Super Ugly Number Medium
314 Binary Tree Vertical Order Traversal 🔒 Medium
315 Count of Smaller Numbers After Self Hard
316 Remove Duplicate Letters Hard
317 Shortest Distance from All Buildings 🔒 Hard
✅ 318 Maximum Product of Word Lengths Source Medium
319 Bulb Switcher Medium
320 Generalized Abbreviation 🔒 Medium
321 Create Maximum Number Hard
322 Coin Change Medium
323 Number of Connected Components in an Undirected Graph 🔒 Medium
324 Wiggle Sort II Medium
325 Maximum Size Subarray Sum Equals k 🔒 Medium
✅ 326 Power of Three Source Easy
327 Count of Range Sum Hard
✅ 328 Odd Even Linked List Source Medium
329 Longest Increasing Path in a Matrix Hard
330 Patching Array Hard
331 Verify Preorder Serialization of a Binary Tree Medium
332 Reconstruct Itinerary Medium
333 Largest BST Subtree 🔒 Medium
334 Increasing Triplet Subsequence Medium
335 Self Crossing Hard
336 Palindrome Pairs Hard
337 House Robber III Medium
✅ 338 Counting Bits Source Medium
339 Nested List Weight Sum 🔒 Easy
340 Longest Substring with At Most K Distinct Characters 🔒 Hard
341 Flatten Nested List Iterator Medium
✅ 342 Power of Four Source Easy
✅ 343 Integer Break Source Medium
✅ 344 Reverse String Source Easy
✅ 345 Reverse Vowels of a String Source Easy
346 Moving Average from Data Stream 🔒 Easy
✅ 347 Top K Frequent Elements Source Medium
348 Design Tic-Tac-Toe 🔒 Medium
✅ 349 Intersection of Two Arrays Source Easy
✅ 350 Intersection of Two Arrays II Source Easy
351 Android Unlock Patterns 🔒 Medium
352 Data Stream as Disjoint Intervals Hard
353 Design Snake Game 🔒 Medium
354 Russian Doll Envelopes Hard
355 Design Twitter Medium
356 Line Reflection 🔒 Medium
✅ 357 Count Numbers with Unique Digits Source Medium
358 Rearrange String k Distance Apart 🔒 Hard
359 Logger Rate Limiter 🔒 Easy
360 Sort Transformed Array 🔒 Medium
361 Bomb Enemy 🔒 Medium
362 Design Hit Counter 🔒 Medium
363 Max Sum of Rectangle No Larger Than K Hard
364 Nested List Weight Sum II 🔒 Medium
365 Water and Jug Problem Medium
366 Find Leaves of Binary Tree 🔒 Medium
✅ 367 Valid Perfect Square Source Easy
368 Largest Divisible Subset Medium
369 Plus One Linked List 🔒 Medium
370 Range Addition 🔒 Medium
✅ 371 Sum of Two Integers Source Easy
372 Super Pow Medium
373 Find K Pairs with Smallest Sums Medium
✅ 374 Guess Number Higher or Lower Source Easy
375 Guess Number Higher or Lower II Medium
376 Wiggle Subsequence Medium
377 Combination Sum IV Medium
378 Kth Smallest Element in a Sorted Matrix Medium
379 Design Phone Directory 🔒 Medium
380 Insert Delete GetRandom O(1) Medium
381 Insert Delete GetRandom O(1) - Duplicates allowed Hard
382 Linked List Random Node Medium
383 Ransom Note Easy
384 Shuffle an Array Medium
385 Mini Parser Medium
386 Lexicographical Numbers Medium
387 First Unique Character in a String Easy
388 Longest Absolute File Path Medium
✅ 389 Find the Difference Source Easy
390 Elimination Game Medium
391 Perfect Rectangle Hard
392 Is Subsequence Medium
393 UTF-8 Validation Medium
394 Decode String Medium
395 Longest Substring with At Least K Repeating Characters Medium
396 Rotate Function Medium
397 Integer Replacement Medium
398 Random Pick Index Medium
399 Evaluate Division Medium
400 Nth Digit Easy
401 Binary Watch Easy
402 Remove K Digits Medium
403 Frog Jump Hard
404 Sum of Left Leaves Easy
405 Convert a Number to Hexadecimal Easy
406 Queue Reconstruction by Height Medium
407 Trapping Rain Water II Hard
408 Valid Word Abbreviation 🔒 Easy
409 Longest Palindrome Easy
410 Split Array Largest Sum Hard
411 Minimum Unique Word Abbreviation 🔒 Hard
412 Fizz Buzz Easy
413 Arithmetic Slices Medium
414 Third Maximum Number Easy
415 Add Strings Easy
416 Partition Equal Subset Sum Medium
417 Pacific Atlantic Water Flow Medium
418 Sentence Screen Fitting 🔒 Medium
419 Battleships in a Board Medium
420 Strong Password Checker Hard
421 Maximum XOR of Two Numbers in an Array Medium
422 Valid Word Square 🔒 Easy
423 Reconstruct Original Digits from English Medium
424 Longest Repeating Character Replacement Medium
425 Word Squares 🔒 Hard
432 All O`one Data Structure Hard
434 Number of Segments in a String Easy
435 Non-overlapping Intervals Medium
436 Find Right Interval Medium
437 Path Sum III Easy
438 Find All Anagrams in a String Easy
439 Ternary Expression Parser 🔒 Medium
440 K-th Smallest in Lexicographical Order Hard
441 Arranging Coins Easy
442 Find All Duplicates in an Array Medium
444 Sequence Reconstruction 🔒 Medium
445 Add Two Numbers II Medium
446 Arithmetic Slices II - Subsequence Hard
447 Number of Boomerangs Easy
448 Find All Numbers Disappeared in an Array Easy
449 Serialize and Deserialize BST Medium
450 Delete Node in a BST Medium
451 Sort Characters By Frequency Medium
452 Minimum Number of Arrows to Burst Balloons Medium
453 Minimum Moves to Equal Array Elements Easy
454 4Sum II Medium
455 Assign Cookies Easy
456 132 Pattern Medium
459 Repeated Substring Pattern Easy
460 LFU Cache Hard
461 Hamming Distance Easy
462 Minimum Moves to Equal Array Elements II Medium
463 Island Perimeter Easy
464 Can I Win Medium
465 Optimal Account Balancing 🔒 Hard
466 Count The Repetitions Hard
467 Unique Substrings in Wraparound String Medium
468 Validate IP Address Medium
469 Convex Polygon 🔒 Medium
471 Encode String with Shortest Length 🔒 Hard
472 Concatenated Words Hard
473 Matchsticks to Square Medium
474 Ones and Zeroes Medium
475 Heaters Easy
✅ 476 Number Complement Source Easy
477 Total Hamming Distance Medium
479 Largest Palindrome Product Easy
480 Sliding Window Median Hard
481 Magical String Medium
482 License Key Formatting Medium
483 Smallest Good Base Hard
484 Find Permutation 🔒 Medium
✅ 485 Max Consecutive Ones Source Easy
486 Predict the Winner Medium
487 Max Consecutive Ones II 🔒 Medium
488 Zuma Game Hard
490 The Maze 🔒 Medium
491 Increasing Subsequences Medium
492 Construct the Rectangle Easy
493 Reverse Pairs Hard
494 Target Sum Medium
495 Teemo Attacking Medium
496 Next Greater Element I Easy
498 Diagonal Traverse Medium
499 The Maze III 🔒 Hard
✅ 500 Keyboard Row Source Easy
501 Find Mode in Binary Search Tree Easy
502 IPO Hard
503 Next Greater Element II Medium
✅ 504 Base 7 Source Easy
505 The Maze II 🔒 Medium
506 Relative Ranks Easy
507 Perfect Number Easy
508 Most Frequent Subtree Sum Medium
513 Find Bottom Left Tree Value Medium
514 Freedom Trail Hard
515 Find Largest Value in Each Tree Row Medium
516 Longest Palindromic Subsequence Medium
517 Super Washing Machines Hard
✅ 520 Detect Capital Source Easy
521 Longest Uncommon Subsequence I Easy
522 Longest Uncommon Subsequence II Medium
523 Continuous Subarray Sum Medium
524 Longest Word in Dictionary through Deleting Medium
525 Contiguous Array Medium
526 Beautiful Arrangement Medium
527 Word Abbreviation 🔒 Hard
529 Minesweeper Medium
530 Minimum Absolute Difference in BST Easy
531 Lonely Pixel I 🔒 Medium
532 K-diff Pairs in an Array Easy
533 Lonely Pixel II 🔒 Medium
535 Encode and Decode TinyURL Medium
536 Construct Binary Tree from String 🔒 Medium
537 Complex Number Multiplication Medium
538 Convert BST to Greater Tree Easy
539 Minimum Time Difference Medium
540 Single Element in a Sorted Array Medium
541 Reverse String II Easy
542 01 Matrix Medium
543 Diameter of Binary Tree Easy
544 Output Contest Matches 🔒 Medium
545 Boundary of Binary Tree 🔒 Medium
546 Remove Boxes Hard
547 Friend Circles Medium
548 Split Array with Equal Sum 🔒 Medium
549 Binary Tree Longest Consecutive Sequence II 🔒 Medium
551 Student Attendance Record I Easy
552 Student Attendance Record II Hard
553 Optimal Division Medium
554 Brick Wall Medium
555 Split Concatenated Strings 🔒 Medium
556 Next Greater Element III Medium
557 Reverse Words in a String III Easy
560 Subarray Sum Equals K Medium
561 Array Partition I Easy
562 Longest Line of Consecutive One in Matrix 🔒 Medium
563 Binary Tree Tilt Easy
564 Find the Closest Palindrome Hard
565 Array Nesting Medium
566 Reshape the Matrix Easy
567 Permutation in String Medium
568 Maximum Vacation Days 🔒 Hard
572 Subtree of Another Tree Easy
573 Squirrel Simulation 🔒 Medium
575 Distribute Candies Easy
576 Out of Boundary Paths Medium
581 Shortest Unsorted Continuous Subarray Easy
582 Kill Process 🔒 Medium
583 Delete Operation for Two Strings Medium
587 Erect the Fence Hard
588 Design In-Memory File System 🔒 Hard
591 Tag Validator Hard
592 Fraction Addition and Subtraction Medium
593 Valid Square Medium
594 Longest Harmonious Subsequence Easy
598 Range Addition II Easy
599 Minimum Index Sum of Two Lists Easy
600 Non-negative Integers without Consecutive Ones Hard
604 Design Compressed String Iterator 🔒 Easy
605 Can Place Flowers Easy
606 Construct String from Binary Tree Easy
609 Find Duplicate File in System Medium
611 Valid Triangle Number Medium
616 Add Bold Tag in String 🔒 Medium
617 Merge Two Binary Trees Easy
621 Task Scheduler Medium
623 Add One Row to Tree Medium
624 Maximum Distance in Arrays 🔒 Easy
625 Minimum Factorization 🔒 Medium
628 Maximum Product of Three Numbers Easy
629 K Inverse Pairs Array Hard
630 Course Schedule III Medium
631 Design Excel Sum Formula 🔒 Hard
632 Smallest Range Hard
633 Sum of Square Numbers Easy
634 Find the Derangement of An Array 🔒 Medium
635 Design Log Storage System Medium
637 Average of Levels in Binary Tree Easy
638 Shopping Offers Medium
639 Decode Ways II Hard
640 Solve the Equation Medium

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