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33 Easy244 Medium72 Hard349 total
| No. | Problem | Difficulty | Frequency |
|---|---|---|---|
| 146 | LRU Cache | Medium | |
| 200 | Number of Islands | Medium | |
| 3 | Longest Substring Without Repeating Characters | Medium | |
| 42 | Trapping Rain Water | Hard | |
| 56 | Merge Intervals | Medium | |
| 207 | Course Schedule | Medium | |
| 210 | Course Schedule II | Medium | |
| 253 | Meeting Rooms II | Medium | |
| 300 | Longest Increasing Subsequence | Medium | |
| 694 | Number of Distinct Islands | Medium | |
| 2334 | Subarray With Elements Greater Than Varying Threshold | Hard | |
| 5 | Longest Palindromic Substring | Medium | |
| 15 | 3Sum | Medium | |
| 33 | Search in Rotated Sorted Array | Medium | |
| 51 | N-Queens | Hard | |
| 54 | Spiral Matrix | Medium | |
| 68 | Text Justification | Hard | |
| 69 | Sqrt(x) | Easy | |
| 76 | Minimum Window Substring | Hard | |
| 79 | Word Search | Medium | |
| 322 | Coin Change | Medium | |
| 347 | Top K Frequent Elements | Medium | |
| 394 | Decode String | Medium | |
| 560 | Subarray Sum Equals K | Medium | |
| 1151 | Minimum Swaps to Group All 1's Together | Medium | |
| 1 | Two Sum | Easy | |
| 20 | Valid Parentheses | Easy | |
| 22 | Generate Parentheses | Medium | |
| 23 | Merge k Sorted Lists | Hard | |
| 70 | Climbing Stairs | Easy | |
| 71 | Simplify Path | Medium | |
| 72 | Edit Distance | Medium | |
| 75 | Sort Colors | Medium | |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | Medium | |
| 121 | Best Time to Buy and Sell Stock | Easy | |
| 124 | Binary Tree Maximum Path Sum | Hard | |
| 127 | Word Ladder | Hard | |
| 128 | Longest Consecutive Sequence | Medium | |
| 140 | Word Break II | Hard | |
| 143 | Reorder List | Medium | |
| 198 | House Robber | Medium | |
| 199 | Binary Tree Right Side View | Medium | |
| 2145 | Count the Hidden Sequences | Medium | |
| 206 | Reverse Linked List | Easy | |
| 215 | Kth Largest Element in an Array | Medium | |
| 224 | Basic Calculator | Hard | |
| 227 | Basic Calculator II | Medium | |
| 295 | Find Median from Data Stream | Hard | |
| 297 | Serialize and Deserialize Binary Tree | Hard | |
| 329 | Longest Increasing Path in a Matrix | Hard | |
| 380 | Insert Delete GetRandom O(1) | Medium | |
| 415 | Add Strings | Easy | |
| 2402 | Meeting Rooms III | Hard | |
| 2414 | Length of the Longest Alphabetical Continuous Substring | Medium | |
| 2456 | Most Popular Video Creator | Medium | |
| 2523 | Closest Prime Numbers in Range | Medium | |
| 2640 | Find the Score of All Prefixes of an Array | Medium | |
| 670 | Maximum Swap | Medium | |
| 678 | Valid Parenthesis String | Medium | |
| 695 | Max Area of Island | Medium | |
| 739 | Daily Temperatures | Medium | |
| 772 | Basic Calculator III | Hard | |
| 2799 | Count Complete Subarrays in an Array | Medium | |
| 706 | Design HashMap | Easy | |
| 815 | Bus Routes | Hard | |
| 827 | Making A Large Island | Hard | |
| 3086 | Minimum Moves to Pick K Ones | Hard | |
| 1405 | Longest Happy String | Medium | |
| 1293 | Shortest Path in a Grid with Obstacles Elimination | Hard | |
| 1802 | Maximum Value at a Given Index in a Bounded Array | Medium | |
| 1860 | Incremental Memory Leak | Medium | |
| 212 | Word Search II | Hard | |
| 3389 | Minimum Operations to Make Character Frequencies Equal | Hard | |
| 3441 | Minimum Cost Good Caption | Hard | |
| 3474 | Lexicographically Smallest Generated String | Hard | |
| 1146 | Snapshot Array | Medium | |
| 10 | Regular Expression Matching | Hard | |
| 11 | Container With Most Water | Medium | |
| 14 | Longest Common Prefix | Easy | |
| 25 | Reverse Nodes in k-Group | Hard | |
| 31 | Next Permutation | Medium | |
| 32 | Longest Valid Parentheses | Hard | |
| 34 | Find First and Last Position of Element in Sorted Array | Medium | |
| 39 | Combination Sum | Medium | |
| 43 | Multiply Strings | Medium | |
| 45 | Jump Game II | Medium | |
| 46 | Permutations | Medium | |
| 47 | Permutations II | Medium | |
| 49 | Group Anagrams | Medium | |
| 53 | Maximum Subarray | Medium | |
| 55 | Jump Game | Medium | |
| 64 | Minimum Path Sum | Medium | |
| 78 | Subsets | Medium | |
| 93 | Restore IP Addresses | Medium | |
| 103 | Binary Tree Zigzag Level Order Traversal | Medium | |
| 122 | Best Time to Buy and Sell Stock II | Medium | |
| 139 | Word Break | Medium | |
| 153 | Find Minimum in Rotated Sorted Array | Medium | |
| 160 | Intersection of Two Linked Lists | Easy | |
| 162 | Find Peak Element | Medium | |
| 165 | Compare Version Numbers | Medium | |
| 189 | Rotate Array | Medium | |
| 209 | Minimum Size Subarray Sum | Medium | |
| 236 | Lowest Common Ancestor of a Binary Tree | Medium | |
| 239 | Sliding Window Maximum | Hard | |
| 252 | Meeting Rooms | Easy | |
| 269 | Alien Dictionary | Hard | |
| 283 | Move Zeroes | Easy | |
| 286 | Walls and Gates | Medium | |
| 301 | Remove Invalid Parentheses | Hard | |
| 316 | Remove Duplicate Letters | Medium | |
| 378 | Kth Smallest Element in a Sorted Matrix | Medium | |
| 395 | Longest Substring with At Least K Repeating Characters | Medium | |
| 399 | Evaluate Division | Medium | |
| 403 | Frog Jump | Hard | |
| 416 | Partition Equal Subset Sum | Medium | |
| 417 | Pacific Atlantic Water Flow | Medium | |
| 2468 | Split Message Based on Limit | Hard | |
| 588 | Design In-Memory File System | Hard | |
| 735 | Asteroid Collision | Medium | |
| 426 | Convert Binary Search Tree to Sorted Doubly Linked List | Medium | |
| 767 | Reorganize String | Medium | |
| 856 | Score of Parentheses | Medium | |
| 875 | Koko Eating Bananas | Medium | |
| 528 | Random Pick with Weight | Medium | |
| 886 | Possible Bipartition | Medium | |
| 924 | Minimize Malware Spread | Hard | |
| 974 | Subarray Sums Divisible by K | Medium | |
| 994 | Rotting Oranges | Medium | |
| 1011 | Capacity To Ship Packages Within D Days | Medium | |
| 1209 | Remove All Adjacent Duplicates in String II | Medium | |
| 1249 | Minimum Remove to Make Valid Parentheses | Medium | |
| 1539 | Kth Missing Positive Number | Easy | |
| 1530 | Number of Good Leaf Nodes Pairs | Medium | |
| 3043 | Find the Length of the Longest Common Prefix | Medium | |
| 2850 | Minimum Moves to Spread Stones Over Grid | Medium | |
| 77 | Combinations | Medium | |
| 473 | Matchsticks to Square | Medium | |
| 134 | Gas Station | Medium | |
| 442 | Find All Duplicates in an Array | Medium | |
| 1071 | Greatest Common Divisor of Strings | Easy | |
| 365 | Water and Jug Problem | Medium | |
| 1584 | Min Cost to Connect All Points | Medium | |
| 934 | Shortest Bridge | Medium | |
| 1466 | Reorder Routes to Make All Paths Lead to the City Zero | Medium | |
| 902 | Numbers At Most N Given Digit Set | Hard | |
| 211 | Design Add and Search Words Data Structure | Medium | |
| 298 | Binary Tree Longest Consecutive Sequence | Medium | |
| 1248 | Count Number of Nice Subarrays | Medium | |
| 84 | Largest Rectangle in Histogram | Hard | |
| 2021 | Brightest Position on Street | Medium | |
| 581 | Shortest Unsorted Continuous Subarray | Medium | |
| 3071 | Minimum Operations to Write the Letter Y on a Grid | Medium | |
| 887 | Super Egg Drop | Hard | |
| 1462 | Course Schedule IV | Medium | |
| 845 | Longest Mountain in Array | Medium | |
| 787 | Cheapest Flights Within K Stops | Medium | |
| 12 | Integer to Roman | Medium | |
| 21 | Merge Two Sorted Lists | Easy | |
| 24 | Swap Nodes in Pairs | Medium | |
| 40 | Combination Sum II | Medium | |
| 80 | Remove Duplicates from Sorted Array II | Medium | |
| 92 | Reverse Linked List II | Medium | |
| 113 | Path Sum II | Medium | |
| 123 | Best Time to Buy and Sell Stock III | Hard | |
| 125 | Valid Palindrome | Easy | |
| 148 | Sort List | Medium | |
| 151 | Reverse Words in a String | Medium | |
| 152 | Maximum Product Subarray | Medium | |
| 159 | Longest Substring with At Most Two Distinct Characters | Medium | |
| 2096 | Step-By-Step Directions From a Binary Tree Node to Another | Medium | |
| 2115 | Find All Possible Recipes from Given Supplies | Medium | |
| 179 | Largest Number | Medium | |
| 188 | Best Time to Buy and Sell Stock IV | Hard | |
| 213 | House Robber II | Medium | |
| 221 | Maximal Square | Medium | |
| 305 | Number of Islands II | Hard | |
| 317 | Shortest Distance from All Buildings | Hard | |
| 340 | Longest Substring with At Most K Distinct Characters | Medium | |
| 348 | Design Tic-Tac-Toe | Medium | |
| 74 | Search a 2D Matrix | Medium | |
| 381 | Insert Delete GetRandom O(1) - Duplicates allowed | Hard | |
| 402 | Remove K Digits | Medium | |
| 435 | Non-overlapping Intervals | Medium | |
| 443 | String Compression | Medium | |
| 460 | LFU Cache | Hard | |
| 475 | Heaters | Medium | |
| 2422 | Merge Operations to Turn Array Into a Palindrome | Medium | |
| 518 | Coin Change II | Medium | |
| 525 | Contiguous Array | Medium | |
| 621 | Task Scheduler | Medium | |
| 642 | Design Search Autocomplete System | Hard | |
| 658 | Find K Closest Elements | Medium | |
| 662 | Maximum Width of Binary Tree | Medium | |
| 680 | Valid Palindrome II | Easy | |
| 691 | Stickers to Spell Word | Hard | |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | Medium | |
| 726 | Number of Atoms | Hard | |
| 752 | Open the Lock | Medium | |
| 785 | Is Graph Bipartite? | Medium | |
| 799 | Champagne Tower | Medium | |
| 907 | Sum of Subarray Minimums | Medium | |
| 945 | Minimum Increment to Make Array Unique | Medium | |
| 1004 | Max Consecutive Ones III | Medium | |
| 1010 | Pairs of Songs With Total Durations Divisible by 60 | Medium | |
| 1091 | Shortest Path in Binary Matrix | Medium | |
| 1143 | Longest Common Subsequence | Medium | |
| 1944 | Number of Visible People in a Queue | Hard | |
| 1268 | Search Suggestions System | Medium | |
| 1335 | Minimum Difficulty of a Job Schedule | Hard | |
| 1423 | Maximum Points You Can Obtain from Cards | Medium | |
| 1642 | Furthest Building You Can Reach | Medium | |
| 19 | Remove Nth Node From End of List | Medium | |
| 1245 | Tree Diameter | Medium | |
| 729 | My Calendar I | Medium | |
| 628 | Maximum Product of Three Numbers | Easy | |
| 909 | Snakes and Ladders | Medium | |
| 323 | Number of Connected Components in an Undirected Graph | Medium | |
| 567 | Permutation in String | Medium | |
| 650 | 2 Keys Keyboard | Medium | |
| 648 | Replace Words | Medium | |
| 135 | Candy | Hard | |
| 1813 | Sentence Similarity III | Medium | |
| 740 | Delete and Earn | Medium | |
| 716 | Max Stack | Hard | |
| 337 | House Robber III | Medium | |
| 981 | Time Based Key-Value Store | Medium | |
| 543 | Diameter of Binary Tree | Easy | |
| 962 | Maximum Width Ramp | Medium | |
| 287 | Find the Duplicate Number | Medium | |
| 63 | Unique Paths II | Medium | |
| 863 | All Nodes Distance K in Binary Tree | Medium | |
| 309 | Best Time to Buy and Sell Stock with Cooldown | Medium | |
| 2673 | Make Costs of Paths Equal in a Binary Tree | Medium | |
| 983 | Minimum Cost For Tickets | Medium | |
| 784 | Letter Case Permutation | Medium | |
| 452 | Minimum Number of Arrows to Burst Balloons | Medium | |
| 616 | Add Bold Tag in String | Medium | |
| 1044 | Longest Duplicate Substring | Hard | |
| 13 | Roman to Integer | Easy | |
| 1302 | Deepest Leaves Sum | Medium | |
| 959 | Regions Cut By Slashes | Medium | |
| 2502 | Design Memory Allocator | Medium | |
| 489 | Robot Room Cleaner | Hard | |
| 2625 | Flatten Deeply Nested Array | Medium | |
| 1669 | Merge In Between Linked Lists | Medium | |
| 721 | Accounts Merge | Medium | |
| 438 | Find All Anagrams in a String | Medium | |
| 1352 | Product of the Last K Numbers | Medium | |
| 904 | Fruit Into Baskets | Medium | |
| 48 | Rotate Image | Medium | |
| 437 | Path Sum III | Medium | |
| 428 | Serialize and Deserialize N-ary Tree | Hard | |
| 432 | All O`one Data Structure | Hard | |
| 1043 | Partition Array for Maximum Sum | Medium | |
| 2 | Add Two Numbers | Medium | |
| 4 | Median of Two Sorted Arrays | Hard | |
| 36 | Valid Sudoku | Medium | |
| 50 | Pow(x, n) | Medium | |
| 59 | Spiral Matrix II | Medium | |
| 57 | Insert Interval | Medium | |
| 62 | Unique Paths | Medium | |
| 66 | Plus One | Easy | |
| 91 | Decode Ways | Medium | |
| 96 | Unique Binary Search Trees | Medium | |
| 112 | Path Sum | Easy | |
| 2050 | Parallel Courses III | Hard | |
| 202 | Happy Number | Easy | |
| 208 | Implement Trie (Prefix Tree) | Medium | |
| 240 | Search a 2D Matrix II | Medium | |
| 259 | 3Sum Smaller | Medium | |
| 261 | Graph Valid Tree | Medium | |
| 282 | Expression Add Operators | Hard | |
| 358 | Rearrange String k Distance Apart | Hard | |
| 445 | Add Two Numbers II | Medium | |
| 468 | Validate IP Address | Medium | |
| 498 | Diagonal Traverse | Medium | |
| 2506 | Count Pairs Of Similar Strings | Easy | |
| 673 | Number of Longest Increasing Subsequence | Medium | |
| 992 | Subarrays with K Different Integers | Hard | |
| 1570 | Dot Product of Two Sparse Vectors | Medium | |
| 472 | Concatenated Words | Hard | |
| 2134 | Minimum Swaps to Group All 1's Together II | Medium | |
| 408 | Valid Word Abbreviation | Easy | |
| 377 | Combination Sum IV | Medium | |
| 2530 | Maximal Score After Applying K Operations | Medium | |
| 277 | Find the Celebrity | Medium | |
| 708 | Insert into a Sorted Circular Linked List | Medium | |
| 1769 | Minimum Number of Operations to Move All Balls to Each Box | Medium | |
| 138 | Copy List with Random Pointer | Medium | |
| 505 | The Maze II | Medium | |
| 692 | Top K Frequent Words | Medium | |
| 1216 | Valid Palindrome III | Hard | |
| 413 | Arithmetic Slices | Medium | |
| 1237 | Find Positive Integer Solution for a Given Equation | Medium | |
| 2931 | Maximum Spending After Buying Items | Hard | |
| 440 | K-th Smallest in Lexicographical Order | Hard | |
| 2561 | Rearranging Fruits | Hard | |
| 1136 | Parallel Courses | Medium | |
| 108 | Convert Sorted Array to Binary Search Tree | Easy | |
| 1383 | Maximum Performance of a Team | Hard | |
| 167 | Two Sum II - Input Array Is Sorted | Medium | |
| 1235 | Maximum Profit in Job Scheduling | Hard | |
| 230 | Kth Smallest Element in a BST | Medium | |
| 606 | Construct String from Binary Tree | Medium | |
| 2235 | Add Two Integers | Easy | |
| 2551 | Put Marbles in Bags | Hard | |
| 82 | Remove Duplicates from Sorted List II | Medium | |
| 941 | Valid Mountain Array | Easy | |
| 601 | Human Traffic of Stadium | Hard | |
| 311 | Sparse Matrix Multiplication | Medium | |
| 2694 | Event Emitter | Medium | |
| 529 | Minesweeper | Medium | |
| 593 | Valid Square | Medium | |
| 101 | Symmetric Tree | Easy | |
| 2945 | Find Maximum Non-decreasing Array Length | Hard | |
| 723 | Candy Crush | Medium | |
| 1574 | Shortest Subarray to be Removed to Make Array Sorted | Medium | |
| 2537 | Count the Number of Good Subarrays | Medium | |
| 829 | Consecutive Numbers Sum | Hard | |
| 99 | Recover Binary Search Tree | Medium | |
| 280 | Wiggle Sort | Medium | |
| 232 | Implement Queue using Stacks | Easy | |
| 496 | Next Greater Element I | Easy | |
| 271 | Encode and Decode Strings | Medium | |
| 255 | Verify Preorder Sequence in Binary Search Tree | Medium | |
| 2672 | Number of Adjacent Elements With the Same Color | Medium | |
| 679 | 24 Game | Hard | |
| 696 | Count Binary Substrings | Easy | |
| 325 | Maximum Size Subarray Sum Equals k | Medium | |
| 759 | Employee Free Time | Hard | |
| 1827 | Minimum Operations to Make the Array Increasing | Easy | |
| 400 | Nth Digit | Medium | |
| 794 | Valid Tic-Tac-Toe State | Medium | |
| 1041 | Robot Bounded In Circle | Medium | |
| 291 | Word Pattern II | Medium | |
| 698 | Partition to K Equal Sum Subsets | Medium | |
| 2817 | Minimum Absolute Difference Between Elements With Constraint | Medium | |
| 185 | Department Top Three Salaries | Hard | |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | Medium | |
| 470 | Implement Rand10() Using Rand7() | Medium | |
| 294 | Flip Game II | Medium | |
| 1676 | Lowest Common Ancestor of a Binary Tree IV | Medium | |
| 130 | Surrounded Regions | Medium | |
| 503 | Next Greater Element II | Medium | |
| 3535 | Unit Conversion II | Medium | |
| 1353 | Maximum Number of Events That Can Be Attended | Medium | |
| 918 | Maximum Sum Circular Subarray | Medium | |
| 1162 | As Far from Land as Possible | Medium |