All companies
Bloomberg
397 Easy651 Medium165 Hard1213 total
| No. | Problem | Difficulty | Frequency |
|---|---|---|---|
| 1 | Two Sum | Easy | |
| 2 | Add Two Numbers | Medium | |
| 3 | Longest Substring Without Repeating Characters | Medium | |
| 20 | Valid Parentheses | Easy | |
| 56 | Merge Intervals | Medium | |
| 121 | Best Time to Buy and Sell Stock | Easy | |
| 200 | Number of Islands | Medium | |
| 380 | Insert Delete GetRandom O(1) | Medium | |
| 4 | Median of Two Sorted Arrays | Hard | |
| 5 | Longest Palindromic Substring | Medium | |
| 7 | Reverse Integer | Medium | |
| 9 | Palindrome Number | Easy | |
| 11 | Container With Most Water | Medium | |
| 13 | Roman to Integer | Easy | |
| 14 | Longest Common Prefix | Easy | |
| 15 | 3Sum | Medium | |
| 21 | Merge Two Sorted Lists | Easy | |
| 26 | Remove Duplicates from Sorted Array | Easy | |
| 31 | Next Permutation | Medium | |
| 33 | Search in Rotated Sorted Array | Medium | |
| 42 | Trapping Rain Water | Hard | |
| 49 | Group Anagrams | Medium | |
| 53 | Maximum Subarray | Medium | |
| 78 | Subsets | Medium | |
| 79 | Word Search | Medium | |
| 88 | Merge Sorted Array | Easy | |
| 128 | Longest Consecutive Sequence | Medium | |
| 146 | LRU Cache | Medium | |
| 155 | Min Stack | Medium | |
| 169 | Majority Element | Easy | |
| 242 | Valid Anagram | Easy | |
| 394 | Decode String | Medium | |
| 560 | Subarray Sum Equals K | Medium | |
| 430 | Flatten a Multilevel Doubly Linked List | Medium | |
| 1169 | Invalid Transactions | Medium | |
| 1396 | Design Underground System | Medium | |
| 8 | String to Integer (atoi) | Medium | |
| 18 | 4Sum | Medium | |
| 22 | Generate Parentheses | Medium | |
| 23 | Merge k Sorted Lists | Hard | |
| 27 | Remove Element | Easy | |
| 28 | Find the Index of the First Occurrence in a String | Easy | |
| 34 | Find First and Last Position of Element in Sorted Array | Medium | |
| 35 | Search Insert Position | Easy | |
| 48 | Rotate Image | Medium | |
| 50 | Pow(x, n) | Medium | |
| 54 | Spiral Matrix | Medium | |
| 55 | Jump Game | Medium | |
| 66 | Plus One | Easy | |
| 69 | Sqrt(x) | Easy | |
| 70 | Climbing Stairs | Easy | |
| 73 | Set Matrix Zeroes | Medium | |
| 75 | Sort Colors | Medium | |
| 98 | Validate Binary Search Tree | Medium | |
| 102 | Binary Tree Level Order Traversal | Medium | |
| 118 | Pascal's Triangle | Easy | |
| 125 | Valid Palindrome | Easy | |
| 131 | Palindrome Partitioning | Medium | |
| 136 | Single Number | Easy | |
| 139 | Word Break | Medium | |
| 140 | Word Break II | Hard | |
| 151 | Reverse Words in a String | Medium | |
| 162 | Find Peak Element | Medium | |
| 175 | Combine Two Tables | Easy | |
| 189 | Rotate Array | Medium | |
| 198 | House Robber | Medium | |
| 206 | Reverse Linked List | Easy | |
| 217 | Contains Duplicate | Easy | |
| 234 | Palindrome Linked List | Easy | |
| 238 | Product of Array Except Self | Medium | |
| 253 | Meeting Rooms II | Medium | |
| 283 | Move Zeroes | Easy | |
| 314 | Binary Tree Vertical Order Traversal | Medium | |
| 322 | Coin Change | Medium | |
| 387 | First Unique Character in a String | Easy | |
| 399 | Evaluate Division | Medium | |
| 424 | Longest Repeating Character Replacement | Medium | |
| 485 | Max Consecutive Ones | Easy | |
| 496 | Next Greater Element I | Easy | |
| 540 | Single Element in a Sorted Array | Medium | |
| 797 | All Paths From Source to Target | Medium | |
| 875 | Koko Eating Bananas | Medium | |
| 1029 | Two City Scheduling | Medium | |
| 1274 | Number of Ships in a Rectangle | Hard | |
| 1209 | Remove All Adjacent Duplicates in String II | Medium | |
| 1249 | Minimum Remove to Make Valid Parentheses | Medium | |
| 1387 | Sort Integers by The Power Value | Medium | |
| 1656 | Design an Ordered Stream | Easy | |
| 1752 | Check if Array Is Sorted and Rotated | Easy | |
| 2423 | Remove Letter To Equalize Frequency | Easy | |
| 2667 | Create Hello World Function | Easy | |
| 6 | Zigzag Conversion | Medium | |
| 10 | Regular Expression Matching | Hard | |
| 12 | Integer to Roman | Medium | |
| 16 | 3Sum Closest | Medium | |
| 17 | Letter Combinations of a Phone Number | Medium | |
| 19 | Remove Nth Node From End of List | Medium | |
| 24 | Swap Nodes in Pairs | Medium | |
| 25 | Reverse Nodes in k-Group | Hard | |
| 29 | Divide Two Integers | Medium | |
| 36 | Valid Sudoku | Medium | |
| 37 | Sudoku Solver | Hard | |
| 39 | Combination Sum | Medium | |
| 44 | Wildcard Matching | Hard | |
| 45 | Jump Game II | Medium | |
| 46 | Permutations | Medium | |
| 51 | N-Queens | Hard | |
| 58 | Length of Last Word | Easy | |
| 61 | Rotate List | Medium | |
| 62 | Unique Paths | Medium | |
| 63 | Unique Paths II | Medium | |
| 67 | Add Binary | Easy | |
| 72 | Edit Distance | Medium | |
| 74 | Search a 2D Matrix | Medium | |
| 81 | Search in Rotated Sorted Array II | Medium | |
| 83 | Remove Duplicates from Sorted List | Easy | |
| 84 | Largest Rectangle in Histogram | Hard | |
| 90 | Subsets II | Medium | |
| 100 | Same Tree | Easy | |
| 101 | Symmetric Tree | Easy | |
| 103 | Binary Tree Zigzag Level Order Traversal | Medium | |
| 104 | Maximum Depth of Binary Tree | Easy | |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | Medium | |
| 110 | Balanced Binary Tree | Easy | |
| 116 | Populating Next Right Pointers in Each Node | Medium | |
| 117 | Populating Next Right Pointers in Each Node II | Medium | |
| 120 | Triangle | Medium | |
| 122 | Best Time to Buy and Sell Stock II | Medium | |
| 127 | Word Ladder | Hard | |
| 134 | Gas Station | Medium | |
| 135 | Candy | Hard | |
| 138 | Copy List with Random Pointer | Medium | |
| 141 | Linked List Cycle | Easy | |
| 143 | Reorder List | Medium | |
| 150 | Evaluate Reverse Polish Notation | Medium | |
| 152 | Maximum Product Subarray | Medium | |
| 160 | Intersection of Two Linked Lists | Easy | |
| 167 | Two Sum II - Input Array Is Sorted | Medium | |
| 172 | Factorial Trailing Zeroes | Medium | |
| 197 | Rising Temperature | Easy | |
| 202 | Happy Number | Easy | |
| 205 | Isomorphic Strings | Easy | |
| 207 | Course Schedule | Medium | |
| 208 | Implement Trie (Prefix Tree) | Medium | |
| 209 | Minimum Size Subarray Sum | Medium | |
| 215 | Kth Largest Element in an Array | Medium | |
| 219 | Contains Duplicate II | Easy | |
| 230 | Kth Smallest Element in a BST | Medium | |
| 231 | Power of Two | Easy | |
| 235 | Lowest Common Ancestor of a Binary Search Tree | Medium | |
| 236 | Lowest Common Ancestor of a Binary Tree | Medium | |
| 237 | Delete Node in a Linked List | Medium | |
| 239 | Sliding Window Maximum | Hard | |
| 268 | Missing Number | Easy | |
| 274 | H-Index | Medium | |
| 287 | Find the Duplicate Number | Medium | |
| 297 | Serialize and Deserialize Binary Tree | Hard | |
| 300 | Longest Increasing Subsequence | Medium | |
| 328 | Odd Even Linked List | Medium | |
| 344 | Reverse String | Easy | |
| 345 | Reverse Vowels of a String | Easy | |
| 347 | Top K Frequent Elements | Medium | |
| 349 | Intersection of Two Arrays | Easy | |
| 386 | Lexicographical Numbers | Medium | |
| 410 | Split Array Largest Sum | Hard | |
| 416 | Partition Equal Subset Sum | Medium | |
| 443 | String Compression | Medium | |
| 445 | Add Two Numbers II | Medium | |
| 503 | Next Greater Element II | Medium | |
| 543 | Diameter of Binary Tree | Easy | |
| 547 | Number of Provinces | Medium | |
| 570 | Managers with at Least 5 Direct Reports | Medium | |
| 595 | Big Countries | Easy | |
| 611 | Valid Triangle Number | Medium | |
| 692 | Top K Frequent Words | Medium | |
| 739 | Daily Temperatures | Medium | |
| 704 | Binary Search | Easy | |
| 796 | Rotate String | Easy | |
| 852 | Peak Index in a Mountain Array | Medium | |
| 901 | Online Stock Span | Medium | |
| 912 | Sort an Array | Medium | |
| 933 | Number of Recent Calls | Easy | |
| 509 | Fibonacci Number | Easy | |
| 987 | Vertical Order Traversal of a Binary Tree | Hard | |
| 994 | Rotting Oranges | Medium | |
| 1004 | Max Consecutive Ones III | Medium | |
| 1011 | Capacity To Ship Packages Within D Days | Medium | |
| 1244 | Design A Leaderboard | Medium | |
| 1148 | Article Views I | Easy | |
| 1347 | Minimum Number of Steps to Make Two Strings Anagram | Medium | |
| 1472 | Design Browser History | Medium | |
| 1583 | Count Unhappy Friends | Medium | |
| 1614 | Maximum Nesting Depth of the Parentheses | Easy | |
| 1661 | Average Time of Process per Machine | Easy | |
| 1768 | Merge Strings Alternately | Easy | |
| 1757 | Recyclable and Low Fat Products | Easy | |
| 1823 | Find the Winner of the Circular Game | Medium | |
| 1838 | Frequency of the Most Frequent Element | Medium | |
| 176 | Second Highest Salary | Medium | |
| 1280 | Students and Examinations | Easy | |
| 30 | Substring with Concatenation of All Words | Hard | |
| 32 | Longest Valid Parentheses | Hard | |
| 38 | Count and Say | Medium | |
| 40 | Combination Sum II | Medium | |
| 41 | First Missing Positive | Hard | |
| 43 | Multiply Strings | Medium | |
| 47 | Permutations II | Medium | |
| 64 | Minimum Path Sum | Medium | |
| 71 | Simplify Path | Medium | |
| 76 | Minimum Window Substring | Hard | |
| 77 | Combinations | Medium | |
| 80 | Remove Duplicates from Sorted Array II | Medium | |
| 82 | Remove Duplicates from Sorted List II | Medium | |
| 85 | Maximal Rectangle | Hard | |
| 86 | Partition List | Medium | |
| 92 | Reverse Linked List II | Medium | |
| 94 | Binary Tree Inorder Traversal | Easy | |
| 111 | Minimum Depth of Binary Tree | Easy | |
| 113 | Path Sum II | Medium | |
| 124 | Binary Tree Maximum Path Sum | Hard | |
| 130 | Surrounded Regions | Medium | |
| 137 | Single Number II | Medium | |
| 142 | Linked List Cycle II | Medium | |
| 148 | Sort List | Medium | |
| 153 | Find Minimum in Rotated Sorted Array | Medium | |
| 158 | Read N Characters Given read4 II - Call Multiple Times | Hard | |
| 177 | Nth Highest Salary | Medium | |
| 179 | Largest Number | Medium | |
| 180 | Consecutive Numbers | Medium | |
| 181 | Employees Earning More Than Their Managers | Easy | |
| 183 | Customers Who Never Order | Easy | |
| 187 | Repeated DNA Sequences | Medium | |
| 199 | Binary Tree Right Side View | Medium | |
| 203 | Remove Linked List Elements | Easy | |
| 204 | Count Primes | Medium | |
| 210 | Course Schedule II | Medium | |
| 213 | House Robber II | Medium | |
| 224 | Basic Calculator | Hard | |
| 225 | Implement Stack using Queues | Easy | |
| 226 | Invert Binary Tree | Easy | |
| 227 | Basic Calculator II | Medium | |
| 228 | Summary Ranges | Easy | |
| 229 | Majority Element II | Medium | |
| 232 | Implement Queue using Stacks | Easy | |
| 240 | Search a 2D Matrix II | Medium | |
| 241 | Different Ways to Add Parentheses | Medium | |
| 258 | Add Digits | Easy | |
| 266 | Palindrome Permutation | Easy | |
| 278 | First Bad Version | Easy | |
| 279 | Perfect Squares | Medium | |
| 295 | Find Median from Data Stream | Hard | |
| 303 | Range Sum Query - Immutable | Easy | |
| 311 | Sparse Matrix Multiplication | Medium | |
| 316 | Remove Duplicate Letters | Medium | |
| 334 | Increasing Triplet Subsequence | Medium | |
| 362 | Design Hit Counter | Medium | |
| 371 | Sum of Two Integers | Medium | |
| 383 | Ransom Note | Easy | |
| 389 | Find the Difference | Easy | |
| 392 | Is Subsequence | Easy | |
| 402 | Remove K Digits | Medium | |
| 412 | Fizz Buzz | Easy | |
| 435 | Non-overlapping Intervals | Medium | |
| 441 | Arranging Coins | Easy | |
| 450 | Delete Node in a BST | Medium | |
| 451 | Sort Characters By Frequency | Medium | |
| 455 | Assign Cookies | Easy | |
| 456 | 132 Pattern | Medium | |
| 493 | Reverse Pairs | Hard | |
| 494 | Target Sum | Medium | |
| 523 | Continuous Subarray Sum | Medium | |
| 525 | Contiguous Array | Medium | |
| 541 | Reverse String II | Easy | |
| 1730 | Shortest Path to Get Food | Medium | |
| 556 | Next Greater Element III | Medium | |
| 567 | Permutation in String | Medium | |
| 577 | Employee Bonus | Easy | |
| 582 | Kill Process | Medium | |
| 584 | Find Customer Referee | Easy | |
| 626 | Exchange Seats | Medium | |
| 642 | Design Search Autocomplete System | Hard | |
| 643 | Maximum Average Subarray I | Easy | |
| 645 | Set Mismatch | Easy | |
| 662 | Maximum Width of Binary Tree | Medium | |
| 669 | Trim a Binary Search Tree | Medium | |
| 676 | Implement Magic Dictionary | Medium | |
| 678 | Valid Parenthesis String | Medium | |
| 684 | Redundant Connection | Medium | |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | Medium | |
| 721 | Accounts Merge | Medium | |
| 724 | Find Pivot Index | Easy | |
| 733 | Flood Fill | Easy | |
| 735 | Asteroid Collision | Medium | |
| 749 | Contain Virus | Hard | |
| 860 | Lemonade Change | Easy | |
| 876 | Middle of the Linked List | Easy | |
| 881 | Boats to Save People | Medium | |
| 907 | Sum of Subarray Minimums | Medium | |
| 930 | Binary Subarrays With Sum | Medium | |
| 974 | Subarray Sums Divisible by K | Medium | |
| 977 | Squares of a Sorted Array | Easy | |
| 993 | Cousins in Binary Tree | Easy | |
| 1021 | Remove Outermost Parentheses | Easy | |
| 1071 | Greatest Common Divisor of Strings | Easy | |
| 1091 | Shortest Path in Binary Matrix | Medium | |
| 1095 | Find in Mountain Array | Hard | |
| 1104 | Path In Zigzag Labelled Binary Tree | Medium | |
| 1143 | Longest Common Subsequence | Medium | |
| 1174 | Immediate Food Delivery II | Medium | |
| 1200 | Minimum Absolute Difference | Easy | |
| 1193 | Monthly Transactions I | Medium | |
| 1207 | Unique Number of Occurrences | Easy | |
| 1211 | Queries Quality and Percentage | Easy | |
| 1235 | Maximum Profit in Job Scheduling | Hard | |
| 1251 | Average Selling Price | Easy | |
| 1358 | Number of Substrings Containing All Three Characters | Medium | |
| 1378 | Replace Employee ID With The Unique Identifier | Easy | |
| 1478 | Allocate Mailboxes | Hard | |
| 1480 | Running Sum of 1d Array | Easy | |
| 1482 | Minimum Number of Days to Make m Bouquets | Medium | |
| 1539 | Kth Missing Positive Number | Easy | |
| 1570 | Dot Product of Two Sparse Vectors | Medium | |
| 1609 | Even Odd Tree | Medium | |
| 1636 | Sort Array by Increasing Frequency | Easy | |
| 1816 | Truncate Sentence | Easy | |
| 1820 | Maximum Number of Accepted Invitations | Medium | |
| 1893 | Check if All the Integers in a Range Are Covered | Easy | |
| 1920 | Build Array from Permutation | Easy | |
| 1922 | Count Good Numbers | Medium | |
| 1929 | Concatenation of Array | Easy | |
| 1934 | Confirmation Rate | Medium | |
| 1971 | Find if Path Exists in Graph | Easy | |
| 2035 | Partition Array Into Two Arrays to Minimize Sum Difference | Hard | |
| 2149 | Rearrange Array Elements by Sign | Medium | |
| 2235 | Add Two Integers | Easy | |
| 2515 | Shortest Distance to Target String in a Circular Array | Easy | |
| 1070 | Product Sales Analysis III | Medium | |
| 1365 | How Many Numbers Are Smaller Than the Current Number | Easy | |
| 214 | Shortest Palindrome | Hard | |
| 233 | Number of Digit One | Hard | |
| 114 | Flatten Binary Tree to Linked List | Medium | |
| 1164 | Product Price at a Given Date | Medium | |
| 2965 | Find Missing and Repeated Values | Easy | |
| 670 | Maximum Swap | Medium | |
| 438 | Find All Anagrams in a String | Medium | |
| 2461 | Maximum Sum of Distinct Subarrays With Length K | Medium | |
| 904 | Fruit Into Baskets | Medium | |
| 326 | Power of Three | Easy | |
| 97 | Interleaving String | Medium | |
| 1079 | Letter Tile Possibilities | Medium | |
| 2161 | Partition Array According to Given Pivot | Medium | |
| 60 | Permutation Sequence | Hard | |
| 498 | Diagonal Traverse | Medium | |
| 771 | Jewels and Stones | Easy | |
| 869 | Reordered Power of 2 | Medium | |
| 182 | Duplicate Emails | Easy | |
| 52 | N-Queens II | Hard | |
| 57 | Insert Interval | Medium | |
| 68 | Text Justification | Hard | |
| 91 | Decode Ways | Medium | |
| 99 | Recover Binary Search Tree | Medium | |
| 108 | Convert Sorted Array to Binary Search Tree | Easy | |
| 112 | Path Sum | Easy | |
| 115 | Distinct Subsequences | Hard | |
| 123 | Best Time to Buy and Sell Stock III | Hard | |
| 126 | Word Ladder II | Hard | |
| 129 | Sum Root to Leaf Numbers | Medium | |
| 133 | Clone Graph | Medium | |
| 144 | Binary Tree Preorder Traversal | Easy | |
| 145 | Binary Tree Postorder Traversal | Easy | |
| 149 | Max Points on a Line | Hard | |
| 168 | Excel Sheet Column Title | Easy | |
| 173 | Binary Search Tree Iterator | Medium | |
| 185 | Department Top Three Salaries | Hard | |
| 211 | Design Add and Search Words Data Structure | Medium | |
| 222 | Count Complete Tree Nodes | Easy | |
| 260 | Single Number III | Medium | |
| 263 | Ugly Number | Easy | |
| 264 | Ugly Number II | Medium | |
| 290 | Word Pattern | Easy | |
| 308 | Range Sum Query 2D - Mutable | Medium | |
| 315 | Count of Smaller Numbers After Self | Hard | |
| 332 | Reconstruct Itinerary | Hard | |
| 338 | Counting Bits | Easy | |
| 350 | Intersection of Two Arrays II | Easy | |
| 367 | Valid Perfect Square | Easy | |
| 368 | Largest Divisible Subset | Medium | |
| 374 | Guess Number Higher or Lower | Easy | |
| 390 | Elimination Game | Medium | |
| 405 | Convert a Number to Hexadecimal | Easy | |
| 409 | Longest Palindrome | Easy | |
| 414 | Third Maximum Number | Easy | |
| 442 | Find All Duplicates in an Array | Medium | |
| 448 | Find All Numbers Disappeared in an Array | Easy | |
| 452 | Minimum Number of Arrows to Burst Balloons | Medium | |
| 459 | Repeated Substring Pattern | Easy | |
| 463 | Island Perimeter | Easy | |
| 502 | IPO | Hard | |
| 506 | Relative Ranks | Easy | |
| 515 | Find Largest Value in Each Tree Row | Medium | |
| 518 | Coin Change II | Medium | |
| 539 | Minimum Time Difference | Medium | |
| 542 | 01 Matrix | Medium | |
| 561 | Array Partition | Easy | |
| 605 | Can Place Flowers | Easy | |
| 610 | Triangle Judgement | Easy | |
| 620 | Not Boring Movies | Easy | |
| 621 | Task Scheduler | Medium | |
| 628 | Maximum Product of Three Numbers | Easy | |
| 633 | Sum of Square Numbers | Medium | |
| 647 | Palindromic Substrings | Medium | |
| 658 | Find K Closest Elements | Medium | |
| 680 | Valid Palindrome II | Easy | |
| 695 | Max Area of Island | Medium | |
| 713 | Subarray Product Less Than K | Medium | |
| 723 | Candy Crush | Medium | |
| 743 | Network Delay Time | Medium | |
| 746 | Min Cost Climbing Stairs | Easy | |
| 767 | Reorganize String | Medium | |
| 787 | Cheapest Flights Within K Stops | Medium | |
| 802 | Find Eventual Safe States | Medium | |
| 827 | Making A Large Island | Hard | |
| 853 | Car Fleet | Medium | |
| 867 | Transpose Matrix | Easy | |
| 905 | Sort Array By Parity | Easy | |
| 909 | Snakes and Ladders | Medium | |
| 921 | Minimum Add to Make Parentheses Valid | Medium | |
| 981 | Time Based Key-Value Store | Medium | |
| 1002 | Find Common Characters | Easy | |
| 1009 | Complement of Base 10 Integer | Easy | |
| 1020 | Number of Enclaves | Medium | |
| 1043 | Partition Array for Maximum Sum | Medium | |
| 1047 | Remove All Adjacent Duplicates In String | Easy | |
| 1108 | Defanging an IP Address | Easy | |
| 1190 | Reverse Substrings Between Each Pair of Parentheses | Medium | |
| 1192 | Critical Connections in a Network | Hard | |
| 1204 | Last Person to Fit in the Bus | Medium | |
| 1248 | Count Number of Nice Subarrays | Medium | |
| 1283 | Find the Smallest Divisor Given a Threshold | Medium | |
| 1346 | Check If N and Its Double Exist | Easy | |
| 1351 | Count Negative Numbers in a Sorted Matrix | Easy | |
| 1431 | Kids With the Greatest Number of Candies | Easy | |
| 1470 | Shuffle the Array | Easy | |
| 1498 | Number of Subsequences That Satisfy the Given Sum Condition | Medium | |
| 1512 | Number of Good Pairs | Easy | |
| 1547 | Minimum Cost to Cut a Stick | Hard | |
| 1581 | Customer Who Visited but Did Not Make Any Transactions | Easy | |
| 1679 | Max Number of K-Sum Pairs | Medium | |
| 1700 | Number of Students Unable to Eat Lunch | Easy | |
| 1732 | Find the Highest Altitude | Easy | |
| 1731 | The Number of Employees Which Report to Each Employee | Easy | |
| 1832 | Check if the Sentence Is Pangram | Easy | |
| 1903 | Largest Odd Number in String | Easy | |
| 1901 | Find a Peak Element II | Medium | |
| 2560 | House Robber IV | Medium | |
| 2620 | Counter | Easy | |
| 2769 | Find the Maximum Achievable Number | Easy | |
| 2877 | Create a DataFrame from List | Easy | |
| 3110 | Score of a String | Easy | |
| 1304 | Find N Unique Integers Sum up to Zero | Easy | |
| 1978 | Employees Whose Manager Left the Company | Easy | |
| 719 | Find K-th Smallest Pair Distance | Hard | |
| 1910 | Remove All Occurrences of a Substring | Medium | |
| 1341 | Movie Rating | Medium | |
| 2619 | Array Prototype Last | Easy | |
| 947 | Most Stones Removed with Same Row or Column | Medium | |
| 2104 | Sum of Subarray Ranges | Medium | |
| 550 | Game Play Analysis IV | Medium | |
| 989 | Add to Array-Form of Integer | Easy | |
| 1045 | Customers Who Bought All Products | Medium | |
| 632 | Smallest Range Covering Elements from K Lists | Hard | |
| 1683 | Invalid Tweets | Easy | |
| 2239 | Find Closest Number to Zero | Easy | |
| 594 | Longest Harmonious Subsequence | Easy | |
| 1331 | Rank Transform of an Array | Easy | |
| 962 | Maximum Width Ramp | Medium | |
| 1423 | Maximum Points You Can Obtain from Cards | Medium | |
| 1094 | Car Pooling | Medium | |
| 765 | Couples Holding Hands | Hard | |
| 381 | Insert Delete GetRandom O(1) - Duplicates allowed | Hard | |
| 602 | Friend Requests II: Who Has the Most Friends | Medium | |
| 190 | Reverse Bits | Easy | |
| 2563 | Count the Number of Fair Pairs | Medium | |
| 1574 | Shortest Subarray to be Removed to Make Array Sorted | Medium | |
| 282 | Expression Add Operators | Hard | |
| 196 | Delete Duplicate Emails | Easy | |
| 1760 | Minimum Limit of Balls in a Bag | Medium | |
| 3381 | Maximum Subarray Sum With Length Divisible by K | Medium | |
| 1652 | Defuse the Bomb | Easy | |
| 653 | Two Sum IV - Input is a BST | Easy | |
| 1941 | Check if All Characters Have Equal Number of Occurrences | Easy | |
| 1014 | Best Sightseeing Pair | Medium | |
| 3405 | Count the Number of Arrays with K Matching Adjacent Elements | Hard | |
| 2634 | Filter Elements from Array | Easy | |
| 992 | Subarrays with K Different Integers | Hard | |
| 1930 | Unique Length-3 Palindromic Subsequences | Medium | |
| 1789 | Primary Department for Each Employee | Easy | |
| 983 | Minimum Cost For Tickets | Medium | |
| 1295 | Find Numbers with Even Number of Digits | Easy | |
| 2657 | Find the Prefix Common Array of Two Arrays | Medium | |
| 475 | Heaters | Medium | |
| 428 | Serialize and Deserialize N-ary Tree | Hard | |
| 3105 | Longest Strictly Increasing or Strictly Decreasing Subarray | Easy | |
| 1726 | Tuple with Same Product | Medium | |
| 3174 | Clear Digits | Easy | |
| 1019 | Next Greater Node In Linked List | Medium | |
| 2342 | Max Sum of a Pair With Equal Sum of Digits | Medium | |
| 2698 | Find the Punishment Number of an Integer | Medium | |
| 1781 | Sum of Beauty of All Substrings | Medium | |
| 1415 | The k-th Lexicographical String of All Happy Strings of Length n | Medium | |
| 1321 | Restaurant Growth | Medium | |
| 65 | Valid Number | Hard | |
| 844 | Backspace String Compare | Easy | |
| 2226 | Maximum Candies Allocated to K Children | Medium | |
| 1217 | Minimum Cost to Move Chips to The Same Position | Easy | |
| 2401 | Longest Nice Subarray | Medium | |
| 1141 | User Activity for the Past 30 Days I | Easy | |
| 871 | Minimum Number of Refueling Stops | Hard | |
| 520 | Detect Capital | Easy | |
| 1506 | Find Root of N-Ary Tree | Medium | |
| 2843 | Count Symmetric Integers | Easy | |
| 863 | All Nodes Distance K in Binary Tree | Medium | |
| 781 | Rabbits in Forest | Medium | |
| 2145 | Count the Hidden Sequences | Medium | |
| 3304 | Find the K-th Character in String Game I | Easy | |
| 2094 | Finding 3-Digit Even Numbers | Easy | |
| 516 | Longest Palindromic Subsequence | Medium | |
| 3024 | Type of Triangle | Easy | |
| 3355 | Zero Array Transformation I | Medium | |
| 1344 | Angle Between Hands of a Clock | Medium | |
| 2200 | Find All K-Distant Indices in an Array | Easy | |
| 2040 | Kth Smallest Product of Two Sorted Arrays | Hard | |
| 792 | Number of Matching Subsequences | Medium | |
| 2311 | Longest Binary Subsequence Less Than or Equal to K | Medium | |
| 2099 | Find Subsequence of Length K With the Largest Sum | Easy | |
| 973 | K Closest Points to Origin | Medium | |
| 178 | Rank Scores | Medium | |
| 585 | Investments in 2016 | Medium | |
| 1353 | Maximum Number of Events That Can Be Attended | Medium | |
| 3136 | Valid Word | Easy | |
| 1446 | Consecutive Characters | Easy | |
| 421 | Maximum XOR of Two Numbers in an Array | Medium | |
| 1275 | Find Winner on a Tic Tac Toe Game | Easy | |
| 898 | Bitwise ORs of Subarrays | Medium | |
| 2787 | Ways to Express an Integer as Sum of Powers | Medium | |
| 657 | Robot Return to Origin | Easy | |
| 262 | Trips and Users | Hard | |
| 1504 | Count Submatrices With All Ones | Medium | |
| 309 | Best Time to Buy and Sell Stock with Cooldown | Medium | |
| 3195 | Find the Minimum Area to Cover All Ones I | Medium | |
| 2327 | Number of People Aware of a Secret | Medium | |
| 507 | Perfect Number | Easy | |
| 572 | Subtree of Another Tree | Easy | |
| 812 | Largest Triangle Area | Easy | |
| 1266 | Minimum Time Visiting All Points | Easy | |
| 2048 | Next Greater Numerically Balanced Number | Medium | |
| 3719 | Longest Balanced Subarray I | Medium | |
| 815 | Bus Routes | Hard | |
| 3217 | Delete Nodes From Linked List Present in Array | Medium | |
| 1046 | Last Stone Weight | Easy | |
| 1502 | Can Make Arithmetic Progression From Sequence | Easy | |
| 682 | Baseball Game | Easy | |
| 3010 | Divide an Array Into Subarrays With Minimum Cost I | Easy | |
| 696 | Count Binary Substrings | Easy | |
| 673 | Number of Longest Increasing Subsequence | Medium | |
| 1022 | Sum of Root To Leaf Binary Numbers | Easy | |
| 2833 | Furthest Point From Origin | Easy | |
| 59 | Spiral Matrix II | Medium | |
| 89 | Gray Code | Medium | |
| 95 | Unique Binary Search Trees II | Medium | |
| 96 | Unique Binary Search Trees | Medium | |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | Medium | |
| 109 | Convert Sorted List to Binary Search Tree | Medium | |
| 119 | Pascal's Triangle II | Easy | |
| 132 | Palindrome Partitioning II | Hard | |
| 164 | Maximum Gap | Medium | |
| 191 | Number of 1 Bits | Easy | |
| 212 | Word Search II | Hard | |
| 257 | Binary Tree Paths | Easy | |
| 273 | Integer to English Words | Hard | |
| 304 | Range Sum Query 2D - Immutable | Medium | |
| 307 | Range Sum Query - Mutable | Medium | |
| 312 | Burst Balloons | Hard | |
| 319 | Bulb Switcher | Medium | |
| 343 | Integer Break | Medium | |
| 354 | Russian Doll Envelopes | Hard | |
| 355 | Design Twitter | Medium | |
| 378 | Kth Smallest Element in a Sorted Matrix | Medium | |
| 404 | Sum of Left Leaves | Easy | |
| 432 | All O`one Data Structure | Hard | |
| 433 | Minimum Genetic Mutation | Medium | |
| 436 | Find Right Interval | Medium | |
| 437 | Path Sum III | Medium | |
| 460 | LFU Cache | Hard | |
| 486 | Predict the Winner | Medium | |
| 501 | Find Mode in Binary Search Tree | Easy | |
| 513 | Find Bottom Left Tree Value | Medium | |
| 554 | Brick Wall | Medium | |
| 576 | Out of Boundary Paths | Medium | |
| 607 | Sales Person | Easy | |
| 650 | 2 Keys Keyboard | Medium | |
| 652 | Find Duplicate Subtrees | Medium | |
| 718 | Maximum Length of Repeated Subarray | Medium | |
| 740 | Delete and Earn | Medium | |
| 744 | Find Smallest Letter Greater Than Target | Easy | |
| 763 | Partition Labels | Medium | |
| 700 | Search in a Binary Search Tree | Easy | |
| 703 | Kth Largest Element in a Stream | Easy | |
| 779 | K-th Symbol in Grammar | Medium | |
| 785 | Is Graph Bipartite? | Medium | |
| 791 | Custom Sort String | Medium | |
| 705 | Design HashSet | Easy | |
| 622 | Design Circular Queue | Medium | |
| 846 | Hand of Straights | Medium | |
| 856 | Score of Parentheses | Medium | |
| 877 | Stone Game | Medium | |
| 885 | Spiral Matrix III | Medium | |
| 888 | Fair Candy Swap | Easy | |
| 931 | Minimum Falling Path Sum | Medium | |
| 935 | Knight Dialer | Medium | |
| 950 | Reveal Cards In Increasing Order | Medium | |
| 979 | Distribute Coins in Binary Tree | Medium | |
| 980 | Unique Paths III | Hard | |
| 986 | Interval List Intersections | Medium | |
| 997 | Find the Town Judge | Easy | |
| 1008 | Construct Binary Search Tree from Preorder Traversal | Medium | |
| 1027 | Longest Arithmetic Subsequence | Medium | |
| 1042 | Flower Planting With No Adjacent | Medium | |
| 1044 | Longest Duplicate Substring | Hard | |
| 1048 | Longest String Chain | Medium | |
| 1075 | Project Employees I | Easy | |
| 1089 | Duplicate Zeros | Easy | |
| 511 | Game Play Analysis I | Easy | |
| 1122 | Relative Sort Array | Easy | |
| 1289 | Minimum Falling Path Sum II | Hard | |
| 1130 | Minimum Cost Tree From Leaf Values | Medium | |
| 1137 | N-th Tribonacci Number | Easy | |
| 1140 | Stone Game II | Medium | |
| 1382 | Balance a Binary Search Tree | Medium | |
| 1550 | Three Consecutive Odds | Easy | |
| 2273 | Find Resultant Array After Removing Anagrams | Easy | |
| 1282 | Group the People Given the Group Size They Belong To | Medium | |
| 1438 | Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | Medium | |
| 1518 | Water Bottles | Easy | |
| 1517 | Find Users With Valid E-Mails | Easy | |
| 1527 | Patients With a Condition | Easy | |
| 1578 | Minimum Time to Make Rope Colorful | Medium | |
| 1608 | Special Array With X Elements Greater Than or Equal X | Easy | |
| 1653 | Minimum Deletions to Make String Balanced | Medium | |
| 1633 | Percentage of Users Attended a Contest | Easy | |
| 1672 | Richest Customer Wealth | Easy | |
| 1717 | Maximum Score From Removing Substrings | Medium | |
| 1863 | Sum of All Subset XOR Totals | Easy | |
| 1911 | Maximum Alternating Subsequence Sum | Medium | |
| 2009 | Minimum Number of Operations to Make Array Continuous | Hard | |
| 2073 | Time Needed to Buy Tickets | Easy | |
| 2095 | Delete the Middle Node of a Linked List | Medium | |
| 2130 | Maximum Twin Sum of a Linked List | Medium | |
| 2385 | Amount of Time for Binary Tree to Be Infected | Medium | |
| 2583 | Kth Largest Sum in a Binary Tree | Medium | |
| 2574 | Left and Right Sum Differences | Easy | |
| 2704 | To Be Or Not To Be | Easy | |
| 2703 | Return Length of Arguments Passed | Easy | |
| 2956 | Find Common Elements Between Two Arrays | Easy | |
| 357 | Count Numbers with Unique Digits | Medium | |
| 508 | Most Frequent Subtree Sum | Medium | |
| 2011 | Final Value of Variable After Performing Operations | Easy | |
| 1105 | Filling Bookcase Shelves | Medium | |
| 1025 | Divisor Game | Easy | |
| 2134 | Minimum Swaps to Group All 1's Together II | Medium | |
| 1667 | Fix Names in a Table | Easy | |
| 1389 | Create Target Array in the Given Order | Easy | |
| 3186 | Maximum Total Damage With Spell Casting | Medium | |
| 1508 | Range Sum of Sorted Subarray Sums | Medium | |
| 686 | Repeated String Match | Medium | |
| 896 | Monotonic Array | Easy | |
| 725 | Split Linked List in Parts | Medium | |
| 843 | Guess the Word | Hard | |
| 1568 | Minimum Number of Days to Disconnect Island | Hard | |
| 2064 | Minimized Maximum of Products Distributed to Any Store | Medium | |
| 1937 | Maximum Number of Points with Cost | Medium | |
| 664 | Strange Printer | Hard | |
| 221 | Maximal Square | Medium | |
| 3264 | Final Array State After K Multiplication Operations I | Easy | |
| 252 | Meeting Rooms | Easy | |
| 407 | Trapping Rain Water II | Hard | |
| 1945 | Sum of Digits of String After Convert | Easy | |
| 2028 | Find Missing Observations | Medium | |
| 1367 | Linked List in Binary Tree | Medium | |
| 590 | N-ary Tree Postorder Traversal | Easy | |
| 2220 | Minimum Bit Flips to Convert Number | Easy | |
| 3254 | Find the Power of K-Size Subarrays I | Medium | |
| 2419 | Longest Subarray With Maximum Bitwise AND | Medium | |
| 1371 | Find the Longest Substring Containing Vowels in Even Counts | Medium | |
| 729 | My Calendar I | Medium | |
| 1268 | Search Suggestions System | Medium | |
| 1590 | Make Sum Divisible by P | Medium | |
| 1267 | Count Servers that Communicate | Medium | |
| 1813 | Sentence Similarity III | Medium | |
| 1942 | The Number of the Smallest Unoccupied Chair | Medium | |
| 2406 | Divide Intervals Into Minimum Number of Groups | Medium | |
| 2724 | Sort By | Easy | |
| 373 | Find K Pairs with Smallest Sums | Medium | |
| 1976 | Number of Ways to Arrive at Destination | Medium | |
| 2590 | Design a Todo List | Medium | |
| 1405 | Longest Happy String | Medium | |
| 321 | Create Maximum Number | Hard | |
| 1545 | Find Kth Bit in Nth Binary String | Medium | |
| 1106 | Parsing A Boolean Expression | Hard | |
| 1464 | Maximum Product of Two Elements in an Array | Easy | |
| 1593 | Split a String Into the Max Number of Unique Substrings | Medium | |
| 346 | Moving Average from Data Stream | Easy | |
| 1475 | Final Prices With a Special Discount in a Shop | Easy | |
| 3190 | Find Minimum Operations to Make All Elements Divisible by Three | Easy | |
| 1671 | Minimum Number of Removals to Make Mountain Array | Hard | |
| 2463 | Minimum Total Distance Traveled | Hard | |
| 216 | Combination Sum III | Medium | |
| 2490 | Circular Sentence | Easy | |
| 599 | Minimum Index Sum of Two Lists | Easy | |
| 942 | DI String Match | Easy | |
| 2914 | Minimum Number of Changes to Make Binary String Beautiful | Medium | |
| 1534 | Count Good Triplets | Easy | |
| 1829 | Maximum XOR for Each Query | Medium | |
| 3133 | Minimum Array End | Medium | |
| 3286 | Find a Safe Walk Through a Grid | Medium | |
| 415 | Add Strings | Easy | |
| 697 | Degree of an Array | Easy | |
| 1373 | Maximum Sum BST in Binary Tree | Hard | |
| 1957 | Delete Characters to Make Fancy String | Easy | |
| 1072 | Flip Columns For Maximum Number of Equal Rows | Medium | |
| 292 | Nim Game | Easy | |
| 752 | Open the Lock | Medium | |
| 171 | Excel Sheet Column Number | Easy | |
| 2413 | Smallest Even Multiple | Easy | |
| 3152 | Special Array II | Medium | |
| 1944 | Number of Visible People in a Queue | Hard | |
| 2062 | Count Vowel Substrings of a String | Easy | |
| 2784 | Check if Array is Good | Easy | |
| 2593 | Find Score of an Array After Marking All Elements | Medium | |
| 480 | Sliding Window Median | Hard | |
| 2762 | Continuous Subarrays | Medium | |
| 1792 | Maximum Average Pass Ratio | Medium | |
| 289 | Game of Life | Medium | |
| 3354 | Make Array Elements Equal to Zero | Easy | |
| 769 | Max Chunks To Make Sorted | Medium | |
| 3388 | Count Beautiful Splits in an Array | Medium | |
| 1068 | Product Sales Analysis I | Easy | |
| 1791 | Find Center of Star Graph | Easy | |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | Hard | |
| 528 | Random Pick with Weight | Medium | |
| 2270 | Number of Ways to Split Array | Medium | |
| 1769 | Minimum Number of Operations to Move All Balls to Each Box | Medium | |
| 1408 | String Matching in an Array | Easy | |
| 3042 | Count Prefix and Suffix Pairs I | Easy | |
| 2185 | Counting Words With a Given Prefix | Easy | |
| 916 | Word Subsets | Medium | |
| 627 | Swap Sex of Employees | Easy | |
| 1400 | Construct K Palindrome Strings | Medium | |
| 624 | Maximum Distance in Arrays | Medium | |
| 2116 | Check if a Parentheses String Can Be Valid | Medium | |
| 3223 | Minimum Length of String After Operations | Medium | |
| 2429 | Minimize XOR | Medium | |
| 1255 | Maximum Score Words Formed by Letters | Hard | |
| 617 | Merge Two Binary Trees | Easy | |
| 2661 | First Completely Painted Row or Column | Medium | |
| 3428 | Maximum and Minimum Sums of at Most Size K Subsequences | Medium | |
| 1293 | Shortest Path in a Grid with Obstacles Elimination | Hard | |
| 2017 | Grid Game | Medium | |
| 3429 | Paint House IV | Medium | |
| 2373 | Largest Local Values in a Matrix | Easy | |
| 1290 | Convert Binary Number in a Linked List to Integer | Easy | |
| 2007 | Find Original Array From Doubled Array | Medium | |
| 93 | Restore IP Addresses | Medium | |
| 2215 | Find the Difference of Two Arrays | Easy | |
| 1778 | Shortest Path in a Hidden Grid | Medium | |
| 317 | Shortest Distance from All Buildings | Hard | |
| 581 | Shortest Unsorted Continuous Subarray | Medium | |
| 1171 | Remove Zero Sum Consecutive Nodes from Linked List | Medium | |
| 3160 | Find the Number of Distinct Colors Among the Balls | Medium | |
| 2418 | Sort the People | Easy | |
| 427 | Construct Quad Tree | Medium | |
| 1763 | Longest Nice Substring | Easy | |
| 1352 | Product of the Last K Numbers | Medium | |
| 2824 | Count Pairs Whose Sum is Less than Target | Easy | |
| 310 | Minimum Height Trees | Medium | |
| 1907 | Count Salary Categories | Medium | |
| 1980 | Find Unique Binary String | Medium | |
| 575 | Distribute Candies | Easy | |
| 1028 | Recover a Tree From Preorder Traversal | Hard | |
| 889 | Construct Binary Tree from Preorder and Postorder Traversal | Medium | |
| 754 | Reach a Number | Medium | |
| 873 | Length of Longest Fibonacci Subsequence | Medium | |
| 1309 | Decrypt String from Alphabet to Integer Mapping | Easy | |
| 1749 | Maximum Absolute Sum of Any Subarray | Medium | |
| 1780 | Check if Number is a Sum of Powers of Three | Medium | |
| 2579 | Count Total Number of Colored Cells | Medium | |
| 2542 | Maximum Subsequence Score | Medium | |
| 2523 | Closest Prime Numbers in Range | Medium | |
| 286 | Walls and Gates | Medium | |
| 1456 | Maximum Number of Vowels in a Substring of Given Length | Medium | |
| 3208 | Alternating Groups II | Medium | |
| 3306 | Count of Substrings Containing Every Vowel and K Consonants II | Medium | |
| 667 | Beautiful Arrangement II | Medium | |
| 3356 | Zero Array Transformation II | Medium | |
| 417 | Pacific Atlantic Water Flow | Medium | |
| 1049 | Last Stone Weight II | Medium | |
| 2206 | Divide Array Into Equal Pairs | Easy | |
| 1854 | Maximum Population Year | Easy | |
| 2058 | Find the Minimum and Maximum Number of Nodes Between Critical Points | Medium | |
| 3191 | Minimum Operations to Make Binary Array Elements Equal to One I | Medium | |
| 2115 | Find All Possible Recipes from Given Supplies | Medium | |
| 1710 | Maximum Units on a Truck | Easy | |
| 848 | Shifting Letters | Medium | |
| 3453 | Separate Squares I | Medium | |
| 3394 | Check if Grid can be Cut into Sections | Medium | |
| 1084 | Sales Analysis III | Easy | |
| 1052 | Grumpy Bookstore Owner | Medium | |
| 747 | Largest Number At Least Twice of Others | Easy | |
| 2140 | Solving Questions With Brainpower | Medium | |
| 2874 | Maximum Value of an Ordered Triplet II | Medium | |
| 1123 | Lowest Common Ancestor of Deepest Leaves | Medium | |
| 3396 | Minimum Number of Operations to Make Elements in Array Distinct | Easy | |
| 3375 | Minimum Operations to Make Array Values Equal to K | Easy | |
| 687 | Longest Univalue Path | Medium | |
| 2179 | Count Good Triplets in an Array | Hard | |
| 2176 | Count Equal and Divisible Pairs in an Array | Easy | |
| 2109 | Adding Spaces to a String | Medium | |
| 918 | Maximum Sum Circular Subarray | Medium | |
| 2352 | Equal Row and Column Pairs | Medium | |
| 2800 | Shortest String That Contains Three Strings | Medium | |
| 1399 | Count Largest Group | Easy | |
| 832 | Flipping an Image | Easy | |
| 2845 | Count of Interesting Subarrays | Medium | |
| 2974 | Minimum Number Game | Easy | |
| 2404 | Most Frequent Even Element | Easy | |
| 2259 | Remove Digit From Number to Maximize Result | Easy | |
| 2962 | Count Subarrays Where Max Element Appears at Least K Times | Medium | |
| 838 | Push Dominoes | Medium | |
| 3310 | Remove Methods From Project | Medium | |
| 2570 | Merge Two 2D Arrays by Summing Values | Easy | |
| 2337 | Move Pieces to Obtain a String | Medium | |
| 1128 | Number of Equivalent Domino Pairs | Easy | |
| 790 | Domino and Tromino Tiling | Medium | |
| 3341 | Find Minimum Time to Reach Last Room I | Medium | |
| 2071 | Maximum Number of Tasks You Can Assign | Hard | |
| 174 | Dungeon Game | Hard | |
| 1642 | Furthest Building You Can Reach | Medium | |
| 1931 | Painting a Grid With Three Different Colors | Hard | |
| 1979 | Find Greatest Common Divisor of Array | Easy | |
| 2894 | Divisible and Non-divisible Sums Difference | Easy | |
| 3362 | Zero Array Transformation III | Medium | |
| 2131 | Longest Palindrome by Concatenating Two Letter Words | Medium | |
| 701 | Insert into a Binary Search Tree | Medium | |
| 3557 | Find Maximum Number of Non Intersecting Substrings | Medium | |
| 3547 | Maximum Sum of Edge Values in a Graph | Hard | |
| 1684 | Count the Number of Consistent Strings | Easy | |
| 3568 | Minimum Moves to Clean the Classroom | Medium | |
| 1006 | Clumsy Factorial | Medium | |
| 619 | Biggest Single Number | Easy | |
| 1298 | Maximum Candies You Can Get from Boxes | Hard | |
| 3403 | Find the Lexicographically Largest String From the Box I | Medium | |
| 1524 | Number of Sub-arrays With Odd Sum | Medium | |
| 2170 | Minimum Operations to Make the Array Alternating | Medium | |
| 1544 | Make The String Great | Easy | |
| 3170 | Lexicographically Minimum String After Removing Stars | Medium | |
| 862 | Shortest Subarray with Sum at Least K | Hard | |
| 2000 | Reverse Prefix of Word | Easy | |
| 3445 | Maximum Difference Between Even and Odd Frequency II | Hard | |
| 3423 | Maximum Difference Between Adjacent Elements in a Circular Array | Easy | |
| 2359 | Find Closest Node to Given Two Nodes | Medium | |
| 2016 | Maximum Difference Between Increasing Elements | Easy | |
| 1432 | Max Difference You Can Get From Changing an Integer | Medium | |
| 2460 | Apply Operations to an Array | Easy | |
| 2966 | Divide Array Into Arrays With Max Difference | Medium | |
| 3582 | Generate Tag for Video Caption | Easy | |
| 2643 | Row With Maximum Ones | Easy | |
| 1392 | Longest Happy Prefix | Hard | |
| 1631 | Path With Minimum Effort | Medium | |
| 3443 | Maximum Manhattan Distance After K Changes | Medium | |
| 2138 | Divide a String Into Groups of Size k | Easy | |
| 3085 | Minimum Deletions to Make String K-Special | Medium | |
| 2081 | Sum of k-Mirror Numbers | Hard | |
| 2807 | Insert Greatest Common Divisors in Linked List | Medium | |
| 87 | Scramble String | Hard | |
| 2231 | Largest Number After Digit Swaps by Parity | Easy | |
| 1926 | Nearest Exit from Entrance in Maze | Medium | |
| 2191 | Sort the Jumbled Numbers | Medium | |
| 3330 | Find the Original Typed String I | Easy | |
| 1051 | Height Checker | Easy | |
| 1991 | Find the Middle Index in Array | Easy | |
| 3333 | Find the Original Typed String II | Hard | |
| 3307 | Find the K-th Character in String Game II | Hard | |
| 1729 | Find Followers Count | Easy | |
| 3151 | Special Array I | Easy | |
| 1394 | Find Lucky Integer in an Array | Easy | |
| 3147 | Taking Maximum Energy From the Mystic Dungeon | Medium | |
| 1865 | Finding Pairs With a Certain Sum | Medium | |
| 551 | Student Attendance Record I | Easy | |
| 1751 | Maximum Number of Events That Can Be Attended II | Hard | |
| 3439 | Reschedule Meetings for Maximum Free Time I | Medium | |
| 3440 | Reschedule Meetings for Maximum Free Time II | Medium | |
| 1013 | Partition Array Into Three Parts With Equal Sum | Easy | |
| 2726 | Calculator with Method Chaining | Easy | |
| 1900 | The Earliest and Latest Rounds Where Players Compete | Hard | |
| 968 | Binary Tree Cameras | Hard | |
| 3202 | Find the Maximum Length of Valid Subsequence II | Medium | |
| 899 | Orderly Queue | Hard | |
| 674 | Longest Continuous Increasing Subsequence | Easy | |
| 2163 | Minimum Difference in Sums After Removal of Elements | Hard | |
| 2303 | Calculate Amount Paid in Taxes | Easy | |
| 2300 | Successful Pairs of Spells and Potions | Medium | |
| 2623 | Memoize | Medium | |
| 1695 | Maximum Erasure Value | Medium | |
| 2483 | Minimum Penalty for a Shop | Medium | |
| 3274 | Check if Two Chessboard Squares Have the Same Color | Easy | |
| 2723 | Add Two Promises | Easy | |
| 3487 | Maximum Unique Subarray Sum After Deletion | Easy | |
| 1158 | Market Analysis I | Medium | |
| 3480 | Maximize Subarrays After Removing One Conflicting Pair | Hard | |
| 2210 | Count Hills and Valleys in an Array | Easy | |
| 2044 | Count Number of Maximum Bitwise-OR Subsets | Medium | |
| 2481 | Minimum Cuts to Divide a Circle | Easy | |
| 2411 | Smallest Subarrays With Maximum Bitwise OR | Medium | |
| 1748 | Sum of Unique Elements | Easy | |
| 953 | Verifying an Alien Dictionary | Easy | |
| 1202 | Smallest String With Swaps | Medium | |
| 2561 | Rearranging Fruits | Hard | |
| 991 | Broken Calculator | Medium | |
| 2597 | The Number of Beautiful Subsets | Medium | |
| 3479 | Fruits Into Baskets III | Medium | |
| 3363 | Find the Maximum Number of Fruits Collected | Hard | |
| 2535 | Difference Between Element Sum and Digit Sum of an Array | Easy | |
| 490 | The Maze | Medium | |
| 2438 | Range Product Queries of Powers | Medium | |
| 1698 | Number of Distinct Substrings in a String | Medium | |
| 2264 | Largest 3-Same-Digit Number in String | Easy | |
| 536 | Construct Binary Tree from String | Medium | |
| 821 | Shortest Distance to a Character | Easy | |
| 342 | Power of Four | Easy | |
| 837 | New 21 Game | Medium | |
| 363 | Max Sum of Rectangle No Larger Than K | Hard | |
| 1323 | Maximum 69 Number | Easy | |
| 679 | 24 Game | Hard | |
| 1493 | Longest Subarray of 1's After Deleting One Element | Medium | |
| 2582 | Pass the Pillow | Easy | |
| 1851 | Minimum Interval to Include Each Query | Hard | |
| 201 | Bitwise AND of Numbers Range | Medium | |
| 1300 | Sum of Mutated Array Closest to Target | Medium | |
| 1203 | Sort Items by Groups Respecting Dependencies | Hard | |
| 1319 | Number of Operations to Make Network Connected | Medium | |
| 1342 | Number of Steps to Reduce a Number to Zero | Easy | |
| 784 | Letter Case Permutation | Medium | |
| 3021 | Alice and Bob Playing Flower Game | Medium | |
| 2942 | Find Words Containing Character | Easy | |
| 461 | Hamming Distance | Easy | |
| 3211 | Generate Binary Strings Without Adjacent Zeros | Medium | |
| 3516 | Find Closest Person | Easy | |
| 2749 | Minimum Operations to Make the Integer Zero | Medium | |
| 3495 | Minimum Operations to Make Array Elements Zero | Hard | |
| 3478 | Choose K Elements With Maximum Sum | Medium | |
| 2119 | A Number After a Double Reversal | Easy | |
| 1733 | Minimum Number of People to Teach | Medium | |
| 526 | Beautiful Arrangement | Medium | |
| 966 | Vowel Spellchecker | Medium | |
| 2503 | Maximum Number of Points From Grid Queries | Hard | |
| 1668 | Maximum Repeating Substring | Easy | |
| 2074 | Reverse Nodes in Even Length Groups | Medium | |
| 3408 | Design Task Manager | Medium | |
| 3222 | Find the Winning Player in Coin Game | Easy | |
| 3005 | Count Elements With Maximum Frequency | Easy | |
| 1061 | Lexicographically Smallest Equivalent String | Medium | |
| 2395 | Find Subarrays With Equal Sum | Easy | |
| 166 | Fraction to Recurring Decimal | Medium | |
| 976 | Largest Perimeter Triangle | Easy | |
| 2540 | Minimum Common Value | Easy | |
| 220 | Contains Duplicate III | Hard | |
| 3035 | Maximum Palindromes After Operations | Medium | |
| 887 | Super Egg Drop | Hard | |
| 401 | Binary Watch | Easy | |
| 1460 | Make Two Arrays Equal by Reversing Subarrays | Easy | |
| 2517 | Maximum Tastiness of Candy Basket | Medium | |
| 1488 | Avoid Flood in The City | Medium | |
| 3494 | Find the Minimum Amount of Time to Brew Potions | Medium | |
| 2364 | Count Number of Bad Pairs | Medium | |
| 3703 | Remove K-Balanced Substrings | Medium | |
| 1385 | Find the Distance Value Between Two Arrays | Easy | |
| 649 | Dota2 Senate | Medium | |
| 3349 | Adjacent Increasing Subarrays Detection I | Easy | |
| 3397 | Maximum Number of Distinct Elements After Operations | Medium | |
| 2090 | K Radius Subarray Averages | Medium | |
| 1366 | Rank Teams by Votes | Medium | |
| 3713 | Longest Balanced Substring I | Medium | |
| 1041 | Robot Bounded In Circle | Medium | |
| 600 | Non-negative Integers without Consecutive Ones | Hard | |
| 2043 | Simple Bank System | Medium | |
| 3609 | Minimum Moves to Reach Target in Grid | Hard | |
| 938 | Range Sum of BST | Easy | |
| 2441 | Largest Positive Integer That Exists With Its Negative | Easy | |
| 895 | Maximum Frequency Stack | Hard | |
| 2648 | Generate Fibonacci Sequence | Easy | |
| 3318 | Find X-Sum of All K-Long Subarrays I | Easy | |
| 3321 | Find X-Sum of All K-Long Subarrays II | Hard | |
| 1639 | Number of Ways to Form a Target String Given a Dictionary | Hard | |
| 1611 | Minimum One Bit Operations to Make Integers Zero | Hard | |
| 1240 | Tiling a Rectangle with the Fewest Squares | Hard | |
| 348 | Design Tic-Tac-Toe | Medium | |
| 3542 | Minimum Operations to Convert All Elements to Zero | Medium | |
| 474 | Ones and Zeroes | Medium | |
| 395 | Longest Substring with At Least K Repeating Characters | Medium | |
| 3228 | Maximum Number of Operations to Move Ones to the End | Medium | |
| 1948 | Delete Duplicate Folders in System | Hard | |
| 768 | Max Chunks To Make Sorted II | Hard | |
| 3234 | Count the Number of Substrings With Dominant Ones | Medium | |
| 1437 | Check If All 1's Are at Least Length K Places Away | Easy | |
| 1657 | Determine if Two Strings Are Close | Medium | |
| 717 | 1-bit and 2-bit Characters | Easy | |
| 623 | Add One Row to Tree | Medium | |
| 2154 | Keep Multiplying Found Values by Two | Easy | |
| 880 | Decoded String at Index | Medium | |
| 3006 | Find Beautiful Indices in the Given Array I | Medium | |
| 1015 | Smallest Integer Divisible by K | Medium | |
| 694 | Number of Distinct Islands | Medium | |
| 2141 | Maximum Running Time of N Computers | Hard | |
| 759 | Employee Free Time | Hard | |
| 3432 | Count Partitions with Even Sum Difference | Easy | |
| 270 | Closest Binary Search Tree Value | Easy | |
| 608 | Tree Node | Medium | |
| 552 | Student Attendance Record II | Hard | |
| 218 | The Skyline Problem | Hard | |
| 3583 | Count Special Triplets | Medium | |
| 1386 | Cinema Seat Allocation | Medium | |
| 2551 | Put Marbles in Bags | Hard | |
| 3623 | Count Number of Trapezoids I | Medium | |
| 2492 | Minimum Score of a Path Between Two Cities | Medium | |
| 3433 | Count Mentions Per User | Medium | |
| 419 | Battleships in a Board | Medium | |
| 2890 | Reshape Data: Melt | Easy | |
| 2147 | Number of Ways to Divide a Long Corridor | Hard | |
| 3484 | Design Spreadsheet | Medium | |
| 3347 | Maximum Frequency of an Element After Performing Operations II | Hard | |
| 1925 | Count Square Sum Triples | Easy | |
| 3776 | Minimum Moves to Balance Circular Array | Medium | |
| 955 | Delete Columns to Make Sorted II | Medium | |
| 2124 | Check if All A's Appears Before All B's | Easy | |
| 1765 | Map of Highest Peak | Medium | |
| 457 | Circular Array Loop | Medium | |
| 2421 | Number of Good Paths | Hard | |
| 3074 | Apple Redistribution into Boxes | Easy | |
| 3497 | Analyze Subscription Conversion | Medium | |
| 2402 | Meeting Rooms III | Hard | |
| 3469 | Find Minimum Cost to Remove Array Elements | Medium | |
| 2027 | Minimum Moves to Convert String | Easy | |
| 840 | Magic Squares In Grid | Medium | |
| 385 | Mini Parser | Medium | |
| 808 | Soup Servings | Medium | |
| 1411 | Number of Ways to Paint N × 3 Grid | Hard | |
| 1390 | Four Divisors | Medium | |
| 967 | Numbers With Same Consecutive Differences | Medium | |
| 377 | Combination Sum IV | Medium | |
| 1975 | Maximum Matrix Sum | Medium | |
| 911 | Online Election | Medium | |
| 324 | Wiggle Sort II | Medium | |
| 1339 | Maximum Product of Splitted Binary Tree | Medium | |
| 1458 | Max Dot Product of Two Subsequences | Hard | |
| 865 | Smallest Subtree with all the Deepest Nodes | Medium | |
| 925 | Long Pressed Name | Easy | |
| 3043 | Find the Length of the Longest Common Prefix | Medium | |
| 707 | Design Linked List | Medium | |
| 446 | Arithmetic Slices II - Subsequence | Hard | |
| 2975 | Maximum Square Area by Removing Fences From a Field | Medium | |
| 3731 | Find Missing Elements | Easy | |
| 3047 | Find the Largest Area of Square Inside Two Rectangles | Medium | |
| 961 | N-Repeated Element in Size 2N Array | Easy | |
| 477 | Total Hamming Distance | Medium | |
| 2516 | Take K of Each Character From Left and Right | Medium | |
| 3649 | Number of Perfect Pairs | Medium | |
| 636 | Exclusive Time of Functions | Medium | |
| 3314 | Construct the Minimum Bitwise Array I | Easy | |
| 3507 | Minimum Pair Removal to Sort Array I | Easy | |
| 2236 | Root Equals Sum of Children | Easy | |
| 532 | K-diff Pairs in an Array | Medium | |
| 1281 | Subtract the Product and Sum of Digits of an Integer | Easy | |
| 3650 | Minimum Cost Path with Edge Reversals | Medium | |
| 2716 | Minimize String Length | Easy | |
| 223 | Rectangle Area | Medium | |
| 1026 | Maximum Difference Between Node and Ancestor | Medium | |
| 337 | House Robber III | Medium | |
| 1160 | Find Words That Can Be Formed by Characters | Easy | |
| 833 | Find And Replace in String | Medium | |
| 868 | Binary Gap | Easy | |
| 3640 | Trionic Array II | Hard | |
| 2022 | Convert 1D Array Into 2D Array | Easy | |
| 3658 | GCD of Odd and Even Sums | Easy | |
| 335 | Self Crossing | Hard | |
| 2197 | Replace Non-Coprime Numbers in Array | Hard | |
| 817 | Linked List Components | Medium | |
| 1226 | The Dining Philosophers | Medium | |
| 3714 | Longest Balanced Substring II | Medium | |
| 922 | Sort Array By Parity II | Easy | |
| 799 | Champagne Tower | Medium | |
| 487 | Max Consecutive Ones II | Medium | |
| 761 | Special Binary String | Hard | |
| 698 | Partition to K Equal Sum Subsets | Medium | |
| 1718 | Construct the Lexicographically Largest Valid Sequence | Medium | |
| 1197 | Minimum Knight Moves | Medium | |
| 1680 | Concatenation of Consecutive Binary Numbers | Medium | |
| 195 | Tenth Line | Easy | |
| 1536 | Minimum Swaps to Arrange a Binary Grid | Medium | |
| 301 | Remove Invalid Parentheses | Hard | |
| 2880 | Select Data | Easy | |
| 3848 | Check Digitorial Permutation | Medium | |
| 1758 | Minimum Changes To Make Alternating Binary String | Easy | |
| 777 | Swap Adjacent in LR String | Medium | |
| 3025 | Find the Number of Ways to Place People I | Medium | |
| 107 | Binary Tree Level Order Traversal II | Medium | |
| 1337 | The K Weakest Rows in a Matrix | Easy | |
| 1622 | Fancy Sequence | Hard | |
| 3346 | Maximum Frequency of an Element After Performing Operations I | Medium | |
| 1727 | Largest Submatrix With Rearrangements | Medium | |
| 3434 | Maximum Frequency After Subarray Operation | Medium | |
| 1693 | Daily Leads and Partners | Easy | |
| 564 | Find the Closest Palindrome | Hard | |
| 2906 | Construct Product Matrix | Medium | |
| 3546 | Equal Sum Grid Partition I | Medium | |
| 269 | Alien Dictionary | Hard | |
| 2257 | Count Unguarded Cells in the Grid | Medium | |
| 601 | Human Traffic of Stadium | Hard | |
| 3418 | Maximum Amount of Money Robot Can Earn | Medium | |
| 2530 | Maximal Score After Applying K Operations | Medium | |
| 3471 | Find the Largest Almost Missing Integer | Easy | |
| 1800 | Maximum Ascending Subarray Sum | Easy | |
| 2336 | Smallest Number in Infinite Set | Medium | |
| 1669 | Merge In Between Linked Lists | Medium | |
| 1092 | Shortest Common Supersequence | Hard | |
| 1848 | Minimum Distance to the Target Element | Easy | |
| 3488 | Closest Equal Element Queries | Medium | |
| 3783 | Mirror Distance of an Integer | Easy | |
| 596 | Classes With at Least 5 Students | Easy | |
| 932 | Beautiful Array | Medium | |
| 2078 | Two Furthest Houses With Different Colors | Easy | |
| 329 | Longest Increasing Path in a Matrix | Hard | |
| 2452 | Words Within Two Edits of Dictionary | Medium | |
| 403 | Frog Jump | Hard | |
| 2571 | Minimum Operations to Reduce an Integer to 0 | Medium | |
| 3464 | Maximize the Distance Between Points on a Square | Hard | |
| 396 | Rotate Function | Medium | |
| 147 | Insertion Sort List | Medium | |
| 1262 | Greatest Sum Divisible by Three | Medium | |
| 1876 | Substrings of Size Three with Distinct Characters | Easy | |
| 3660 | Jump Game IX | Medium | |
| 1722 | Minimize Hamming Distance After Swap Operations | Medium | |
| 693 | Binary Number with Alternating Bits | Easy | |
| 1441 | Build an Array With Stack Operations | Medium | |
| 375 | Guess Number Higher or Lower II | Medium | |
| 1721 | Swapping Nodes in a Linked List | Medium | |
| 353 | Design Snake Game | Medium | |
| 941 | Valid Mountain Array | Easy | |
| 2462 | Total Cost to Hire K Workers | Medium | |
| 453 | Minimum Moves to Equal Array Elements | Medium | |
| 1188 | Design Bounded Blocking Queue | Medium | |
| 1871 | Jump Game VII | Medium | |
| 1952 | Three Divisors | Easy | |
| 341 | Flatten Nested List Iterator | Medium | |
| 447 | Number of Boomerangs | Medium | |
| 1497 | Check If Array Pairs Are Divisible by k | Medium | |
| 2356 | Number of Unique Subjects Taught by Each Teacher | Easy | |
| 400 | Nth Digit | Medium | |
| 2144 | Minimum Cost of Buying Candies With Discount | Easy | |
| 299 | Bulls and Cows | Medium | |
| 3633 | Earliest Finish Time for Land and Water Rides I | Easy | |
| 598 | Range Addition II | Easy | |
| 3753 | Total Waviness of Numbers in Range II | Hard | |
| 2952 | Minimum Number of Coins to be Added | Medium | |
| 1208 | Get Equal Substrings Within Budget | Medium | |
| 2196 | Create Binary Tree From Descriptions | Medium | |
| 1654 | Minimum Jumps to Reach Home | Medium | |
| 3559 | Number of Ways to Assign Edge Weights II | Hard | |
| 557 | Reverse Words in a String III | Easy | |
| 3838 | Weighted Word Mapping | Easy | |
| 2034 | Stock Price Fluctuation | Medium | |
| 3612 | Process String with Special Operations I | Medium | |
| 1840 | Maximum Building Height | Hard | |
| 1833 | Maximum Ice Cream Bars | Medium | |
| 1189 | Maximum Number of Balloons | Easy | |
| 801 | Minimum Swaps To Make Sequences Increasing | Hard | |
| 3700 | Number of ZigZag Arrays II | Hard | |
| 3699 | Number of ZigZag Arrays I | Hard | |
| 3193 | Count the Number of Inversions | Hard | |
| 192 | Word Frequency | Medium | |
| 690 | Employee Importance | Medium | |
| 1277 | Count Square Submatrices with All Ones | Medium | |
| 194 | Transpose File | Medium | |
| 3737 | Count Subarrays With Majority Element I | Medium | |
| 3020 | Find the Maximum Number of Elements in Subset | Medium | |
| 1793 | Maximum Score of a Good Subarray | Hard | |
| 3324 | Find the Sequence of Strings Appeared on the Screen | Medium | |
| 1967 | Number of Strings That Appear as Substrings in Word | Easy | |
| 2306 | Naming a Company | Hard | |
| 1846 | Maximum Element After Decreasing and Rearranging | Medium | |
| 504 | Base 7 | Easy | |
| 2466 | Count Ways To Build Good Strings | Medium | |
| 2812 | Find the Safest Path in a Grid | Medium | |
| 473 | Matchsticks to Square | Medium | |
| 2350 | Shortest Impossible Sequence of Rolls | Hard | |
| 3016 | Minimum Number of Pushes to Type Word II | Medium | |
| 3620 | Network Recovery Pathways | Hard | |
| 1301 | Number of Paths with Max Score | Hard | |
| 1288 | Remove Covered Intervals | Medium | |
| 2456 | Most Popular Video Creator | Medium | |
| 3483 | Unique 3-Digit Even Numbers | Easy | |
| 3756 | Concatenate Non-Zero Digits and Multiply by Sum II | Medium | |
| 3532 | Path Existence Queries in a Graph I | Medium | |
| 3534 | Path Existence Queries in a Graph II | Hard |
