| ID | Problem Name | Solution |
|---|---|---|
| 1 | Two Sum |   |
| 2 | Add Two Numbers | |
| 3 | Longest Substring without Repeating Characters | |
| 4 | Median of Two Sorted Arrays | |
| 5 | Longest Palindromic Substring | |
| 6 | Zigzag Conversion | |
| 7 | Reverse Integer | |
| 8 | String to Integer (atoi) | |
| 9 | Palindrome Number | |
| 10 | Regular Expression Matching | |
| 11 | Container With Most Water | |
| 13 | Roman to Integer | |
| 15 | 3Sum | |
| 17 | Letter Combinations of a Phone Number | |
| 19 | Remove Nth Node from End of List | |
| 20 | Valid Parentheses | |
| 21 | Merge Two Sorted Lists | |
| 22 | Generate Parentheses | |
| 23 | Merge k Sorted Lists | |
| 24 | Swap Nodes in Pairs | |
| 25 | Reverse Nodes in k-Group | |
| 33 | Search in Rotated Sorted Array | |
| 36 | Valid Sudoku | |
| 39 | Combination Sum | |
| 40 | Combination Sum II | |
| 42 | Trapping Rain Water | |
| 45 | Jump Game II | |
| 46 | Permutations | |
| 49 | Group Anagrams | |
| 51 | N-Queens | |
| 53 | Maximum Subarray | |
| 54 | Spiral Matrix | |
| 55 | Jump Game | |
| 56 | Merge Intervals | |
| 57 | Insert Interval | |
| 59 | Spiral Matrix II | |
| 61 | Rotate List | |
| 62 | Unique Paths | |
| 70 | Climbing Stairs | |
| 72 | Edit Distance | |
| 74 | Search a 2D Matrix | |
| 75 | Sort Colours | |
| 76 | Minimum Window Substring | |
| 78 | Subsets | |
| 79 | Word Search | |
| 84 | Largest Rectangle in Histogram | |
| 85 | Maximal Rectangle | |
| 88 | Merge Sorted Array | |
| 90 | Subsets II | |
| 91 | Decode Ways | |
| 94 | Binary Tree Inorder Traversal | |
| 97 | Interleaving String | |
| 98 | Validate Binary Search Tree | |
| 100 | Same Tree | |
| 102 | Binary Tree Level Order Traversal | |
| 104 | Maximum Depth of Binary Tree | |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | |
| 106 | Construct Binary Tree from Postorder and Inorder Traversal | |
| 109 | Convert Sorted List to Binary Search Tree | |
| 110 | Balanced Binary Tree | |
| 112 | Path Sum | |
| 113 | Path Sum II | |
| 114 | Flatten Binary Tree to Linked List | |
| 115 | Distinct Subsequences | |
| 121 | Best Time to Buy and Sell Stock | |
| 124 | Binary Tree Maximum Path Sum | |
| 125 | Valid Palindrome | |
| 127 | Word Ladder | |
| 128 | Longest Consecutive Sequence | |
| 130 | Surrounded Regions | |
| 131 | Palindrome Partitioning | |
| 133 | Clone Graph | |
| 134 | Gas Station | |
| 138 | Copy List with Random Pointer | |
| 139 | Word Break | |
| 141 | Linked List Cycle | |
| 143 | Reorder List | |
| 144 | Binary Tree Preorder Traversal | |
| 145 | Binary Tree Postorder Traversal | |
| 146 | LRU Cache | |
| 150 | Evaluate Reverse Polish Notation | |
| 152 | Maximum Product Subarray | |
| 153 | Find Minimum in Rotated Sorted Array | |
| 155 | Min Stack | |
| 167 | Two Sum II (Input Array is Sorted) | |
| 169 | Majority Element | |
| 175 | Combine Two Tables |  |
| 179 | Largest Number | |
| 181 | Employees Earning More Than Their Managers | |
| 197 | Rising Temperature | |
| 198 | House Robber | |
| 199 | Binary Tree Right Side View | |
| 200 | Number of Islands | |
| 206 | Reverse Linked List | |
| 207 | Course Schedule | |
| 208 | Implement Trie (Prefix Tree) | |
| 210 | Course Schedule II | |
| 211 | Design Add and Search Words Data Structure | |
| 212 | Word Search II | |
| 213 | House Robber II | |
| 215 | Kth Largest Element in an Array | |
| 217 | Contains Duplicate | |
| 226 | Invert Binary Tree | |
| 230 | Kth Smallest Element in a BST | |
| 235 | Lowest Common Ancestor of a Binary Search Tree | |
| 235 | Lowest Common Ancestor of a Binary Tree | |
| 238 | Product of Array Except Self | |
| 239 | Sliding Window Maximum | |
| 241 | Different Ways to Add Parentheses | |
| 242 | Valid Anagram | |
| 252 | Meeting Rooms | |
| 253 | Meeting Rooms II | |
| 257 | Binary Tree Paths | |
| 261 | Graph Valid Tree | |
| 264 | Ugly Number II | |
| 271 | Encode and Decode Strings | |
| 273 | Integer to English Words | |
| 283 | Move Zeroes | |
| 286 | Walls and Gates | |
| 287 | Find the Duplicate Number | |
| 295 | Find Median from Data Stream | |
| 297 | Serialize and Deserialize Binary Tree | |
| 300 | Longest Increasing Subsequence | |
| 309 | Best Time to Buy and Sell Stock with Cooldown | |
| 312 | Burst Balloons | |
| 322 | Coin Change | |
| 323 | Number of Connected Components In An Undirected Graph | |
| 329 | Longest Increasing Path in a Matrix | |
| 330 | Patching Array | |
| 338 | Counting Bits | |
| 347 | Top K Frequent Elements | |
| 349 | Intersection of Two Arrays | |
| 350 | Intersection of Two Arrays II | |
| 355 | Design Twitter | |
| 386 | Lexicographical Numbers | |
| 394 | Decode String | |
| 416 | Partition Equal Subset Sum | |
| 417 | Pacific Atlantic Water Flow | |
| 424 | Longest Repeating Character Replacement | |
| 429 | N-ary Tree Level Order Traversal | |
| 432 | All O`one Data Structure | |
| 435 | Non-Overlapping Intervals | |
| 438 | Find All Anagrams in a String | |
| 476 | Number Complement | |
| 494 | Target Sum | |
| 502 | IPO | |
| 518 | Coin Change II | |
| 535 | Encode & Decode TinyURL | |
| 538 | Convert BST to Greater Tree | |
| 539 | Minimum Time Difference | |
| 543 | Diameter of Binary Tree | |
| 547 | Number of Provinces | |
| 564 | Find the Closest Palindrome | |
| 567 | Permutation in String | |
| 570 | Managers with at Least 5 Direct Reports | |
| 572 | Subtree of Another Tree | |
| 577 | Employee Bonus | |
| 584 | Find Customer Referee | |
| 589 | N-ary Tree Preorder Traversal | |
| 590 | N-ary Tree Postorder Traversal | |
| 592 | Fraction Addition and Subtraction | |
| 595 | Big Countries | |
| 621 | Task Scheduler | |
| 624 | Maximum Distance in Arrays | |
| 632 | Smallest Range Covering Elements from K Lists | |
| 633 | Sum of Square Numbers | |
| 647 | Palindromic Substrings | |
| 650 | 2 Keys Keyboard | |
| 653 | Two Sum IV - Input is a BST | |
| 664 | Strange Printer | |
| 672 | Bulb Switcher II | |
| 673 | Maximum Swap | |
| 678 | Valid Parenthesis String | |
| 684 | Redundant Connection | |
| 685 | Redundant Connection II | |
| 695 | Max Area of Island | |
| 703 | Kth Largest Element in a Stream | |
| 704 | Binary Search | |
| 713 | Subarray Product Less Than K | |
| 719 | Find K-th Smallest Pair Distance | |
| 725 | Split Linked List in Parts | |
| 726 | Number of Atoms | |
| 729 | My Calendar I | |
| 731 | My Calendar II | |
| 739 | Daily Temperature | |
| 746 | Min Cost Climbing Stairs | |
| 763 | Partition Labels | |
| 796 | Rotate String | |
| 826 | Most Profit Assigning Work | |
| 840 | Magic Squares In Grid | |
| 846 | Hand of Straights | |
| 853 | Car Fleet | |
| 860 | Lemonade Change | |
| 874 | Walking Robot Simulation | |
| 875 | Koko Eating Bananas | |
| 876 | Middle of the Linked List | |
| 884 | Uncommon Words from Two Sentences | |
| 885 | Spiral Matrix III | |
| 889 | Construct Binary Tree from Preorder and Postorder Traversal | |
| 912 | Sort an Array | |
| 921 | Minimum Add to Make Parentheses Valid | |
| 945 | Minimum Increment to Make Array Unique | |
| 947 | Most Stones Removed with Same Row or Column | |
| 951 | Flip Equivalent Binary Trees | |
| 959 | Regions Cut by Slashes | |
| 962 | Maximum Width Ramp | |
| 973 | K Closest Points to Origin | |
| 974 | Subarray Sums Divisible by K | |
| 981 | Time Based Key-Value Store | |
| 994 | Rotting Oranges | |
| 995 | Minimum Number of K Consecutive Bit Flips | |
| 1009 | Complement of Base 10 Integer | |
| 1038 | Binary Search Tree to Greater Sum Tree | |
| 1046 | Last Stone Weight | |
| 1052 | Grumpy Bookstore Owner | |
| 1068 | Product Sales Analysis I | |
| 1105 | Filling Bookcase Shelves | |
| 1106 | Parsing A Boolean Expression | |
| 1110 | Delete Nodes And Return Forest | |
| 1122 | Relative Sort Array | |
| 1133 | Largest Unique Number | |
| 1140 | Stone Game II | |
| 1143 | Longest Common Subsequence | |
| 1148 | Article Views I | |
| 1190 | Reverse Substrings Between Each Pair of Parentheses | |
| 1213 | Intersection of Three Sorted Arrays | |
| 1229 | Meeting Scheduler | |
| 1233 | Remove Sub-Folders from the Filesystem | |
| 1248 | Count Number of Nice Subarrays | |
| 1257 | Smallest Common Region | |
| 1268 | Search Suggestions System | |
| 1277 | Count Square Submatrices with All Ones | |
| 1280 | Students and Examinations | |
| 1293 | Shortest Path in a Grid with Obstacles Elimination | |
| 1310 | XOR Queries of a Subarray | |
| 1331 | Rank Transform of an Array | |
| 1334 | Find the City With the Smallest Number of Neighbors at a Threshold Distance | |
| 1342 | Number of Steps to Reduce a Number to Zero | |
| 1367 | Linked List in Binary Tree | |
| 1371 | Find the Longest Substring Containing Vowels in Even Counts | |
| 1378 | Replace Employee ID with the Unique Identifier | |
| 1380 | Lucky Numbers in a Matrix | |
| 1381 | Design a Stack With Increment Operation | |
| 1382 | Balance a Binary Search Tree | |
| 1395 | Count Number of Teams | |
| 1405 | Longest Happy String | |
| 1429 | First Unique Number | |
| 1438 | Longest Continuous Subarray with Limit | |
| 1448 | Count Good Nodes in Binary Tree | |
| 1460 | Make Two Arrays Equal by Reversing Subarrays | |
| 1480 | Running Sum of 1d Array | |
| 1497 | Check If Array Pairs Are Divisible by k | |
| 1482 | Minimum Number of Days to Make m Bouquets | |
| 1508 | Range Sum of Sorted Subarray Sums | |
| 1509 | Minimum Difference Between Largest and Smallest Value in Three Moves | |
| 1514 | Path with Maximum Probability | |
| 1518 | Water Bottles | |
| 1530 | Number of Good Leaf Nodes Pairs | |
| 1545 | Find Kth Bit in Nth Binary String | |
| 1550 | Three Consecutive Odds | |
| 1552 | Magnetic Force Between Two Balls | |
| 1568 | Minimum Number of Days to Disconnect Island | |
| 1574 | Shortest Subarray to be Removed to Make Array Sorted | |
| 1579 | Remove Max Number of Edges to Keep Graph Fully Traversable | |
| 1581 | Customer Who Visited but Did Not Make Any Transactions | |
| 1590 | Make Sum Divisible by P | |
| 1593 | Split a String Into the Max Number of Unique Substrings | |
| 1598 | Crawler Log Folder | |
| 1605 | Find Valid Matrix Given Row and Column Sums | |
| 1636 | Sort Array by Increasing Frequency | |
| 1653 | Minimum Deletions to Make String Balanced | |
| 1661 | Average Time of Process Per Machine | |
| 1671 | Minimum Number of Removals to Make Mountain Array | |
| 1683 | Invalid Tweets | |
| 1684 | Count the Number of Consistent Strings |  |
| 1701 | Average Waiting Time | |
| 1717 | Maximum Score From Removing Substrings | |
| 1757 | Recyclable and Low Fat Products | |
| 1768 | Merge Strings Alternately | |
| 1791 | Find Center of Star Graph | |
| 1813 | Sentence Similarity III | |
| 1823 | Find the Winner of the Circular Game | |
| 1829 | Maximum XOR for Each Query | |
| 1851 | Minimum Interval to Include Each Query | |
| 1894 | Find the Student that Will Replace the Chalk | |
| 1899 | Merge Triplets to Form Target Triplet | |
| 1905 | Count Sub Islands | |
| 1934 | Confirmation Rate | |
| 1937 | Maximum Number of Points with Cost | |
| 1942 | The Number of the Smallest Unoccupied Chair | |
| 1945 | Sum of Digits of String After Convert | |
| 1957 | Delete Characters to Make Fancy String | |
| 1963 | Minimum Number of Swaps to Make the String Balanced | |
| 2022 | Convert 1D Array Into 2D Array | |
| 2028 | Find Missing Observations | |
| 2037 | Minimum Number of Moves to Seat Everyone | |
| 2045 | Second Minimum Time to Reach Destination | |
| 2053 | Kth Distinct String in an Array | |
| 2058 | Find the Minimum and Maximum Number of Nodes Between Critical Points | |
| 2064 | Minimized Maximum of Products Distributed to Any Store | |
| 2070 | Most Beautiful Item for Each Query | |
| 2096 | Step-By-Step Directions From a Binary Tree Node to Another | |
| 2107 | Number of Unique Flavors After Sharing K Candies | |
| 2134 | Minimum Swaps to Group All 1's Together II | |
| 2181 | Merge Nodes in Between Zeros | |
| 2191 | Sort the Jumbled Numbers | |
| 2192 | All Ancestors of a Node in a Directed Acyclic Graph | |
| 2196 | Create Binary Tree From Descriptions | |
| 2220 | Minimum Bit Flips to Convert Number | |
| 2248 | Intersection of Multiple Arrays | |
| 2275 | Largest Combination With Bitwise AND Greater Than Zero | |
| 2285 | Maximum Total Importance of Roads | |
| 2326 | Spiral Matrix IV | |
| 2392 | Build a Matrix With Conditions | |
| 2406 | Divide Intervals Into Minimum Number of Groups | |
| 2416 | Sum of Prefix Scores of Strings | |
| 2418 | Sort the People | |
| 2419 | Longest Subarray With Maximum Bitwise AND | |
| 2458 | Height of Binary Tree After Subtree Removal Queries | |
| 2463 | Minimum Total Distance Traveled | |
| 2490 | Circular Sentence | |
| 2491 | Divide Players Into Teams of Equal Skill | |
| 2501 | Longest Square Streak in an Array | |
| 2530 | Maximal Score After Applying K Operations | |
| 2563 | Count the Number of Fair Pairs | |
| 2582 | Pass the Pillow | |
| 2583 | Kth Largest Sum in a Binary Tree | |
| 2601 | Prime Subtraction Operation | |
| 2641 | Cousins in Binary Tree II | |
| 2678 | Number of Senior Citizens | |
| 2684 | Maximum Number of Moves in a Grid | |
| 2699 | Modify Graph Edge Weights | |
| 2707 | Extra Characters in a String | |
| 2751 | Robot Collisions | |
| 2807 | Insert Greatest Common Divisors in Linked List | |
| 2914 | Minimum Number of Changes to Make Binary String Beautiful | |
| 2938 | Separate Black and White Balls | |
| 2969 | Minimum String Length After Removing Substrings | |
| 2976 | Minimum Cost to Convert String I | |
| 3011 | Find if Array Can Be Sorted | |
| 3016 | Minimum Number of Pushes to Type Word II | |
| 3024 | Type of Triangle | |
| 3028 | Ant on the Boundary | |
| 3043 | Find the Length of the Longest Common Prefix | |
| 3097 | Shortest Subarray With OR at Least K II | |
| 3133 | Minimum Array End | |
| 3153 | Sum of Digit Differences of All Pairs | |
| 3163 | String Compression III | |
| 3217 | Delete Nodes From Linked List Present in Array | |
| 3318 | Find X-Sum of All K-Long Subarrays I | |