- Array
- Bit Manipulation
- Dynamic Programming
- Linked List
- Math
- Queue
- Stack
- String
- Tree
- Database - SQL Queries
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0001 | Two Sum | Java | Easy | Array, Hash Table |
| 0026 | Remove Duplicates from Sorted Array | Java | Easy | Array, Two Pointers |
| 0046 | Permutations | Java | Medium | Array, Backtracking |
| 0055 | Jump Game | Java | Medium | Array, Dynamic Programming, Greedy |
| 0066 | Plus One | Java | Easy | Array, Math |
| 0088 | Merge Sorted Array | Java | Easy | Array, Two Pointers, Sorting |
| 0118 | Pascal's Triangle | Java | Easy | Array, Dynamic Programming |
| 0134 | Gas Station | Java | Medium | Array, Greedy |
| 0136 | Single Number | Java | Easy | Array, Bit Manipulation |
| 0162 | Find Peak Element | C# | Medium | Array, Binary Search |
| 0169 | Majority Element | Java | Easy | Array, Hash Table, Divide and Conquer, Sorting, Counting |
| 0189 | Rotate Array | Java | Medium | Array, Math, Two Pointer |
| 0217 | Contains Duplicate | Java | Easy | Array, Hash Table, Sorting |
| 0283 | Move Zeroes | Python3, TypeScript | Easy | Array, Two Pointers |
| 0463 | Island Perimeter | Java | Easy | Array, Depth-First Search, Breadth-First Search, Matrix |
| 0496 | Next Greater Element I | Python3, TypeScript | Easy | Array, Hash Table, Stack, Monotonic Stack |
| 0500 | Keyboard Row | Java | Easy | Array, Hash Table, String |
| 0566 | Reshape the Matrix | Python3, TypeScript | Easy | Array, Matrix, Simulation |
| 0605 | Can Place Flowers | Java | Easy | Array, Greedy |
| 0733 | Flood Fill | Java | Easy | Array, Depth-First Search, Breadth-First Search, Matrix |
| 0860 | Lemonade Change | Java | Easy | Array, Greedy |
| 0976 | Largest Perimeter Triangle | Python3, TypeScript | Easy | Array, Math, Greedy, Sorting |
| 0997 | Find the Town Judge | Java | Easy | Array, Hash Table, Graph |
| 1232 | Check If It Is a Straight Line | Python3, TypeScript | Easy | Array, Math, Geometry |
| 1480 | Running Sum of 1d Array | Python3, TypeScript | Easy | Array, Prefix Sum |
| 1491 | Average Salary Excluding the Minimum and Maximum Salary | Python3, TypeScript | Easy | Array, Sorting |
| 1502 | Can Make Arithmetic Progression From Sequence | Python3, TypeScript | Easy | Array,Sorting |
| 1572 | Matrix Diagonal Sum | Python3, TypeScript | Easy | Array, Matrix |
| 1588 | Sum of All Odd Length Subarrays | Java, Python3, TypeScript | Easy | Array, Math, Prefix Sum |
| 1672 | Richest Customer Wealth | Python3, TypeScript | Easy | Array, Matrix |
| 1779 | Find Nearest Point That Has the Same X or Y Coordinate | Python3, TypeScript | Easy | Array |
| 1822 | Sign of the Product of an Array | Python3, TypeScript | Easy | Array, Math |
| 2053 | Kth Distinct String in an Array | Java, Python3 | Easy | Array, Hash Table, String, Counting |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0191 | Number of 1 Bits | Python3, TypeScript | Easy | Divide and Conquer, Bit Manipulation |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0053 | Maximum Subarray | Java | Easy | Array, Divide Conquer, Dynamic Programming |
| 0062 | Unique Paths | Java | Medium | Math, Dynamic Programming, Combinatorics |
| 0070 | Climbing Stairs | Java | Easy | Math,Dynamic Programming,Memoization |
| 0746 | Min Cost Climbing Stairs | Java | Easy | Array, Dynamic Programming |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0021 | Merge Two Sorted Lists | Java | Easy | Linked List, Recursion |
| 0141 | Linked List Cycle | Java | Easy | Linked List, Hash Table, Two Pointers |
| 0203 | Remove Linked List Elements | Java | Easy | Linked List, Recursion |
| 0237 | Delete Node in a Linked List | Java | Easy | Linked List |
| 0876 | Middle of the Linked List | Python3, TypeScript | Easy | Linked List, Two Pointers |
| 1290 | Convert Binary Number in a Linked List to Integer | Python3, TypeScript | Easy | Linked List, Math |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0050 | Pow(x, n) | Java | Medium | Math, Recursion |
| 0069 | Sqrt(x) | Java | Easy | Math, Binary Search |
| 0171 | Excel Sheet Column Number | Java | Easy | Math, String |
| 0202 | Happy Number | Java, Python3, TypeScript | Easy | Hash Table, Math, Two Pointer |
| 0231 | Power of Two | Java | Easy | Math, Bit Manipulation, Recursion |
| 0412 | Fizz Buzz | Java | Easy | Math, String |
| 0509 | Fibonacci Number | Java | Easy | Math, Dynamic Programming, Recursion, Memoization |
| 1281 | Subtract the Product and Sum of Digits of an Integer | Python3, TypeScript | Easy | Math |
| 1523 | Count Odd Numbers in an Interval Range | Python3, TypeScript | Easy | Math |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0232 | Implement Queue using Stacks | Java | Easy | Stack, Design, Queue |
| 0933 | Number of Recent Calls | Java | Easy | Design, Queue, Data Stream |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0155 | Min Stack | Java | Easy | Stack, Design |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0013 | Roman to Integer | Java | Easy | Hash Table, Math, String |
| 0014 | Longest Common Prefix | Java | Easy | String |
| 0020 | Valid Parentheses | Java | Easy | String, Stack |
| 0028 | Implement strStr() | Java | Easy | Two Pointers, String, String Matching |
| 0038 | Count and Say | Java | Medium | String |
| 0125 | Valid Palindrome | Java | Easy | String, Two Pointers |
| 0179 | Largest Number | Java | Medium | String, Greedy, Sorting |
| 0242 | Valid Anagram | Java | Easy | String, Hash Table, Sorting |
| 0344 | Reverse String | Java | Easy | String, Two Pointers, Recursion |
| 0383 | Ransom Note | Python3, TypeScript | Easy | Hash Table, String, Counting |
| 0389 | Find the Difference | Python3, TypeScript | Easy | Hash Table, String, Bit Manipulation, Sorting |
| 0551 | Student Attendance Record I | Java | Easy | String |
| 0709 | To Lower Case | Python3, TypeScript | Easy | String |
| 0830 | Positions of Large Groups | Java | Easy | String |
| 1154 | Day of the Year | Java | Easy | Math, String |
| 1221 | Split a String in Balanced Strings | Java | Easy | String, Greedy, Counting |
| 1309 | Decrypt String from Alphabet to Integer Mapping | Python3, TypeScript | Easy | String |
| 1678 | Goal Parser Interpretation | Python3, TypeScript | Easy | String |
| 1768 | Merge Strings Alternately | Python3, TypeScript | Easy | Two Pointers,String |
| 1790 | Check if One String Swap Can Make Strings Equal | Python3, TypeScript | Easy | Hash Table, String, Counting |
| 2264 | Largest 3-Same-Digit Number in String | Java | Easy | String |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 0094 | Binary Tree Inorder Traversal | Java | Easy | Stack, Tree, Depth-First Search, Binary Tree |
| 0101 | Symmetric Tree | Java | Easy | Tree, Depth-First Search, Breadth-First Search, Binary Tree |
| 0104 | Maximum Depth of Binary Tree | Java | Easy | Tree, Depth-Frist Search, Breadth-First Search, Binary Tree |
| 0108 | Convert Sorted Array to Binary Search Tree | Java | Easy | Array, Divide and Conquer, Tree, Binary Search Tree, Binary Tree |
| 0112 | Path Sum | Java | Easy | Tree, Depth-First Search, Breadth-First Search, Binary Tree |
| 0144 | Binary Tree Preorder Traversal | Java | Easy | Stack, Tree, Depth-First Search, Binary Tree |
| 0145 | Binary Tree Postorder Traversal | Java | Easy | Stack, Tree, Depth-First Search, Binary Tree |
| 0235 | Lowest Common Ancestor of a Binary Search Tree | Java | Easy | Tree, Depth-First Search, Binary Search Tree, Binary Tree |
| 0572 | Subtree of Another Tree | Java | Easy | Tree, Depth-First Search, String Matching, Binary Tree, Hash Function |
| 0589 | N-ary Tree Preorder Traversal | Python3, TypeScript | Easy | Stack, Tree, Depth-First Search |
| 0700 | Search in a Binary Search Tree | Java | Easy | Tree, Binary Search Tree, Binary Tree |
| 0704 | Binary Search | Java | Easy | Array, Binary Search |
| # | Title | Solution | Difficulty | Tags |
|---|---|---|---|---|
| 1075 | Project Employees I | MySQL | Easy | Database |
| 1251 | Average Selling Price | MySQL | Easy | Database |
On command palette, run Java: Clean Java Language workspace