This repository contains my daily DSA (Data Structures & Algorithms) practice from LeetCode, with real-world relatable examples and clean Python solutions.
Each problem includes its level, topic, and a direct code link for easy reference.
| # | Problem Title | Level | Topics | Code Link |
|---|---|---|---|---|
| 1 | Remove Element (27) | Easy | Arrays, Two Pointers | Code |
| 2 | Merge Sorted Array (88) | Easy | Arrays, Two Pointers | Code |
| 3 | Remove Duplicates from Sorted Array | Easy | Arrays, Two Pointers | Code |
| 4 | Remove Duplicates II from Sorted Array (80) | Medium | Arrays, Two Pointers | Code |
| 5 | Product of Array Except Self (238) | Medium | Prefix, Arrays | Code |
| 6 | Gas Station (134) | Medium | Greedy | Code |
| 7 | Candy (135) | Hard | Greedy | Code |
| 8 | Trapping Rain Water (42) | Hard | Two Pointers, Stack | Code |
| 9 | Roman to Integer (13) | Easy | HashMap, Greedy | Code |
| 10 | Integer to Roman (12) | Medium | Greedy, Arrays | Code |
| 11 | Length of Last Word (58) | Easy | Strings | Code |
| 12 | Longest Common Prefix (14) | Easy | Strings | Code |
| 13 | Reverse Words in a String (151) | Medium | Strings | Code |
| 14 | Zigzag Conversion (6) | Medium | Strings, Simulation | Code |
| 15 | Find Index of First Occurrence in String (28) | Easy | Strings | Code |
| 16 | Text Justification (68) | Hard | Strings, Formatting | Code |
| 17 | Jump Game I (55) | Medium | Greedy, DP | Code |
| 18 | Jump Game II (45) | Medium | Greedy | Code |
| 19 | H-Index (274) | Medium | Sorting | Code |
| 20 | Insert Delete GetRandom O(1) (380) | Medium | HashMap, Design | Code |
| 21 | Valid Palindrome (125) | Easy | Two Pointers, String | Code |
| 22 | Is Subsequence (392) | Easy | Two Pointers, String | Code |
| 23 | Two Sum II - Input Array Is Sorted (167) | Easy | Two Pointers | Code |
| 24 | Container With Most Water (11) | Medium | Two Pointers | Code |
| 25 | 3Sum (15) | Medium | Two Pointers, Sorting | Code |
| 26 | Best Time to Buy and Sell Stock (121) | Easy | Greedy | Code |
| 27 | Best Time to Buy and Sell Stock II (122) | Medium | Greedy | Code |
| 28 | Majority Element (169) | Easy | HashMap, Voting Algorithm | Code |
| 29 | Minimum Size Subarray Sum (209) | Medium | Two Pointers | Code |
| 30 | Longest Substring Without Repeating Characters (3) | Medium | HashMap, Sliding Window | Code |
| 31 | Substring with Concatenation of All Words (30) | Hard | HashMap, Sliding Window | Code |
| 32 | Minimum Window Substring (76) | Hard | Sliding Window, HashMap | Code |
| 33 | Rotate Array (189) | Medium | Arrays, Rotation | Code |
| 34 | Valid Sudoku (36) | Medium | Hashing, Matrix | Code |
| 35 | Spiral Matrix (54) | Medium | Matrix, Simulation | Code |
| 36 | Rotate Matrix (Custom) | Medium | Matrix, In-place | Code |
| 37 | Set Matrix Zeroes (73) | Medium | Matrix | Code |
| 38 | Game of Life (289) | Medium | Matrix, Simulation, In-place | Code |
| 39 | Ransom Note (383) | Easy | Hashing, String | Code |
| 40 | Isomorphic Strings (205) | Easy | HashMap, String | Code |
| 41 | Word Pattern (290) | Easy | HashMap, String | Code |
| 42 | Valid Anagram (242) | Easy | HashMap, String, Sorting | Code |
| 43 | Group Anagrams (49) | Medium | HashMap, String, Sorting | Code |
| 44 | Happy Number (202) | Easy | Hashing, Math | Code |
| 45 | Summary Ranges (228) | Easy | Arrays, Two Pointers | Code |
| 46 | Merge Intervals (56) | Medium | Sorting, Arrays, Merging | Code |
| 47 | Insert Interval (57) | Hard | Sorting, Merging, Arrays | Code |
| 48 | Minimum Number of Arrows to Burst Balloons (452) | Medium | Sorting, Intervals, Greedy | Code |
| 49 | Contains Duplicate II (219) | Easy | HashMap, Sliding Window | Code |
| 50 | Valid Parentheses (20) | Easy | Stack, Brackets, Strings | Code |
| 51 | Simplify Path (71) | Medium | Stack, String, Path Simplify | Code |
| 52 | Min Stack (155) | Medium | Stack, Design | Code |
| 53 | Evaluate Reverse Polish Notation (150) | Medium | Stack, Math, Expression Eval | Code |
| 54 | Basic Calculator (224) | Hard | Stack, Math, Parentheses | Code |
| 55 | Linked List Cycle (141) | Easy | Linked List, Hashing | Code |
| 56 | Longest Consecutive Sequence (128) | Hard | HashSet, Sorting | Code |
✨ More LeetCode problems will be added soon...
Stay tuned for:
- Advanced Dynamic Programming
- Graph Algorithms
- Backtracking Challenges
- System Design & Patterns
- Final updated version with explanations & optimized solutions
✨ More LeetCode problems will be added soon...
Stay tuned for:
- Advanced Dynamic Programming
- Graph algorithms
- Backtracking challenges
- System design & patterns
⚙️ Final updated version coming soon — all problems will include detailed explanations and optimized code.
Each folder is organized as:
🔹 Problem: Check if two strings are isomorphic.
🔹 Approach: Use a hashmap to track character mappings.
🔹 Real-Life Example: Comparing two secret codes to see if they follow the same pattern.
- Solve 1 problem every day
- Add real-world relatable examples
- Maintain clean & structured code
- Clone the repo:
git clone https://github.com/<your-username>/leetcode-daily-practice.git
in this it will becdome coomgin soon all leetcode qution is lvoe then final upadatetion is comomig soon ,......git