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Daily LeetCode Solutions with Multi-Language Implementations A structured learning repository featuring daily LeetCode problem solutions in Java and JavaScript, complete with detailed explanations, complexity analysis, and systematic documentation for mastering algorithmic problem-solving.

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LeetCode Daily Solutions

A structured repository for tracking and documenting daily LeetCode problem solutions. This repository serves as a learning resource for improving algorithmic problem-solving skills through consistent practice and detailed documentation.

Purpose

This repository is created for learning and educational purposes. The goal is to:

  • Develop systematic problem-solving approaches
  • Practice implementing solutions in multiple programming languages
  • Document thought processes and algorithmic strategies
  • Track progress and maintain consistency in daily practice
  • Build a comprehensive reference for common algorithmic patterns

Progress Overview

Date Problem ID Problem Title Difficulty Folder Link
2025-08-22 3191 Find the Minimum Area to Cover All Ones I Medium Link
2025-08-21 1504 Count Submatrices with All Ones Medium Link
2025-08-20 1277 Count Square Submatrices with All Ones Medium Link
2025-08-19 2348 Number of Zero-Filled Subarrays Medium Link
2025-08-18 679 24 Game Hard Link
2025-08-17 837 New 21 Game Medium Link
2025-08-16 1323 Maximum 69 Number Easy Link
2025-08-15 342 Power of Four Easy Link
2025-08-14 2264 Largest 3-Same-Digit Number in String Easy Link
2025-08-13 326 Power of Three Easy Link
2025-08-12 2787 Ways to Express Integer as Sum of Powers Medium Link
2025-08-11 2438 Range Product Queries of Powers Medium Link
2025-08-10 869 Reordered Power of 2 Easy Link
2025-08-09 231 Power of Two Easy Link
2025-08-08 808 Soup Servings Medium Link
2025-08-07 - Find the Maximum Number of Fruits Collected Medium Link
2025-08-06 3478 Fruits Into Baskets III Medium Link
2025-08-05 3477 Fruits Into Baskets II Easy Link
2025-08-04 904 Fruit Into Baskets Medium Link
2025-08-03 2106 Maximum Fruits Harvested After at Most K Steps Hard Link
2025-08-02 2857 Rearranging Fruits Hard Link
2025-08-01 118 Pascal's Triangle Easy Link
2025-07-31 898 Bitwise ORs of Subarrays Medium Link
2025-07-30 2412 Longest Subarray with Maximum Bitwise AND Medium Link
2025-07-29 2411 Smallest Subarrays With Maximum Bitwise OR Medium Link
2025-07-29 2044 Count Number of Maximum Bitwise OR Subsets Medium Link

Blind 75 Problems

The repository also includes solutions for the Blind 75 - a curated list of the most important coding interview questions. These problems are organized by category and cover essential algorithmic concepts.

Blind 75 Categories:

  • Array: Two Sum, 3Sum, Container With Most Water, Best Time to Buy and Sell Stock, etc.
  • Binary: Counting Bits, Missing Number, Number of 1 Bits, Reverse Bits, etc.
  • Dynamic Programming: Climbing Stairs, Coin Change, House Robber, Longest Increasing Subsequence, etc.
  • Graph: Clone Graph, Course Schedule, Number of Islands, Word Search, etc.
  • Heap: Find Median from Data Stream, Kth Largest Element, Merge K Sorted Lists, etc.
  • Interval: Meeting Rooms, Merge Intervals, Non-overlapping Intervals, etc.
  • Linked List: Reverse Linked List, Merge Two Sorted Lists, Remove Nth Node From End, etc.
  • Matrix: Rotate Image, Set Matrix Zeroes, Word Search, etc.
  • String: Longest Substring Without Repeating Characters, Valid Anagram, Valid Parentheses, etc.
  • Tree: Maximum Depth of Binary Tree, Invert Binary Tree, Validate Binary Search Tree, etc.

Blind 75 Progress:

  • Total Blind 75 Problems: 75
  • Completed: 75 (100%)
  • Solutions Available: Java, JavaScript, and Python for all problems

NeetCode 150 Problems

The repository now includes complete solutions for the NeetCode 150 - an expanded list of essential coding interview questions that builds upon the Blind 75. This comprehensive collection covers all major algorithmic patterns and data structures.

NeetCode 150 Categories:

  • Arrays & Hashing (9 problems): Contains Duplicate, Valid Anagram, Two Sum, Group Anagrams, etc.
  • Two Pointers (5 problems): Valid Palindrome, Two Sum II, 3Sum, Container With Most Water, etc.
  • Sliding Window (6 problems): Best Time to Buy and Sell Stock, Longest Substring Without Repeating Characters, etc.
  • Stack (7 problems): Valid Parentheses, Min Stack, Evaluate Reverse Polish Notation, etc.
  • Binary Search (7 problems): Binary Search, Search 2D Matrix, Koko Eating Bananas, etc.
  • Linked List (11 problems): Reverse Linked List, Linked List Cycle, Merge Two Sorted Lists, etc.
  • Trees (8 problems): Invert Binary Tree, Maximum Depth of Binary Tree, Diameter of Binary Tree, etc.
  • Tries (3 problems): Implement Trie, Design Add and Search Words Data Structure, Word Search II
  • Backtracking (7 problems): Subsets, Combination Sum, Permutations, Word Search, etc.
  • Heap/Priority Queue (7 problems): Kth Largest Element in a Stream, Last Stone Weight, Task Scheduler, etc.
  • Graphs (13 problems): Number of Islands, Clone Graph, Pacific Atlantic Water Flow, etc.
  • Advanced Graphs (6 problems): Reconstruct Itinerary, Min Cost to Connect All Points, Network Delay Time, etc.
  • 1D Dynamic Programming (8 problems): Climbing Stairs, House Robber, Longest Palindromic Substring, etc.
  • 2D Dynamic Programming (8 problems): Unique Paths, Longest Common Subsequence, Edit Distance, etc.
  • Greedy (8 problems): Maximum Subarray, Jump Game, Gas Station, Hand of Straights, etc.
  • Intervals (7 problems): Insert Interval, Merge Intervals, Non-overlapping Intervals, etc.
  • Math & Geometry (9 problems): Rotate Image, Spiral Matrix, Set Matrix Zeroes, Power of Two, etc.
  • Bit Manipulation (5 problems): Single Number, Reverse Integer, Add Binary, Single Number II, etc.

NeetCode 150 Progress:

  • Total NeetCode 150 Problems: 134
  • Completed: 134 (100%)
  • Solutions Available: Java, JavaScript, and Python for all problems
  • Categories Completed: 18/18 (100%)

Repository Structure

LeetCode-Daily-Solutions/
│
├── README.md                     # Index of all problems
├── blind-75/                    # Blind 75 curated problems by category
├── neetcode-150/                # NeetCode 150 comprehensive problems by category
│   ├── arrays-hashing/          # Arrays & Hashing problems
│   ├── two-pointers/            # Two Pointers problems
│   ├── sliding-window/          # Sliding Window problems
│   ├── stack/                   # Stack problems
│   ├── binary-search/           # Binary Search problems
│   ├── linked-list/             # Linked List problems
│   ├── trees/                   # Trees problems
│   ├── tries/                   # Tries problems
│   ├── backtracking/           # Backtracking problems
│   ├── heap/                    # Heap/Priority Queue problems
│   ├── graphs/                  # Graphs problems
│   ├── advanced-graphs/         # Advanced Graphs problems
│   ├── 1d-dp/                   # 1D Dynamic Programming problems
│   ├── 2d-dp/                   # 2D Dynamic Programming problems
│   ├── greedy/                  # Greedy problems
│   ├── intervals/               # Intervals problems
│   ├── math-geometry/           # Math & Geometry problems
│   └── bit-manipulation/        # Bit Manipulation problems
├── Easy/                        # Easy difficulty problems
├── Medium/                      # Medium difficulty problems
├── Hard/                        # Hard difficulty problems
└── .github/
    └── workflows/               # GitHub Actions (future)

Problem Template

Each problem folder follows the structure:

YYYY-MM-DD-ProblemID-Title/
├── solution.java                # Java solution code
├── solution.js                  # JavaScript solution code
├── solution.py                  # Python solution code
└── explanation.md               # Problem statement, approach, complexities

Statistics

Daily Problems:

  • Total Problems Solved: 25
  • Easy: 8
  • Medium: 15
  • Hard: 2

Curated Problem Sets:

  • Blind 75: 75 problems (100% complete)
  • NeetCode 150: 134 problems (100% complete)
  • Total Curated Problems: 209 problems

Overall Repository:

  • Total Problems: 234 problems
  • Languages: Java, JavaScript, Python
  • Categories: 18 algorithmic categories
  • Documentation: Comprehensive explanations for all problems

Getting Started

  1. Create a new problem folder using the format: YYYY-MM-DD-ProblemID-Title
  2. Add your solution code in solution.java, solution.js, and solution.py
  3. Document your approach in explanation.md
  4. Update this README with the new problem entry

Documentation Standards

Each problem includes:

  • Problem Statement: Clear description of the problem requirements
  • Examples: Sample inputs and expected outputs
  • Approach: Step-by-step explanation of the solution strategy
  • Complexity Analysis: Time and space complexity breakdown
  • Key Insights: Important observations and learning points
  • Alternative Approaches: Other possible solution methods
  • Multi-language Solutions: Implementations in Java, JavaScript, and Python

Learning Objectives

  • Master fundamental data structures and algorithms
  • Develop efficient problem-solving strategies
  • Practice code optimization and performance analysis
  • Improve understanding of time and space complexity
  • Build confidence in tackling algorithmic challenges

Notes

  • All solutions are organized by difficulty level and category
  • Each problem includes solutions in Java, JavaScript, and Python
  • Detailed explanations and complexity analysis included
  • Solutions are date-stamped for tracking progress
  • Focus on understanding rather than memorization
  • Comprehensive coverage of all major algorithmic patterns

🎯 Learning Outcomes

Through completing the Blind 75 and NeetCode 150, you will have mastered:

  • Data Structures: Arrays, Hash Tables, Stacks, Queues, Trees, Graphs, Tries, Heaps
  • Algorithms: Sorting, Searching, Dynamic Programming, Greedy, Backtracking, Graph Algorithms
  • Patterns: Two Pointers, Sliding Window, Binary Search, Bit Manipulation, Interval Scheduling
  • Complexity Analysis: Time and space complexity optimization
  • Problem-Solving Skills: Systematic approach to tackling algorithmic challenges

This repository is maintained for educational purposes and continuous learning in algorithmic problem-solving. The completion of both Blind 75 and NeetCode 150 represents a significant milestone in coding interview preparation.- 2025-08-28 — Sort Matrix by Diagonals (Medium) → Medium/2025-08-28-3446-Sort-Matrix-by-Diagonals

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Daily LeetCode Solutions with Multi-Language Implementations A structured learning repository featuring daily LeetCode problem solutions in Java and JavaScript, complete with detailed explanations, complexity analysis, and systematic documentation for mastering algorithmic problem-solving.

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