Subsets II | Backtracking
leetcode.com Problem Statement Given an integer array nums that may contain duplicates, return all possible subsets (the power set). The solution must…
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Max Consecutive Ones
Problem Statement Given a binary array nums , return the maximum number of consecutive 1's present in the array. Example Input: nums = [1,1,0,1,1,1] O…
Remove Duplicates from Sorted Array
Problem Statement Given a sorted integer array nums , remove the duplicates in-place such that each unique element appears only once. Return the numbe…
Java Solution - LeetCode Problem 1 Two Sum
Problem Description: Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to the target. You…
System Design Interview Roadmap (10 Concepts That Matter Most)
Disclosure: This post includes affiliate links; I may receive compensation if you purchase products or services from the different links provided in t…
Linked List Cycle II
leetcode.com Problem Statement Given the head of a linked list, return the node where the cycle begins. If there is no cycle, return null . You are no…
Palindrome Linked List
leetcode.com Problem Statement Given the head of a singly linked list, return true if the linked list is a palindrome and false otherwise. Example 1 I…
Reverse Nodes in K-Group
leetcode.com Among all Linked List problems, Reverse Nodes in K-Group is one of the most challenging and interview-favorite questions because it combi…
Linked List Cycle Detection
leetcode.com Cycle detection is one of the most classic Linked List interview problems. At first, it may look like we need extra memory to track visit…
I Got Bored of LeetCode, so I Built a Coding RPG
https://dsa-life-simulator-frontend.vercel.app"I made a free tool to make DSA practice feel like an RPG — would like feedback from this community"Been…
Delete Node in a Linked List
Problem Link - https://leetcode.com/problems/delete-node-in-a-linked-list/ This is one of those interview questions that looks impossible at first. No…
Learn Leetcode daily with Claude code mentor
This is a submission for the GitHub Finish-Up-A-Thon Challenge What I Built After being abandoned for several months, I have come back to build and co…
Reverse Pairs
Given an integer array nums , return the number of reverse pairs. A reverse pair is defined as: i < j && nums [ i ] > 2 * nums [ j ] Bru…
Sort Colors (Dutch National Flag Algorithm)
Given an array containing only 0 , 1 , and 2 , sort it in-place so that all 0s come first, followed by 1s , and then 2s . Example: Input: [2,0,2,1,1,0…
LeetCode Solution: 3. Longest Substring Without Repeating Characters
3. Longest Substring Without Repeating Characters 🟡 Medium Hey Dev.to fam! 👋 Today, we're diving into a LeetCode classic that’s a fantastic introducti…
2487. Remove Nodes From Linked List
In this post i'm gone explain liked list an famous leetcode problem that is " Remove Nodes from linked list ". Problem Statement: You are given the he…
Tree Traversal: Why the Order You Pick Is a Data Flow Decision
Tree traversal usually gets taught as three separate algorithms to memorize: preorder, inorder, postorder. They are not three algorithms. They are one…
LeetCode Solution: 1. Two Sum
Your First LeetCode Journey: Conquering 'Two Sum' (Problem 1) with Ease! Hey fellow developers! 👋 Kushalx here, and today we're diving into the absolu…
LeetCode Solution: 1752. Check if Array Is Sorted and Rotated
🔄 LeetCode 1752: Can You Un-Rotate This Array? (A Beginner's Guide) Hey there, fellow coders! 👋 Vansh2710 here, ready to demystify another exciting Le…
Interview Sheet Q2:- 121. Best Time to Buy and Sell Stock
Approach 1: Brute Force Try every possible buy day. For each buy day, try every sell day after it. Calculate profit and keep maximum. class Solution {…
Leetcode QOTD:- 33. Search in Rotated Sorted Array
Normally binary search works only on fully sorted arrays, but here one half is always sorted, and that is the key logic. Main Idea At every step: Find…
LeetCode Solution: 13. Roman to Integer
How to Conquer Roman Numerals: LeetCode #13 Explained Simply! Hey there, future coding superstar! 👋 Ever looked at Roman numerals and thought, "That's…
LeetCode Solution: 12. Integer to Roman
Unraveling the Mystery of Roman Numerals: A LeetCode Journey (Problem 12. Integer to Roman) Hey LeetCoders and aspiring developers! 👋 Today, we're tak…
Median of Two Sorted Arrays — LeetCode #4 (Hard)
The Problem Given two sorted arrays, return the median of all their elements combined, in logarithmic time. Example Input: nums1 = [1,3], nums2 = [2] …
Longest Substring Without Repeating Characters — LeetCode #3 (Medium)
The Problem Given a string s, return the length of the longest substring that contains no duplicate characters. Example Input: s = "abcabcbb" Output: …
3 and 4 Sum optimized Approach
3 Sum problem(2 pointer approach) Here,I discussed classic problem of both 3 Sum and 4 Sum problem. 3 Sum Problem Problem Statement Find all unique tr…
LeetCode Solution: 146. LRU Cache
LRU Cache: Because Your Computer Has Commitment Issues (LeetCode 146) Hello, fellow coders and aspiring digital hoarders! Today, we're diving into a L…
Two Sum — LeetCode #1 (Easy)
TL;DR Single-pass hash map lookup: store each number's index as you go, check for the complement before storing. O(n) time, O(n) space. The Problem Gi…
LeetCode Solution: 5. Longest Palindromic Substring
Longest Palindromic Substring: A Core String Algorithm Explained Welcome to another deep dive into a classic LeetCode problem! Today, we're tackling P…
Leetcode 2
I did LeetCode 2. Yup. That’s the headline. The classic Add Two Numbers. Submitted my solution thanks to the tremendous help of ChatGPT, but I still f…