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Top 10 Beginner-Friendly LeetCode Questions and Their Solutions

If you're new to solving coding problems on LeetCode, it can feel overwhelming. Where do you start? Which problems are suitable for beginners? Don’t worry! In this blog post, I’ll guide you through 10 beginner-friendly LeetCode questions that are perfect for getting started on your coding journey. These problems will help you build confidence, improve your problem-solving skills, and lay a solid foundation in data structures and algorithms. Why Start with Beginner-Friendly Problems? Before diving into advanced topics like dynamic programming or graph theory, it’s essential to: Build a strong foundation in basic programming concepts. Understand how to approach a coding problem methodically. Gain familiarity with LeetCode’s platform and its problem structure. The following problems are simple yet impactful, designed to introduce you to common techniques like loops, arrays, strings, and basic math operations. 10 Beginner-Friendly LeetCode Problems 1. Two Sum (Easy) Problem Link : Two...

LeetCode 2583: Kth Largest Sum in a Binary Tree – Solution Explained

When working with binary trees, one common task is to analyze the properties of the tree's levels. In this blog post, we'll walk through a solution to LeetCode Problem 2583: Kth Largest Sum in a Binary Tree , a problem that challenges us to compute and find specific sums from different levels of a binary tree. Problem Statement You are given the root of a binary tree and a positive integer k . Your goal is to return the k-th largest level sum in the tree. The level sum is defined as the sum of the values of all nodes at the same depth in the tree. If the number of levels in the tree is less than k , the function should return -1 . Example 1: Input: root = [5, 8, 9, 2, 1, 3, 7, 4, 6] , k = 2 Output: 13 Explanation: Level 1 sum: 5 Level 2 sum: 8 + 9 = 17 Level 3 sum: 2 + 1 + 3 + 7 = 13 Level 4 sum: 4 + 6 = 10 The 2nd largest sum is 13 . Example 2: Input: root = [1, 2, null, 3] , k = 1 Output: 3 Explanation: The largest level sum is 3 (at the third level). This problem essentia...

LeetCode 3370: Smallest Number With All Set Bits – Problem Explanation and Solutions

Are you looking to master bit manipulation and tackle interesting coding challenges? In this post, we’ll explore LeetCode Problem 3370: Smallest Number With All Set Bits . We’ll dive deep into the problem statement, break down a brute force approach, and finally discuss an optimized solution. If you’re preparing for technical interviews or just love solving algorithmic problems, this guide is for you! Problem Statement: Smallest Number With All Set Bits You are given a positive integer n . Your task is to find the smallest number x such that: x is greater than or equal to n . The binary representation of x consists only of set bits ( 1 s). Examples: Example 1: Input: n = 5 Output: 7 Explanation: The binary representation of 7 is 111 , which is the smallest number greater than or equal to 5 with all bits set. Example 2: Input: n = 10 Output: 15 Explanation: The binary representation of 15 is 1111 . Example 3: Input: n = 3 Output: 3 Explanation: The binary representation of 3 is...