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Problem: https://leetcode.com/problems/determine-if-string-halves-are-alike/description/ Breaking Down the Solution Converting String to Char Array: The input string s is converted into a character array a. This facilitates easy traversal and access to individual characters. Initialization and Set of Vowels: A HashSet vowels is created to store the vowels that need to be checked. The size of the array…
Problem Statement: https://leetcode.com/problems/amount-of-time-for-binary-tree-to-be-infected/description/ Decoding the Algorithm: 1. Initialization and Connection Mapping: A HashMap (parentChildMap) is used to establish connections between child and parent nodes, essential for navigating the tree. The startNode is identified by traversing the tree until the desired node with the given value (start) is found. 2. Breadth-First Search (BFS): A LinkedList (queue)…
In the realm of algorithms and data structures, the task of merging k sorted linked lists is a familiar challenge. In this blog, we’ll embark on a journey through a naive approach and then pivot to a more optimal solution. Our starting point is a Java solution that might seem intuitive but lacks the efficiency…
Binary Search Trees (BSTs) are a fundamental data structure in computer science, known for their efficient search and retrieval operations. In this blog, we’ll delve into a Java solution for calculating the sum of values within a specified range in a BST. The provided code snippet showcases a recursive approach to achieve this task. Understanding…
Introduction: The problem involves identifying pairs of indices in an array that satisfy certain conditions, with a specific mathematical operation. This blog will discuss the problem, the provided solution, and break down the code for a better understanding. Problem Overview: The goal is to find the count of such nice pairs of indices. Due to…
Problem Statement There is a robot on an m x n grid. The robot is initially located at the top-left corner (i.e., grid[0][0]). The robot tries to move to the bottom-right corner (i.e., grid[m – 1][n – 1]). The robot can only move either down or right at any point in time. Given the two integers m and n, return the number of possible unique paths that…
Efficiency is key when it comes to managing multiple jobs with varying start times, end times, and profits. In such scenarios, making the right choices can lead to a significant increase in overall profit. This is where dynamic programming comes to the rescue. In this blog, we’ll explore a Java solution that optimizes job scheduling…
Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order. Example 1: Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Example 2: Input: nums = [1], k = 1 Output: [1] Constraints: 1 <= nums.length <= 105 -104 <= nums[i] <= 104 k is in the range [1, the number…
Understanding the Problem The problem statement is as follows: Given an array of words, return the k most frequent words. If there are multiple answers, return answers in their lexicographical order The Code We’ll break down the code into sections to understand how it works. Custom Data Structure: Frequency First, we define a custom class called…
https://leetcode.com/problems/snapshot-array/description/ Here’s a breakdown of the code: The class SnapshotArray has a member variable snap which is a HashMap. This HashMap has an Integer key (representing the index) and a nested HashMap as its value. The nested HashMap has an Integer key (representing the snapshot ID) and an Integer value (representing the value at that…