sufiyan iqbal - LearnYard - Free Programming & DSA Blogs | Read, Code, Excel

Sign in Subscribe

sufiyan iqbal

How to Find nPr and nCr Solution In C++/Java/Python/JS

Introduction In the journey of learning Data Structures and Algorithms (DSA), we often come across problems that require counting arrangements, selections, or groupings. Whether it's calculating possibilities in recursion, brute force combinations, or logic puzzles, one concept keeps popping up — Permutation and Combination. Understanding this topic early will

Minimum Number of Operations to Make Word K-Periodic Solution In C++/Java/Python/Javascript

Problem Description You are given a string word of size n and an integer k such that k divides n. In one operation, you can pick any two indices i and j that are divisible by k, then replace the substring of length k starting at i with the substring

Evaluate the Bracket Pairs of a String Solution In C++/Java/Python/Javascript

Problem Description You are given a strings that contains some bracket pairs, with each pair containing a non-empty key. For example, in the string "(name)is(age)yearsold", there are two bracket pairs that contain the keys "name" and "age". You know the values

Group the People Given the Group Size They Belong To Solution In C++/Java/Python/Javascript

Problem Description In this problem, we have n individuals, each identified by a unique ID ranging from 0 to n-1. Every person belongs to a specific group, but instead of being explicitly assigned to a group, they are only given a number indicating how many people should be in their

Convert an Array Into a 2D Array With Conditions Solution In C++/Java/Python/Javascript

Problem Description Imagine you are given a list of numbers and need to transform it into a 2D array while following some rules. Each row in the 2D array must contain distinct numbers—no duplicates are allowed within a row. If a number appears multiple times in the input list,

Finding the Users Active Minutes Solution In C++/Java/Python/Javascript

Problem Description You are given an 2D integer matrix logs , where each entry consists of a pair [ID,time]. The ID represents a user who performed an action at a given time (in minutes). A single user can perform multiple actions at the same minute. Multiple users can perform actions

Number of Laser Beams in a Bank Solution In C++/Python/java/JS

Problem Description A bank's security system is represented as an m x n binary string array bank, where '1' denotes a security device and '0' represents an empty cell. A laser beam is formed between two devices if they are in different rows (r1

Valid Tic-Tac-Toe State Solution In C++/Python/java/JS

Problem Description In this problem, you are given a 3x3 Tic-Tac-Toe board represented as a string array. The goal is to determine if the given board configuration could have been reached through a sequence of valid moves according to the rules of Tic-Tac-Toe. The game follows a turn-based approach where

Matrix Cells in Distance Order Solution In C++/Python/java/JS

Problem Description Given a rows x cols matrix, we are provided with a starting position (rCenter, cCenter). The task is to return the coordinates of all cells in the matrix, sorted by their Manhattan distance from the center. The Manhattan distance between two points (r1, c1) and (r2, c2) is