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DSA

25 posts

Last Updated: 17 July 2026

Given an array arr[] of n unique numeric strings, all of the same length, find all possible arrangements of these strings that form a number square. Strings from the list ...read more

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Algorithms-Backtracking

Last Updated: 16 July 2026

Given an array arr[] of strings containing lowercase English letters. For each string, if it has already appeared earlier in the array, append a suffix equal to the number...read more

Visitors Without Pass

Last Updated: 15 July 2026

There are n visitors standing in a queue. Each visitor prefers either pass type 0 or pass type 1. There are n passes placed in a stack, where passes[0] represents the pass...read more

First Greater Element

Last Updated: 15 July 2026

Given an array arr[] of integers, for each element arr[i], find the smallest element arr[j] such that j i and arr[j] arr[i]. If no such element exists, return -1 for tha...read more

Distinct Characters In Sorted Manner

Last Updated: 14 July 2026

Given a string s, return a string containing all distinct characters from s in non-decreasing order, without using any sorting algorithm.Examples:Input: s = "abdbc"Output:...read more

Last Updated: 10 July 2026

Given a string s consisting of lowercase English letters. Each letter corresponds to a number on a standard keypad, as shown in the figure. Replace every character in s wi...read more

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Maximize Contest Score

Last Updated: 29 June 2026

Geekland is conducting a programming contest that lasts for n minutes.The contest contains en number of easy problems and hn number of hard problems.Geek will be awarded e...read more

Wine Buying and Selling

Last Updated: 01 July 2026

Given an integer array arr[] representing houses built along a straight line, each value arr[i] represents a certain number of wine bottles that a wants to buy or sell.If ...read more

two-pointer-algorithm

Count Subsequence Occurrences with Different Characters

Last Updated: 22 May 2026

Given two strings s and w, find the number of times w appears as a subsequence of string s where every character of string s can be included in forming at most one subsequ...read more

Bitwise OR with Next Element

Last Updated: 07 May 2026

Given an array arr[], modify the array in-place such that each element becomes the bitwise OR of itself and its next element. The last element remains unchanged as it has ...read more

Computing Point Counts from a Set of Intervals

Last Updated: 10 March 2026

Given n points on a line numbered from 1 to n, and a list of intervals, where each interval [l, r, count] adds count to every point from l to r (inclusive). Compute the to...read more

Count Subarrays with K Equal Value Pairs

Last Updated: 14 March 2026

Given an arrays arr[] integer and a positive integer k , find the number of subarray which contains atleast k pairs with equal value. The pair is defined as two indices (i...read more

Short Notes on Matrix (2-D Arrays)

Last Updated: 21 February 2026

A matrix is a rectangular arrangement of elements in rows and columns. In programming, it is implemented as a 2-D array, where each element is accessed using two indices [...read more

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Short Notes on Deque

Last Updated: 21 February 2026

Deque : A linear data structure that allows insertion and deletion from both ends (front and rear). It is also called a Double Ended Queue.Unlike Queue (FIFO), Deque provi...read more

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Number of possible squares

Last Updated: 11 December 2025

Given an N × N chessboard. Find the total number of distinct squares that can be formed on this board.Note: A square can be of any size: 1×1, 2×2, 3×3, …, up to N×N.Exampl...read more

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