DSA

20.2K+ posts

Last Updated: 29 March 2025

Given a Dequedcontaining non-negative integers.Complete below functionsdepending type of query as mentioned andprovided to you (indexing starts from 0):1.eraseAt(x):this f...read more

DSA

deque

Maximum XOR Queries With an Element From Array

Last Updated: 18 April 2025

Given an array arr[] of size n containing non-negative integers and also given a list of q queries in a 2D array queries[][], where each query is of the form [xi, mi]. For...read more

Bit Magic

DSA

Group Balls by Sequence

Last Updated: 19 June 2025

Given an integer array arr[], where each element represents the number written on a ball, and an integer k, determine whether it's possible to rearrange all the balls into...read more

Sorting

DSA

Unique Vowel Arrangements

Last Updated: 14 July 2025

Given a lowercase string s, find the total number of distinct strings that can be formed by the following process:Identify all distinct vowels (a, e, i, o, u) in s.For eac...read more

DSA

Must‑Have Digit

Last Updated: 14 July 2025

Given an integernrepresenting the number of digits, and an arrayarr[] of digits (0–9), count how many n‑digit positive integers can be formed such that at least one digit ...read more

DSA

Floor and Ceil of Integer Division

Last Updated: 14 July 2025

Given two integers a and b (where b ≠ 0). The objective is to find:• The floor of the division a / b, denoted as ⌊a / b⌋ — the greatest integer less than or equal to a / b...read more

DSA

Maths

Candidates with majority vote

Last Updated: 25 June 2025

Given an array arr[] of positive integers representing votes for candidates, return all candidates who receive more than ⌊n/3⌋ votes.Return the result in increasing order ...read more

DSA

Counting Even-Frequency Characters in a String

Last Updated: 07 July 2025

Given a lowercase string s, count how many distinct characters appear an even number of times.Examples: Input: s = "abacaba"Output: 2Explanation: The frequency of a is 4, ...read more

DSA

Sequence Breaks

Last Updated: 11 July 2025

Given an integer array arr[] representing a sequence of elevations, Return an array that includes:The first and last elements of the array.Every element where the trend of...read more

DSA

ASCII Range Sum

Last Updated: 08 July 2025

Given a string s consisting of lowercase English letters, identify all characters whose first and last occurrences are at different positions.For each such character, comp...read more

Last Updated: 05 July 2025

You are given a 2D integer array intervals[][] of length n and integer k, where each intervals[i] = [start, end] represents a closed interval (i.e., all integers from star...read more

DSA

prefix-sum

DSA

Balance Consonant and Vowels Ratio

Last Updated: 11 July 2025

You are given an array of strings arr[], where each string contains only lowercase English letters. Count the number of contiguous subarrays (i.e., one or more consecutive...read more

DSA

Tywin's War Strategy

Last Updated: 18 July 2025

Given an array arr[] of length n, where arr[i] is the number of soldiers in the i-th troop, and an integer k. A troop is called lucky if its soldier count is a multiple of...read more

DSA

Maximum Non-Overlapping Odd Palindrome Sum

Last Updated: 18 July 2025

Given a string s consisting of lowercase English letters, find the maximum possible sum of the lengths of any two non-empty and non-overlapping palindromic substrings of o...read more

DSA

strings

Count Frequency of an Element in a Given Range

Last Updated: 16 July 2025

Given an array arr[] of integers and a 2D array queries[][], where each queries[i] contains three integers: l, r, and x. For each query, determine how many times the eleme...read more

DSA

Binary Search

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