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Probability of Survival

Last Updated: 16 June 2026

Given an n×n grid and three integers x, y, and k, a geek starts at cell [x, y]. At each move, the geek independently chooses one of the four directions - up, down, left, o...read more

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DSA

Maximum Reachable Index Difference

Last Updated: 14 June 2026

Given a string s containing lowercase English letters. Start from any index containing the character 'a' and perform jump operations. In each jump operation, move to any i...read more

DSA

Build Bit Count Array

Last Updated: 13 June 2026

Given an integer n, return an array containing the number of set bits (1s) in the binary representation of every integer in the range [0, n].Examples :Input: n = 3Output: ...read more

DSA

Exact n Rupees After 0 or More Buyings

Last Updated: 13 June 2026

Given an integer n, find whether Geek can have exactly n rupees after buying chocolates from a shop. Geek initially has 100 rupeesThe shop sells only two types of chocolat...read more

DSA

Connected Groups of 1s

Last Updated: 13 June 2026

Given an n × m binary grid, count the number of connected groups formed by cells containing 1. Two cells belong to the same group if they are adjacent horizontally or vert...read more

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DSA

Minimum Swaps to Make Arrays Equal

Last Updated: 14 June 2026

Given two arrays a[] and b[] of the same size n, in one swap you can swap a[i] with b[i]. Find the minimum number of swaps required to make all elements of a[] equal or al...read more

DSA

Front-Back Transformation of String

Last Updated: 13 June 2026

Given a string s consisting only of English alphabets, transform each character by replacing it with the character present at the corresponding position in the reversed En...read more

DSA

Lexicographically Smallest and Largest

Last Updated: 13 June 2026

Given an array of strings s[]. You need to find the lexicographically smallest and largest.Examples: Input: s[] = [a , ab , abc]Output: [a, abc]Explanation: Lexicographica...read more

DSA

Distinct Elements in a Stream

Last Updated: 14 June 2026

Given an array of integers arr[], the task is to return the no of distinct elements in every prefix. The array will have positive and negative values. positive value means...read more

DSA

Waiting Time of the Last Consumer

Last Updated: 07 June 2026

Given two positive integers n and x, n denotes the total number of consumers, x denotes the time interval, after which a new consumer arrives. A single producer serves on...read more

DSA

Number of Open Tabs

Last Updated: 08 June 2026

You are given an array arr[], where each element is either a tab ID or the string "END". If a tab ID appears, toggle its state (open if it's closed, or close if it's open)...read more

DSA

Remove first and last characters

Last Updated: 07 June 2026

Given a string s, return a substring containing all characters except the first and the last. The length of the s will be greater than 2.Examples:Input: s = "Hello"Output:...read more

DSA

The Modulo Task

Last Updated: 07 June 2026

Given an integer n. find an integer k for which n % k is the largest where 1 ≤ k n.Examples :Input: n = 3Output: 2Explanation:3 % 1 = 03 % 2 = 1So, the modulo is highest ...read more

DSA

Numbers from 1 to n with digits in set {1, 2, 3, 4, 5}

Last Updated: 04 June 2026

Given a number n, count the numbers from 1 to n, which comprise only digits from set {1, 2, 3, 4, 5}.Examples:Input: n = 20Output: 10Explanation: The numbers whose digits ...read more

DSA

Bitwise OR of a Binary Array

Last Updated: 04 June 2026

Given a binary array, find Bitwise OR of the given array. Examples : Input: arr[] = [1 1 1 0]Output:1Explanation:1 | 1 = 11 | 1 = 11 | 0 = 1hence output is 1Input: arr[]...read more

DSA

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