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DSA / Data Structures / Hash

Hash

1.3K+ posts

Commonly Asked Data Structure Interview Questions on Hashing

Last Updated: 19 May 2025

Hashing is a technique to map data to fixed-size values using a hash function, often used for quick lookups, insertions, and deletions in applications like databases and c...read more

Meeting rooms - Find minimum meeting rooms

Last Updated: 26 March 2025

Given two arrays start[] and end[] such that start[i] is the starting time of ith meeting and end[i] is the ending time of ith meeting. Task is to find minimum number of r...read more

Find a word with highest number of repeating characters

Last Updated: 08 January 2025

Given a string which contains multiple words, our task is to find the word which has highest number of repeating characters.Examples:Input: str = "hello world programming"...read more

3 Sum - Count all triplets with given sum

Last Updated: 28 December 2024

Given an arrayarr[]and a target value, the task is to find the count of triplets present in the given array having sum equal to the given target.Examples:Input: arr[] = [0...read more

2 Sum - Find All Pairs With Zero Sum

Last Updated: 13 October 2024

Given an arrayarr[], the task is to find all possible indices (i, j) of pairs(arr[i], arr[j])whose sum is equal to 0 and i != j. We can return pairs inany order, but all t...read more

2 Sum - Find All Pairs With Given Sum

Last Updated: 11 October 2024

Given an arrayarr[]and a target value, the task is to find all possible indices (i, j) of pairs (arr[i], arr[j])whose sum is equal to target and i != j. We can return pair...read more

Intersection of Two Arrays with Distinct Elements

Last Updated: 04 October 2024

Given two arraysa[]andb[] with distinct elements of sizenandm respectively, the task is to find intersection (or common elements) of the two arrays. We can return the answ...read more

union-intersection

Union of Two Sorted Arrays

Last Updated: 04 October 2024

Given two sorted arrays a[] and b[], the task is to to returnunionof both the arrays insorted order. Union of two arrays is an array having alldistinctelements that are pr...read more

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union-intersection

Union of Two Sorted Arrays with Distinct Elements

Last Updated: 03 October 2024

Given two sorted arrays a[] and b[] with distinct elements, the task is to returnunionof both the arrays in sorted order.Note:Union of two arrays is an array having alldis...read more

article_image

union-intersection

2 Sum - Find a pair with given sum

Last Updated: 01 October 2024

Given an array of integers arr[] and an integer target, print a pair of two numbers such that they add up to target. You cannot use the same element twice.Examples:Input: ...read more

Union of Two Arrays with Distinct Elements

Last Updated: 04 October 2024

Given two arrays a[] and b[] with distinct elements, the task is to return union of both the arrays in any order. Note: Union of two arrays is an array having all distinct...read more

union-intersection

Union of Two Arrays

Last Updated: 04 October 2024

Given two arraysa[]andb[], the task is to returnunionof both the arrays inany order.Note:Union of two arrays is an array having alldistinctelements that are present in eit...read more

union-intersection

Common Elements in Two Arrays

Last Updated: 17 October 2024

Given two arrays, the task is find common elements of the two arrays. The input arrays may contain duplicates and our job is to find all common elements We are allowed to ...read more

union-intersection

Intersection of two Arrays

Last Updated: 04 October 2024

Given two arrays a[] and b[], the task is find intersection of the two arrays. Intersectionof two arrays is said to be elements that arecommonin both arrays. The intersect...read more

union-intersection

Find Subdomain Visit Count

Last Updated: 14 June 2024

A website domain "write.geeksforgeeks.org" consists of various subdomains. At the top level, we have "org", at the next level, we have "geeksforgeeks.org" and at the lowes...read more

Interview-Questions

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