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2Sum

8 posts

4 Sum - Count quadruplets with given sum in an array

Last Updated: 23 July 2025

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

interview-preparation

cpp-unordered_map

Find all pairs with a given sum in two unsorted arrays

Last Updated: 23 July 2025

Given two unsorted arrays of distinct elements, the task is to find all pairs from both arrays whose sum is equal to a given value X.Examples:Input: arr1[] = {-1, -2, 4, -...read more

2 Sum - Count pairs with given sum

Last Updated: 06 August 2025

Given an array arr[] of n integers and a target value, find the number of pairs of integers in the array whose sum is equal to target.Examples:Input: arr[] = [1, 5, 7, -1,...read more

2 Sum - Pair Sum Closest to Target using Binary Search

Last Updated: 23 July 2025

Given an array arr[] of n integers and an integer target, the task is to find a pair in arr[] such that it’s sum is closest to target.Note:Return the pair in sorted order ...read more

two-pointer-algorithm

Count pairs with absolute difference equal to k

Last Updated: 23 July 2025

Given an array arr[] and a positive integer k, the task is to count all pairs (i, j) such that i j and absolute value of (arr[i] - arr[j]) is equal to k.Examples:Input: a...read more

4 Sum - All Distinct Quadruplets with given Sum in an Array

Last Updated: 13 August 2025

Given an array arr[], and an integer target, find all possible unique quadruplets in an array whose sum is equal to the given target value. We can return quadruplets in an...read more

two-pointer-algorithm

Pair Sum Closest to 0

Last Updated: 19 April 2026

Given an integer array arr[], find the sum of any two elements whose sum is closest to zero. Note: In case if we have two ways to form sum closest to zero, return the maxi...read more

article_image

two-pointer-algorithm

Two Sum - Pair with given Sum

Last Updated: 26 July 2025

Given an array arr[] of n integers and a target value, check if there exists a pair whose sum equals the target. This is a variation of the 2-Sum problem.Examples:Input: a...read more

article_image

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