4sum -Complete Tutorial

The 4Sum problem is an extension of the well-known 2-Sum and 3-Sum problems, where the goal is to find four numbers in an array that sum up to a given target. It’s a common problem in algorithmic challenges and is used to test understanding of array manipulation, sorting, and optimization techniques.

The following are practice problems based on 4Sum.

• Check for Quadruple
• Find any quadruplet having given sum
• Count Quadruples with Given sum
• All Quadruples with Given Sum
• All Distinct Quadruples with Given Sum
• Quadruplet Sum Closest to Target
• Count quadruples of given type
• Count quadruples from four sorted arrays
• Count of quadruplets with given Sum from 4 Arrays
• Maximum product quadruple
• Count Quadruples with Pair wise same Square Sum
• Count all Quadruples from four arrays with given XOR
• Quadruples for Sum and Product of Integers with XOR
• Number of Maximum Product Quadruples