How to find all unique quadruples close to zero using C#?

The simplest way is that we can create four nested loops and check one by one whether the sum of all four elements is zero. If the sum of the four elements is zero, print the elements.

Time complexity - O(n⁴)

- O(1)

We can use an unordered set data structure to store each value of the array. Set offers the advantage of searching for elements in O(1) time. So, for each pair in the array, we will look for the negative value of their sum that may exist in the set. If such an element is found then we can print a triple which will be a pair of integers and the negative value of their sum.

Time complexity - O(n ³)

Space complexity - O(n)

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