Question

Given an array a of size n, find all combination of four elements in the array whose sum is equal to a given value k. For example, if the given array is {10, 2, 3, 4, 5, 9, 7, 8} and k = 23, one of the quadruple is 3 5 7 8 (3 + 5 + 7 + 8 = 23).

Answer 1

$a = - 2$

$b = 1.3$

$c = - 1$

$x = - 3$

$y = - 5$

$z = 2$