title: add elements of array thats sum equals the largest element
body: <p>what is a way to add elements of array thats sum would equal the largest element in the array? </p>
  
  <p>example for this array  [4, 6, 23, 10, 1, 3] I have sorted the array first resulting in [1, 3, 4, 6, 10, 23] then I pop the last digit or the last element max = 23. I'm left with [1, 3, 4, 6, 10] and need a way to find a way to find the elements that add up to 23 which are 3 + 4 + 6 + 10 = 23. The elements don't have to be subsequent they can be at random points of the array but they must add up to max. </p>
  
  <p>I can find the permutations of the sorted array from 2 elements to n-1 elements and sum them and compare them to max but that seems inefficient. plz help</p>