There are n nuts and n bolts represented in two different arrays and a function is_fit(nut_i, bolt_j) which returns 0 if its perfectly fit, 1 if it’s a tight fit and -1 if its loose fit. I was asked to arrange them so that every nut fits perfectly with the bolt in the same position (there is one nut for every bolt that fits perfectly). I suggested O(nlogn) solution