// CPP program to illustrate// std::set_difference#include<bits/stdc++.h>intmain(){intfirst[] = {5,10,15,20,25};intsecond[] = {50,40,30,20,10};intn =sizeof(first) /sizeof(first[0]);std::vector<int> v2(5);std::vector<int>::iterator it, ls;std::sort(first, first +5...