#include <algorithm>
#include <cassert>
#include <iostream>
#include <iterator>
#include <vector>
int main()
{
//v contains all values from zero to ten
std::vector<int> v;
v.push_back(0);
v.push_back(1);
v.push_back(2);
v.push_back(3);
v.push_back(4);
v.push_back(5);
v.push_back(6);
v.push_back(7);
v.push_back(8);
v.push_back(9);
//w contains all squares from 1 to an including 25
std::vector<int> w;
w.push_back( 1);
w.push_back( 4);
w.push_back( 9);
w.push_back(16);
w.push_back(25);
//x is the difference of v and w:
//that is, the elements in v, that are
//not in w
std::vector<int> x;
std::set_difference(v.begin(),v.end(),w.begin(),w.end(),
std::back_inserter(x));
//so x contains all three squares between zero to ten
assert(x.size() == 7);
assert(x[0] == 0);
assert(x[1] == 2);
assert(x[2] == 3);
assert(x[3] == 5);
assert(x[4] == 6);
assert(x[5] == 7);
assert(x[6] == 8);
//Show x on screen
std::copy(x.begin(),x.end(),std::ostream_iterator<int>(std::cout," "));
std::cout << '\n';
}
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