#include <iostream>
#include <algorithm>
#include <iterator>
using namespace std;
int main()
{
int a[] = { 1,2,3,4,5 };
int b[] = { 3,5,6,7,9 };
set_difference(begin(b), end(b), begin(a), end(a), ostream_iterator<int>(cout, " "));
}
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