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#include <algorithm>
#include <iostream>
using namespace std;
int main()
{
int one[] = { 1, -2, 3, -4, 5, -6, 7, -8, 9};
int two[] = { -8, -2, -4, -6, 3, 1, 5, 9, 7};
int three[] = { -8, -8, -4, -6, 3, 1, 5, 9, 7};
cout << "one is a permutation of two: " <<
is_permutation(one, end(one), two) << "\n"
"one is a permutation of three: " <<
is_permutation(one, end(one), three, end(three)) << '\n';
}
// Displays: one is a permutation of two: 1
// one is a permutation of three: 0
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