With STL a simpler solution is possible:
#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
        int a[] = {1, 2, 3, 4, 5};
        do
        {
                for (int i = 0; i < 5; ++i)
                        cout << a[i] << " ";
                cout << endl;
        }while(next_permutation(a, a + 5));
        return 0;
}

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