순열 STL사용

#include <iostream>
#include <algorithm>
using namespace std;
 
int main()
{    
    int a[] = { 1,2,3,4 };
    do {
        for (int i = 0; i < 4; i++) {
            printf("%d ", a[i]);
        }printf("\n");
    } while (next_permutation(a, a + 4));
    
    return 0;
}