n个数的全排列

#define _CRT_SECURE_NO_DEPRECATE
#include<iostream>
#include<string>
#include<algorithm>
#define MAX 1100
using namespace std;

int perm1[MAX], perm2[MAX];
bool used[MAX];
void _permutation(int pos, int n){
    if (pos == n){
        for (int i = 0; i < n; i++)
            cout << perm2[i] << ",";
        cout << endl;
        return;
    }
    for (int i = 0; i < n; i++){
        if (!used[i]){
            perm2[pos] = perm1[i];
            used[i] = 1;
            _permutation(pos + 1, n);
            used[i] = 0;
        }
    }
}
int main()
{
    int n = 4;
    for (int i = 0; i < n; i++)
        perm1[i] = i;
    memset(used, 0, sizeof(used));
    _permutation(0, n);
    system("pause");
    return 0;
}