全排列函数（next_permutation)

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int main()
{
int a[10];
int n;
scanf("%d",&n);
for(int i = 1; i <= n ; i++)
scanf("%d",&a[i]);
sort(a+1,a+n+1);
do{
for(int i = 1; i < n ;i++)
printf("%d ", a[i]);
printf("%d\n", a
);
}
while(next_permutation(a+1,a+n+1));
return 0;
}