C++全排列函数

#include<algorithm>
#include<iostream>
using namespace std;
#include<algorithm>
int main()
{
	int a[3]={1,2,3};
	do
	{
		int i;
		for(i=0;i<3;i++)
		{
			cout<<a[i];
		}
		cout<<endl;
	}while(next_permutation(a,a+3));
	return 0;
}