『洛谷 P1706』全排列

辣鸡题目。直接STL水掉，84ms AC

#include <iostream>
#include <algorithm>
using namespace std;
int a[10], N;
int main(int argc, char **argv)
{
	ios::sync_with_stdio(false);
	cin >> N;
	for (register int i = 1; i <= N; ++i) a[i] = i, cout << "    " << i;
	cout << endl;
	while (next_permutation(a + 1, a + N + 1))
	{
		for (register int i = 1; i <= N; ++i)
			cout << "    " << a[i];
		cout << endl;
	}
	return 0;
}