A140

内部函数next_permutation() 嘻嘻

#include <bits/stdc++.h>
using namespace std;
vector<int> ve;
int n;
int main(){
    cin >> n;
    for(int i = 1;i <= n;i++){
        ve.push_back(i);
    }
    for(int i = 0;i < n;i++) cout << ve[i] << " ";
    cout << endl;
	while(next_permutation(ve.begin(),ve.end())){
		for(int i = 0;i < n;i++) cout << ve[i] << " ";
        cout << endl;
	}
}