样例全过，但全红

#include<algorithm>
#include<iostream>
#include<iomanip>
using namespace std;
int main(){
    int n,a[100005];
    cin>>n;
    for(int i=1;i<=n;i++){
        a[i]=i;
    }
    do{
        for(int i=1;i<=n;i++)
            cout<<setw(4)<<a[i]<<" ";
        cout<<"\n";
    }while(next_permutation(a+1,a+n+1));
    return 0;
}