#include <bits/stdc++.h> using namespace std; int n; int v[10]; void dfs(int step,string s){ if(step>n){ cout<<s<<endl; return; } for(int i=1;i<=n;i++) { if(v[i]==0){ v[i]=1; dfs(step+1,s+char(i+'0')); v[i]=0; } } } int main(){ cin>>n; dfs(1,""); return 0; } /************************************************************** Problem: 1308 User: linzihao Language: C++ Result: Wrong Answer ****************************************************************/