#include<bits/stdc++.h>

using namespace std;

void dfs(vector<int>& array,vector<bool>& visit,int cum,int& res){

if(cum>99&&cum<=999){

cout<<cum<<endl;

return;

}

for(int i=0;i<array.size();i++){

if(visit[i]){

continue;

}

visit[i] = true;

int tem = cum*10+array[i];

dfs(array,visit,tem,res);

visit[i] = false;

}

}

void code2(){

vector<int> array{1,2,3,4};

int res = 0;

int n = array.size();

vector<bool> visit(n,false);

for(int i=0;i<4;i++){

if(visit[i]){

continue;

}

visit[i] = true;

int cum = array[i];

dfs(array,visit,cum,res);

visit[i] = false;

}

}

int main(){

code2();

system("pause");

}