#include
using namespace std;
void dfs(vector& array,vector& visit,int cum,int& res){
if(cum>99&&cum<=999){
cout< array{1,2,3,4};
int res = 0;
int n = array.size();
vector 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");
}