孩子们我回来了

#include<bits/stdc++.h>
using namespace std;
int main(){
int a;
cin>>a;
stack<int> b;
while(a){

    b.push(a%2);
    a/=2;
}
while(b.size()){
    cout<<b.top();
    b.pop();
}

return 0;

}