太野了！

#include<iostream>
using namespace std;
int main(){
    int n,a[10]{0,0,0,0,0,0,0,0,0,0},aa=0,s=0;
    cin>>n;
    while(n){
        a[aa]=n%2;
        n/=2;
        aa++;
    }
    for(int i=9;i>=0;i--){
        if(a[i]==0&&s==0)continue;
        s=1;
        cout<<a[i];
    }
    return 0;
}