reverse权威

reverse还是太权威了

#include <bits/stdc++.h>
using namespace std;
string s;
int main() {
    int n;
    cin >> n;
    while (n>0) {
        s+=char(n%2+'0');
        n /= 2;
    }
    reverse(s.begin(),s.end());
    cout<<s;
    return 0;
}