#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
int n,r;
string s;
int main()
{
    cin>>n;
    while(n!=0)
    {
        int x=n%r;
        if(x<10) s+=char(x+'0');
        else s+=char(x-'A'+10);
        n/=r;
    }
    reverse(s.begin(),s.end());
    cout<<s;
}

RE是什么错误？？？？？

点我查看