满江红，多了一个甩都甩不去的s

#include<bits/stdc++.h>
using namespace std;
int sum=0;
string s;
string ten_to_x(string s){
	int t=1;
	int n=s.size()-1;
	for(int i=n;i>=0;i--){
		if(s[i]>='0'&&s[i]<='9'){
			int d=s[i]-'0';
			sum+=d*t;
		}
		else{
			int d=s[i]-'A'+10;
			sum+=d*t;
		}
		t*=8;
	}
    while(sum/2){
        int d1=sum%16;
        char c1;
        if(d1<=9)c1=d1+'0';
        else c1=d1-10+'A';
        s=c1+s;
        sum/=16;
    }
    return s;
}
int main(){
	cin>>s;
	cout<<ten_to_x(s);
	return 0;
}