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很少的代码#include<iostream>
#include<string>
using namespace std;
int main(){
string str;
cin>>str;
while(str!="0"){
int i = str.size();
int j(0);
for(int k=0;k<i;k++){
j = (j*10 + (str[k]-'0'))%9;
}
if(j==0){
j+=9;
}
cout<<j<<endl;
l: cin>>str;
}
return 0;
}
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