题解

#include<bits/stdc++.h>
using namespace std;
int main(){
    string str;
    cin>>str;
    int shibie=(1*(str[0]-'0')+2*(str[2]-'0')+3*(str[3]-'0')+4*(str[4]-'0')+5*(str[6]-'0')+6*(str[7]-'0')+7*(str[8]-'0')+8*(str[9]-'0')+9*(str[10]-'0'))%11;
    if(str[12]=='X'&&shibie==10)cout<<"Right";
    else if((str[12]-'0')==shibie)cout<<"Right";
    else{
        cout<<str[0]<<str[1]<<str[2]<<str[3]<<str[4]<<str[5]<<str[6]<<str[7]<<str[8]<<str[9]<<str[10]<<str[11];
        if(shibie==10)cout<<"X";
        else cout<<shibie;
    }
    return 0;
}

AC