题解 点赞

#include<bits/stdc++.h>
using namespace std;
string c="0123456789X",s;
int cnt=1,sum;
int main(){
    cin>>s;
    for(int i=0;i<=s.size()-3;i++){
        if(s[i]!='-'){
            sum+=(s[i]-'0')*cnt;
            cnt++;
        }
    }
    if(c[sum%11]==s[s.size()-1]){
        cout<<"Right"<<"\n";
    }else{
        s[s.size()-1]=c[sum%11];
        cout<<s<<"\n";
    }
    return 0;
}