题解 100% AC

#include <bits/stdc++.h>
using namespace std;
int main(){
    int a[]={7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
    char m[] = "10X98765432";
    string c;
	cin>>c;
    if(c.length()!=18){
        cout<<"No"<<endl;
        return 0;
    }
	int sum=0;
    for(int i=0;i<17;i++){
        int x=c[i]-'0';
        sum+=a[i]*x;
    }
    int z=sum%11;
    if (c[17]==m[z]) {
        cout<<"Yes"<<endl;
        return 0;
    } else {
        cout<<"No"<<endl;
        return 0;
    }
}