五十分弱鸡求救！！！！！！！dalao救救！！！！！

我的代码 样例是对的，但是为什么才五十分？

#include <iostream>
#include <sstream>

using namespace std;

int g[700];
int main() {
    int a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, ans;
    string b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ans11;
    long long an1 = 0;
    string a;
    string b;
    for (int i = 0; i < 13; i++) {
        cin >> a[i];
    }
    b0 = a[0];
    stringstream geek1(b0);
    geek1 >> a0;

    b1 = a[2];
    stringstream geek2(b1);
    geek2 >> a1;

    b2 = a[3];
    stringstream geek3(b2);
    geek3 >> a2;

    b3 = a[4];
    stringstream geek4(b3);
    geek4 >> a3;

    b4 = a[6];
    stringstream geek5(b4);
    geek5 >> a4;

    b5 = a[7];
    stringstream geek6(b5);
    geek6 >> a5;

    b6 = a[8];
    stringstream geek7(b6);
    geek7 >> a6;

    b7 = a[9];
    stringstream geek8(b7);
    geek8 >> a7;

    b8 = a[10];
    stringstream geek9(b8);
    geek9 >> a8;

    b9 = a[12];
    stringstream geek10(b9);
    geek10 >> a9;

    an1 = a0 * 1 + a1 * 2 + a2 * 3 + a3 * 4 + a4 * 5 + a5 * 6 + a6 * 7 + a7 * 8 + a8 * 9;
    an1 %= 11;
    if(a9 == an1){
        cout <<"Right";
        return 0;
    }
    else{
        for(int i = 0; i < 12; i++){
            cout << a[i];
        }
        cout << an1;
    }
    return 0;
}