CCF认证真题-(201312-2)-ISBN号码(模拟)

#include <iostream>
#include <algorithm>
using namespace std;

int arr[10005];
int toNum(char ch) {return ch - ‘0‘;}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    @R_801_10495@ng s;
    cin >> s;
    int num = toNum(s[0]) + toNum(s[2]) * 2 + toNum(s[3]) * 3 + toNum(s[4]) * 4 +toNum(s[6]) * 5 + toNum(s[7]) * 6;
    num += toNum(s[8]) * 7 + toNum(s[9]) * 8 + toNum(s[10]) * 9;
    if ((s[12] == ‘X‘ && num % 11 == 10) || (num % 11 == toNum(s[12])))
        cout << "Right" << endl;
    else {
        if (num % 11 == 10)
            s[12] = ‘X‘;
        else
            s[12] = ‘0‘ + num % 11;
        cout << s << endl;
    }
    return 0;
}