a020: 身分證檢驗 FYI: https://yunlinsong.blogspot.com/2016/02/blog-post_5.html

a020.cpp

#include <iostream>

using namespace std;

int main()
{
    short encode[] = {
        10, 11, 12, 13, 14, 15, 16, 17, 34,
        18, 19, 20, 21, 22, 35, 23, 24, 25,
        26, 27, 28, 29, 32, 30, 31, 33
    };

    const short SIZE = 8;
    char a;
    int n;

    while( cin >> a >> n)
    {
        int temp = encode[a - 'A'];
        int check = (temp % 10) * 9 + temp / 10;

        check += (n % 10);
        n = n / 10;

        for(int i = 1; i <= SIZE; i++)
        {
            check += (n % 10) * i;
            n = n / 10;
        }

        if( check % 10 == 0 )
            cout << "real";
        else
            cout << "fake";

        cout << endl;
    }

    return 0;
}