题解 | #[NOIP2008]ISBN号码#

int main()
{
    char chs[13] = "";
    int i = 0;
    scanf("%s", chs);
    int remainder = 0;
    int ret = 0; //求和
    int j = 0; //之前用的i,但是会因为continue跳过1和5
    for(i = 0, j = 1; i < 11; i++)
    {
        if(i == 1 || i == 5)
        {
            continue;
        }
        else
        {
            ret += ((chs[i] - '0') * (j++));
        }
    }
    remainder = ret % 11; //remainder,余数
    if(remainder == 10)
    {
        if(chs[12] == 'X')
        {
            printf("Right");
        }
        else
        {
            chs[12] = 'X';
            printf("%s",chs);
        }
    }
    else
    {
        if(remainder == chs[12] - '0')
        {
            printf("Right");
        }
        else
        {
            chs[12] = remainder + '0';
            printf("%s",chs);
        }
    }
    return 0;
}