题解 | #网购#

#include <stdio.h>
int main() 
{
    double price = 0.0;
    int month = 0;
    int day = 0;
    int flag = 0;
    double cut = 1.0;
    double last = 0.0;
    scanf("%lf %d %d %d",&price,&month,&day,&flag);
    if(month == 11 && day == 11)
    {
        cut = 0.7;
        if(flag==1)
        {
            last = price*cut-50;
        }
        else 
        {
            last = price*cut;
        }
    }
    else if(month == 12 && day == 12)
    {
        cut = 0.8;
        if(flag==1)
        {
            last = price*cut-50;
        }
        else 
        {
            last = price*cut;
        }
    }
    if(last<0.0)
    {
        printf("%.2lf\n",0.0);
    }
    else 
    {
        printf("%.2lf\n",last);
    }

    return 0;
}