题解 | #网购#

#include <stdio.h>
int main()
{
    double val=0.0;
    int month,day,j;
    scanf("%lf %d %d %d",&val,&month,&day,&j);
    double sum=0;
    if(j==1&&month==11&&day==11)
    {
       sum=(val*0.7)-50;
    }
    if(j==0&month==11&&day==11)
    {
        sum=val*0.7;
    }
    if(j==1&&month==12&&day==12)
    {
        sum=(val*0.8)-50;
    } 
    if(j==0&&month==12&&day==12)
    {
    sum=val*0.8;
    }
    if(sum<0)
    {
        sum=0;
    }
    printf("%.2lf",sum);
    return 0;
}