题解 | #网购#

int main()
{
    float val;
    int month,day,p;
    scanf("%f %d %d %d",&val,&month,&day,&p);
    if(month==11&&day==11&&p==0) val=val*0.7;
    else if(month==11&&month==11&&p==1) val=val*0.7-50;
    else if(month==12&&day==12&&p==0) val=val*0.8;
    else if(month==12&&day==12&&p==1) val=val*0.8-50;
    if(val>=0) printf("%.2f",val);
    else printf("0.00");
    return 0;
}