题解 | #网购#

#include <stdio.h>

int main() {
    float jg;
    int mouth,days,yh;
    scanf("%f %d %d %d",&jg,&mouth,&days,&yh);
    if(mouth==11&&days==11){
        if(yh==1){
           if((jg*0.7-50)<0){
             printf("0.00");
           }
           else{
             printf("%.2f",jg*0.7-50);
           }
        }
        else{
            printf("%.2f",jg*0.7);
        }
    }
    else if(mouth==12&&days==12){
        if(yh==1){
            float i=jg*0.8-50;
            printf("%.2f",i);
        }
        else{
            printf("%.2f",jg*0.8);
        }
    }
    return 0;
}