题解 | 牛牛的快递

#include <stdio.h>

int main() {
    float a;
    char b;
    int cost;
    scanf("%f %c",&a,&b);
    if(a<=1){
        cost = 20;
    }
    else{
	  // 判断是否需要向上取整
        if((int)(a)<a){
            cost = 20+(int)(a);
        }
        else{
            cost = 19+(int)(a);
        }
    }

    if(b == 'y'){
        cost += 5;
        printf("%d\n",cost);
    }
    else{
        printf("%d\n",cost);
    }

    return 0;
}