题解 | #牛牛的快递#

#include<stdio.h>
#include<math.h>
int main()
{
	float kg = 0;  
	char  a = 0;  
	int price = 0;  
	scanf("%f %c", &kg, &a);  
	if (kg <= 1)
	{
		price = 20;  
	}
	else
	{
		price = 20 + ceil((float)kg - 1);  
	}
	if (a == 'y') 
	{
		price =price + 5; 
	}
	printf("%d", price); 
	return 0; 
}