题解 | #牛牛的短信#

#include <stdio.h>
void  judge(int m,double* cost)
{
    if(m<=60)
     {
        *cost+=0.1;
     }
     else
     {
        *cost+=0.2;
     }
}
int main() 
{
    int n;
    double cost=0;
    scanf("%d",&n);
    while(n)
    {
        int m;
        scanf("%d",&m);
        judge(m,&cost);
        n--;
    }
    printf("%lf",cost);
    return 0;
}