题解 | #记负均正#

#include<stdio.h>

int main() { int n = 0;

while (scanf("%d", &n) != EOF)
{
	int cnt = 0;//记录负数的个数
	int ret = 0;//记录正数的个数
	double sum = 0.0;//存放正数和
	int tmp = 0;
	int i = 0;

	for (i = 0; i < n; i++)
	{
		scanf("%d", &tmp);
		if (tmp < 0)
		{
			cnt++;
		}
		else if(tmp > 0)
		{
			sum += tmp;
			ret++;
		}
	}

	if (ret == 0)
	{
		printf("%d 0.0\n", cnt);
	}
	else
	{
		printf("%d %.1lf\n", cnt, sum / ret);
	}
}

return 0;

}