题解 | #记负均正#

#include <stdio.h>

int main()
{
	int n;
	scanf("%d\n", &n);
	float sum = 0;
	float ave = 0;
	int i;
	int arr[2000] = { 0 };
	for ( i = 0; i < n; i++)
	{
		scanf("%d", &arr[i]);
	}
	int count = 0;
	for ( i = 0; i < n; i++)
	{
		
		if (arr[i] < 0)
			count += 1;
		
	}
	printf("%d ", count);
	int num = 0;
	int a = 0;
	for (int i = 0; i < n; i++)
	{
		if (arr[i] > 0)
		{
			sum += arr[i];
			num += 1;
		}
		if (arr[i]==0)
		{
			a++;
		}
	}
	if (a != n)
	{
		ave = sum / num;
		printf("%.1lf", ave);
	}
	else
		printf("0.0");
	return 0;
}