题解 | #记负均正#

#include<stdio.h>
int main()
{
	int n = 0;
  //初始化，顺便求和
	while (~scanf("%d", &n) != 0)
	{
		int arr[2000] = { 0 };
		double sum = 0.0;
		int count = 0;
		int i = 0;
		for (i = 0; i < n; i++)
		{
			scanf("%d", &arr[i]);
			if(arr[i] > 0)
				sum += arr[i];
		}
      //求个数，求平均值
		int tmp = n;//下面n是会变的，保证循环次数不能变
		for (i = 0; i < tmp; i++)
		{
			if (arr[i] < 0)
			{
				count++;
				n-=1;
			}
			if (arr[i] == 0)
				n-=1;
		}
		double aver = sum / n;
		printf("%d %.1lf\n", count, aver);
	}
	return 0;
}