1012 数字分类 (20分)

#include<stdio.h>
int main()
{
	int a1=0, a2=0, a3=0,  i=0, n, m,flag=1,cot=0,max=-1,f2=0;
	double a4=0;
	scanf("%d", &n);
	for (i = 0; i < n; i++)
	{
		scanf("%d", &m);
		int k = m % 5;
		switch (k)
		{
		case 0: {if (m % 2 == 0) a1 += m; break; }
		case 1: {a2 += flag * m; flag = -flag; f2 = 1; break; }
		case 2: {a3++; break; }
		case 3: {a4 += 1.0*m; cot++; break; }
		case 4: {if (m > max) max = m;  break; }
		}
	}
	a4 = a4 / (1.0*cot);
	if (a1 == 0) printf("N"); else printf("%d", a1);
	if (f2 == 0) printf(" N"); else printf(" %d", a2);
	if (a3 == 0) printf(" N"); else printf(" %d", a3);
	if (cot == 0) printf(" N"); else printf(" %.1f", a4);
	if (max == -1) printf(" N"); else printf(" %d", max);
	return 0;
}