pat(B) 1012. 数字分类

代码：

#include<iostream>
#include<cstdio>
#include<cstring>
#define INF 1<<30
using namespace std;

int a[1005];

int main()
{
	int n;
	int i,j;
	while(scanf("%d",&n)==1)
	{
		int ans1=0,ans2=0,ans3=0,ans5=-INF;
		double ans4;
		int s=0;
		int cnt=0;
		int k=0;
		for(i=0;i<n;i++)
		{
			scanf("%d",&a[i]);
			if(a[i]%5==0&&a[i]%2==0)
			{
				ans1+=a[i];
			}
			if(a[i]%5==1)
			{
				++cnt;
				if(cnt%2==1)
					ans2+=a[i];
				else
					ans2-=a[i];
			}
			if(a[i]%5==2)
				ans3++;
			if(a[i]%5==3)
			{
				s+=a[i];
				k++;
			}
			if(a[i]%5==4)
			{
				if(a[i]>ans5)
				{
					ans5=a[i];
				}
			}
		}
		ans4=s*1.0/k;
		if(ans1==0)
			printf("N ");
		else
			printf("%d ",ans1);
		if(cnt==0)
			printf("N ");
		else
			printf("%d ",ans2);
		if(ans3==0)
			printf("N ");
		else
			printf("%d ",ans3);
		if(k==0)
			printf("N ");
		else
			printf("%.1lf ",ans4);
		if(ans5==-INF)
			printf("N\n");
		else
			printf("%d\n",ans5);
	}
	return 0;
}

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