Codeforces-158B

题目意思就是给你不同学生人数的组，要求一个组的人必须要在一辆车上，问你要几辆车，模拟一下

题目链接：http://codeforces.com/problemset/problem/158/B

AC代码：

#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#define MIN(x,y) x<y?x:y
#define MAX(x,y) x>y?x:y
using namespace std;
const int N=110000;
int a[N];
bool cmp(int x,int y)
{
	return x>y;
}
int main()
{
	int i,j,n,sum,p,pos,four,three,two,one;
	while(~scanf("%d",&n))
	{
		sum=0;
		four=0;
		three=0;
		two=0;
		one=0;
		pos=0;
		for(i=0;i<n;i++)
		{
			scanf("%d",&a[i]);
			if(a[i]==1)
			one++;
			if(a[i]==2)
			two++;
			if(a[i]==3)
			three++;
			if(a[i]==4)
			four++;
		}
	//	printf("%d %d %d %dn",one,two,three,four);
		sum+=four;
		if(one<three)
		{
			sum+=one;
			three=three-one;
			sum+=three;
			if(two%2==0)
			{
				sum+=(two/2);
			}
			else
			{
				sum+=(two/2+1);
			}
		}
		else if(three<one)
		{
			if(three!=0)
			{
				sum+=three;
				one=one-three;
			}
			if(one<two)
			{
				if(one%2==0)
				{
					one=one/2;
					two+=one;
					if(two%2==0)
					{
						sum+=two/2;
					}
					else
					{
						sum+=(two/2+1);
					}
				}
				else
				{
					one=one/2;
					two+=one;
					if(two%2==0)
					{
						sum+=two/2+1;
					}
					else
					{
						sum+=(two/2+1);
					}
					
				}
			}
			else if(one>two)
			{
				if(one%2==0)
				{
					one=one/2;
					two+=one;
					if(two%2==0)
					{
						sum+=two/2;
					}
					else
					{
						sum+=(two/2+1);
					}
				//	printf("%dn",sum);
				}
				else
				{
					one=one/2;
					two+=one;
					if(two%2==0)
					{
						sum+=two/2+1;
					}
					else
					{
						sum+=(two/2+1);
					}
				}
			}
			else if(one==two)
			{
				sum+=one;
			}
		}
		else if(three==one)
		{
			sum+=one;
			if(two%2==0)
			{
				sum+=(two/2);
			}
			else
			{
				sum+=(two/2+1);
			}
		}
		printf("%dn",sum);
	}
	return 0;
}

最后

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