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牛人给瞧瞧,郁闷,兄弟是在没招了,程序还好读!

Posted by 0huzi0 at 2009-04-16 22:53:04 on Problem 2362
#include<iostream>
using namespace std;
int m,stick[30],count,used[30];
int cmp(const void *a,const void *b)
{
	return *(int*)a<*(int*)b?1:-1;
}
bool soval(int s,int side)
{
	if(side==0)
	{
		count++;
		return true;
	}
	for(int i=s;i<m;i++)
	{
		if(used[i] || side<stick[i])
			continue;
		if(soval(i+1,side-stick[i]))
		{
			used[i]=true;
			return true;
		}
	}
	return false;
}
int main()
{
	int n,i,all,side;
	scanf("%d",&n);
	while(n--)
	{
		scanf("%d",&m);
		all=0;
		count=0;
		memset(used,false,sizeof(used));
		for(i=0;i<m;i++)
		{
			scanf("%d",&stick[i]);
			all+=stick[i];
		}
		side=all/4;
		if(side*4==all)
		{
			qsort(stick,m,sizeof(stick[0]),cmp);
			if(stick[0]>side)
			{
				printf("no\n");
			}
			else
			{
				while(soval(0,side));
				if(count==4)
				{
					printf("yes\n");
				}
				else
				{
					printf("no\n");
				}
			}
		}
		else
		{
			printf("no\n");
		}
	}
	return 0;
}

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