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大家帮我看看这个代码 为什么会超时呢??

Posted by Lemke at 2009-11-08 11:18:54 on Problem 2739
#include<stdio.h>
#include<math.h>
int prime(int x,int a[])
{
	int i,j,flag,k=0;
	for(i=2;i<=x;i++)
	{
		flag=1;
		for(j=2;j<=sqrt(i);j++)
		{
			if(i%j==0)
			{
				flag=0;break;
			}
		}
		if(flag)
		{
			a[k]=i;k++;
		}
	}
	return k;
}
int count(int x)
{
	int a[170],sum[170];
	int i,j,done=0;
	int n=prime(x,a);
	for(i=0;i<n;i++)
	{
		sum[i]=0;
		for(j=i;(j<n)&&(sum[i]<x);j++)
		{
			sum[i]=sum[i]+a[j];
			if(sum[i]==x)
			{
				done++;
				break;
			}
		}
	}
	return done;
}
			
			
main()
{
	int t[10],i=0;
	int x,j;
	while(x)
	{
		scanf("%d",&x);
		t[i]=count(x);i++;
	}
	for(j=0;j<i-1;j++)
	{
		printf("%d\n",t[j]);
	}
		
	
}

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