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拜托,哥德巴赫猜想是指的偶数,别人输入也是偶数。。。

Posted by bingshen at 2011-05-09 13:50:42 on Problem 2262
In Reply To:请玩POJ的高手看看,我的代码为什么TLE,而且感觉这个题有点问题啊 Posted by:num9332 at 2010-08-21 15:26:14
> 有人说不可能出现猜想错误的情况,但是题目是说任意一个大于6的数都能分解成两个奇质数,15怎么分解成两个奇质数?那么猜想不就错误了?还有人贴AC的代码,我拿去验证后发现他的程序把15分解成3和12,感觉很奇怪。请大家看看我的代码是什么问题,谢谢了!
> #include <stdio.h>
> #include <math.h>
> int prime[1000001];
> int main()
> {
> 	int i,j,k,m,b;
> 	for(i=2;i<1000001;i++)
> 	{
> 		k=sqrt(i);
> 		for(j=2;j<=k;j++)
> 		{
> 			if(i%j==0)
> 				break;
> 		}
> 		if(j>k)
> 			prime[i]=1;
> 		else
> 			prime[i]=0;
> 	}
> 	while(1)
> 	{
> 		scanf("%d",&m);
> 		if(m==0)
> 			break;
> 		for(i=3;i<=m/2;i++)
> 		{
> 			b=m-i;
> 			if(prime[i]==1&&prime[b]==1)
> 			{
> 				printf("%d=%d+%d\n",m,i,b);
> 				break;
> 				
> 			}
> 		}
> 		if(i>m/2)
> 		{
> 			printf("Goldbach's conjecture is wrong.\n");
> 		}
> 	}
> 	return 0;
> }

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