void solve()
{
	
	int left=0,right=n/2,ans;


	while(left<=right)
	{
		mid=(left+right)/2;
		if(check())
			left=mid+1,ans=mid;
		else
			right=mid-1;
	}
	if(ans>=4)
	      printf("%d\n",ans+1);
	else
		printf("0\n");
}

AC，但left=4就wa,大牛们能回答下吗?

• Re:why? (23) doublets 2010-04-14 22:56:46