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对数组hash，这个果然很好很强大

Posted by happynp at 2008-07-06 21:15:10 on Problem 3274
In Reply To:这个题过不过的了，全看hash写得好不好 Posted by:ACman at 2007-07-20 21:15:15 
从网上搞来的，好像是折叠法
inline int hashcode(const int *v)
{
	int s = 0;
	for(int i=0; i<k; i++)
		s=((s<<2)+(v[i]>>4))^(v[i]<<10);
	s = s % M;
	s = s < 0 ? s + M : s;
	return s;
}
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