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sample测试的时候出问题可是居然AC...Orz...

Posted by majia5 at 2008-09-07 10:01:43 on Problem 2613
double solve()
{
	double ret=1,i;
	for(i=1;i<=q;i++)ret*=(p-q+i)/i;
	for(i=1;i<=s;i++)ret*=i/(r-s+i);
	return ret;
}
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