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不是哥们我才过两个怎么总排466啊。。E题给我卡死了，模拟题没去写他（其实简单的，尤其是都学过sql了题意很容易看明白）。
一个数n的因子个数实际上远远小于sqrt(n)，1e9以内这个数最多为几千差不多。