有一个整数n,写一个函数f(n),返回0到n之间出现的"1"的个数。比如f(1)=1；f(13)=6,问一个最大的能满足f(n)=n中的n是什么？例如：f(13)=6, 因为1,10,11,12,13.正好是6个1。解析：这题关键在效率上，在没有发现很科学、快速地计算出个数的情况下，可以采取缓存的机制。因为就2000000来说，计算时间就已经无法忍受了，因此，可以把以前的计算结果缓存...

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