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<P>Consider a function which, for a given whole number n, returns the number of ones required when writing out all numbers between 0 and n. <BR><BR>For example, f(13)=6. Notice that f(1)=1. What is the next largest n such that f(n)=n?<BR></P>
<P>翻译：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(13)=6,现在f(1)=1,问下一个最大的f(n)=n的n是什么？<BR></P></DIV> 这个论坛是学习编程的好地方，有空可以多学习
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以上的题目在C。C++编程版块
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