by Hang Wu
Last Updated October 16, 2018 08:20 AM

The problem is described in here. Though we can count the number of pandigital numbers not greater than $n$, denoted by $c_n$, in $O(log(n))$, by enumerating from high to low digits, but we cannot perform direct binary search on $\frac{c_n}{n}$ since it is not monotonically increasing.

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