Saturday, May 2, 2015

Digit Counts

Q:
Count the number of k's between 0 and n. k can be 0 - 9.
Example
if n=12, in [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12], we have FIVE 1's (1, 10, 11, 12)

A:



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