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ACM试题Problem K:Ones Description Given any integer 0 <= n <= 10000 not divisible by 2 or 5,
ACM试题Problem K:Ones
Description
Given any integer 0 <= n <= 10000 not divisible by 2 or 5, some multiple of n is a number which in decimal notation is a sequence of 1 s. How many digits are in the smallest such a multiple of n?