Substring Problem

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How many times does the integer K occur in the sequence obtained by writing out all the natural numbers from 1 to N, without any whitespace in between. For example, if N = 20, the sequence would look like 1234567891011121314151617181920 In the above sequence, the integer 12 occurs exactly 2 times. Also, the integer 11 appears exactly 2 times. Note that the two occurances of 11 overlap, bu

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solution.cppC++17

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