A number is called digit-increasing if it is equal n + nn + nnn + ... for some digit n between 1 and 9. For example 24 is digit-increasing because it equals 2 + 22 (here n = 2).

Actually, a friend of mine asked me this question and i am stuck thinking about it but couldn't find the exact solution so far. Can anyone help ? I needed the function that returns true if it is digit-increasing else false.

c++ c algorithm logic
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