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this task is not Elementary

This task is not Elementary (elementary means @Veky can solve it as one-liner). It is also not Simple or Moderate. This task is Challenging. So far I have spent whole day on it and I still do not have an efficient solutuion.

Created: Jan. 17, 2020, 10:43 p.m.
Updated: Jan. 18, 2020, 12:57 p.m.
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tivvit