London | 25-SDC-July | Mikiyas Gebremichael | Sprint 2 | Improve code with precomputing

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Changelist

Precomputing means doing calculations once in advance and reusing the results instead of repeating the same work.
It makes programs faster by trading extra memory for reduced computation time.
For example, counting all characters once and storing the results is faster than scanning the string repeatedly.

Questions

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