Validate if a given string is numeric.
Some examples:
"0" => true" 0.1 " => true"abc" => false"1 a" => false"2e10" => true
Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before implementing one.
My solution is tedious, and I consider three possibilities separately.
A relatively simple solution is given by someone's post on LeetCode's forum:
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