problem0065

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65. Valid Number

题目

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.

解题思路

见程序注释