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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.
这道题和string to integer有相似之处。主要就是各类情况都要考虑清楚。有人用finite automata 去做。我还是偏向于直接写代码。有一个地方卡了好久不过，也不晓得为什么。
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