ValidNumber 題解

題目要求 這個題目很簡單，就是判斷輸入的字符串是不是合法的，比如說： "0" => true " 0.1 " => true "abc" => false "1 a" => false "2e10" => true " -90e3 " => true " 1e" => false "e3" => false " 6e-1" => true " 99e2.5 " => false "53.5e9

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