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题目
A valid number can be split up into these components (in order):
- A decimal number or an integer.
- (Optional) An
'e'or'E', followed by an integer.
A decimal number can be split up into these components (in order):
- (Optional) A sign character (either
'+'or'-').
- One of the following formats:
- One or more digits, followed by a dot
'.'. - One or more digits, followed by a dot
'.', followed by one or more digits. - A dot
'.', followed by one or more digits.
An integer can be split up into these components (in order):
- (Optional) A sign character (either
'+'or'-').
- One or more digits.
For example, all the following are valid numbers:
["2", "0089", "-0.1", "+3.14", "4.", "-.9", "2e10", "-90E3", "3e+7", "+6e-1", "53.5e93", "-123.456e789"], while the following are not valid numbers: ["abc", "1a", "1e", "e3", "99e2.5", "--6", "-+3", "95a54e53"].Given a string
s, return true if s is a valid number.解题思路
这是一道典型的可以用有限状态机求解的题目…
- 作者:Thomas He
- 链接:https://notion-next-lovat-ten.vercel.app/article/problems/leetcode/65
- 声明:本文采用 CC BY-NC-SA 4.0 许可协议，转载请注明出处。