487. Is Valid Number
0
Hard
You are given a string s ( a number) . You have to find out that the given number is valid or not .
A valid number can be split up into these components (in order):
1.A decimal number or an integer.
2.(Optional) An 'e' or 'E', followed by an integer.
A decimal number can be split up into these components (in order):
1.(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 YES if s is a valid number.
A valid number can be split up into these components (in order):
1.A decimal number or an integer.
2.(Optional) An 'e' or 'E', followed by an integer.
A decimal number can be split up into these components (in order):
1.(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 YES if s is a valid number.
Input Format
Single Line consists of a string s.
Output Format
Print "YES" or "NO"
Example
Input
123.45
Output
YES
Constraints
1 <= s.length <=10000
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