• Question
• Solution

Question

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.

Solution

Result: Accepted Time: 80 ms

Here should be some explanations.

class Solution(object):
    def isNumber(self, s):
        """
        :type s: str
        :rtype: bool
        """
        s = s.strip();
        if  len(s) == 0 :
            return False
        try:
            a = float(s)
            return True
        except:
            return False

Complexity Analytics

• Time Complexity: $O(n)$
• Space Complexity: $O(1)$