1903 Largest Odd Number in String

A number would be odd if the number at the unit place num[-1] is odd. Check from the end of the string, once we come across an odd number, we stop and return.

Code:

Python3

class Solution:
    def largestOddNumber(self, num: str) -> str:
        curMax = -1
 
        i = len(num)-1
        while i > -1:
            if int(num[i]) % 2 != 0:
                break
            i -= 1
 
        return num[:i+1] if i != -1 else ''

Big O Analysis

• Runtime The runtime complexity here is $O(N)$ where N = length of string num.
• Memory The memory usage is O(1) since we don’t use any linear or non-linear data structure.

— A

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