largest-odd-number-in-string_1903.py

# You are given a string num, representing a large integer. Return the largest-valued odd integer (as a string) that is a non-empty substring of num, or an empty string "" if no odd integer exists.

# A substring is a contiguous sequence of characters within a string.
# Example 1:

# Input: num = "52"
# Output: "5"
# Explanation: The only non-empty substrings are "5", "2", and "52". "5" is the only odd number.
# Example 2:

# Input: num = "4206"
# Output: ""
# Explanation: There are no odd numbers in "4206".
# Example 3:

# Input: num = "35427"
# Output: "35427"
# Explanation: "35427" is already an odd number.


# Constraints:

# 1 <= num.length <= 105
# num only consists of digits and does not contain any leading zeros.

# ---------------------------------------Runtime 53 ms Beats 64.91% Memory 17.9 MB Beats 19.52%---------------------------------------


class Solution:
    def largestOddNumber(self, num: str) -> str:
        for i in range(len(num) - 1, -1, -1):
            if int(num[i]) % 2 != 0:
                return num[: i + 1]
        return ""