Solution: Largest Odd Number in String
Explore how to identify the largest odd-valued substring within a numeric string using a greedy approach. Learn to scan from the end to find the rightmost odd digit, then extract the substring up to that point efficiently with O(n) time complexity and constant space usage.
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Statement
You are given a string, num, which represents a large integer. Your task is to find the largest odd-valued integer that can be formed as a non-empty substring of num. Return this odd integer as a string. If no odd integer exists, return an empty string ("").
Note: A substring is a continuous sequence of characters within a string.
Constraints:
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