Solution: Largest Odd Number in String
Explore how to identify the largest odd-valued integer within a numeric string by applying a greedy approach. This lesson helps you understand scanning techniques from the string's end to extract the maximum odd substring, optimizing time complexity to O(n) and space complexity to O(1).
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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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