Solution: Largest Odd Number in String
Explore how to find the largest odd integer substring in a given numeric string by scanning from the end. Understand the greedy approach that identifies the rightmost odd digit to form the solution efficiently with constant space and linear time.
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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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