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Largest Odd Number in String

Explore how to extract the largest odd integer substring from a given string of digits using greedy techniques. This lesson helps you develop skills to recognize and implement efficient solutions by analyzing problem constraints and applying string manipulation strategies.

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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: ...