easyGreedyMathString 0 views

Largest Odd Number in String

You are given a string num, representing a large integer.

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 <= 10^5
num only consists of digits and does not contain any leading zeros.

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class Solution {
    public String largestOddNumber(String num) {
        
    }
}

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