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Largest Even Number
Easy Accuracy: 20.37% Submissions: 54 Points: 2

Given an integer S. Find the largest even number that can be formed by rearranging the digits of S.

Note: In case the number does not contain any even digit then output the largest odd number possible.

Example 1:

Input:
S = "1324"
Output: "4312"
Explanation: Largest even number: 4312

Example 2:

Input:
S = "3555"
Output: "5553"
Explanation: No even number possible,
So we'll find largest odd number.

Your Task:  
You don't need to read input or print anything. Your task is to complete the function LargestEven() which takes the string as inputs representing the integer and returns the answer.

Expected Time Complexity: O(|S| * log |S|)
Expected Auxiliary Space: O(1)

Constraints:
1 ≤ |S| ≤ 105
S contains only digits from '0' to '9'.

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Largest Even Number

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