Largest Palindromic Number
You are given a string num consisting of digits only.
You are given a string num consisting of digits only.
Return the largest palindromic integer (in the form of a string) that can be formed using digits taken from num. It should not contain leading zeroes.
Notes:
Example 1
Input: num = "444947137"
Output: "7449447"
Explanation: Use the digits "4449477" from "444947137" to form the palindromic integer "7449447". It can be shown that "7449447" is the largest palindromic integer that can be formed.
Example 2
Input: num = "00009"
Output: "9"
Explanation: It can be shown that "9" is the largest palindromic integer that can be formed. Note that the integer returned should not contain leading zeroes.
Constraints
- 1 <= num.length <= 10^5
- num consists of digits.
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