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Grokking the Coding Interview Patterns in Go

Solution: Largest Palindromic Number

Explore how to apply a greedy pattern to construct the largest palindromic number from a given digit string. This lesson guides you through counting digit frequencies, choosing digits from highest to lowest to build palindrome halves, and selecting the middle digit optimally. Understand the step-by-step process and algorithm to solve this problem with O(n) complexity.

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Statement

You are given a string num consisting of digits from 00 to 99. Your task is to return the largest possible palindromic number as a string by using some or all of the digits in num. The resulting palindromic number must not have leading zeros.

Note: You may reorder the digits freely, and you must use at least one digit from the num string.

Constraints:

  • 1≤1\leq num.length ...