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Grokking the Coding Interview Patterns in C++

Solution: Largest Palindromic Number

Explore how to efficiently construct the largest possible palindromic number by applying greedy techniques. This lesson guides you through counting digit frequencies, forming palindrome halves with the highest digits, and choosing the middle digit to maximize value, all while ensuring no leading zeros are included.

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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 ...