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Maximum Product of the Length of Two Palindromic Substrings

You are given a 0-indexed string s and are tasked with finding two non-intersecting palindromic substrings of odd length such that the product of their lengths is maximized.

You are given a 0-indexed string s and are tasked with finding two non-intersecting palindromic substrings of odd length such that the product of their lengths is maximized.

More formally, you want to choose four integers i, j, k, l such that 0 <= i <= j < k <= l < s.length and both the substrings s[i...j] and s[k...l] are palindromes and have odd lengths. s[i...j] denotes a substring from index i to index j inclusive.

Return the maximum possible product of the lengths of the two non-intersecting palindromic substrings.

A palindrome is a string that is the same forward and backward. A substring is a contiguous sequence of characters in a string.

Maximum Product of the Length of Two Palindromic Substrings diagram

Example 1

Input: s = "ababbb"

Output: 9

Explanation: Substrings "aba" and "bbb" are palindromes with odd length. product = 3 * 3 = 9.

Example 2

Input: s = "zaaaxbbby"

Output: 9

Explanation: Substrings "aaa" and "bbb" are palindromes with odd length. product = 3 * 3 = 9.

Constraints

  • 2 <= s.length <= 10^5
  • s consists of lowercase English letters.

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