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g1701_1800.s1771_maximize_palindrome_length_from_subsequences.readme.md Maven / Gradle / Ivy

1771\. Maximize Palindrome Length From Subsequences

Hard

You are given two strings, `word1` and `word2`. You want to construct a string in the following manner:

*   Choose some **non-empty** subsequence `subsequence1` from `word1`.
*   Choose some **non-empty** subsequence `subsequence2` from `word2`.
*   Concatenate the subsequences: `subsequence1 + subsequence2`, to make the string.

Return _the **length** of the longest **palindrome** that can be constructed in the described manner._ If no palindromes can be constructed, return `0`.

A **subsequence** of a string `s` is a string that can be made by deleting some (possibly none) characters from `s` without changing the order of the remaining characters.

A **palindrome** is a string that reads the same forward as well as backward.

**Example 1:**

**Input:** word1 = "cacb", word2 = "cbba"

**Output:** 5

**Explanation:** Choose "ab" from word1 and "cba" from word2 to make "abcba", which is a palindrome.

**Example 2:**

**Input:** word1 = "ab", word2 = "ab"

**Output:** 3

**Explanation:** Choose "ab" from word1 and "a" from word2 to make "aba", which is a palindrome.

**Example 3:**

**Input:** word1 = "aa", word2 = "bb"

**Output:** 0

**Explanation:** You cannot construct a palindrome from the described method, so return 0.

**Constraints:**

*   `1 <= word1.length, word2.length <= 1000`
*   `word1` and `word2` consist of lowercase English letters.