You are given two strings, word1 and word2. You want to construct a string in the following manner:
subsequence1 from word1.subsequence2 from word2.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.
\n\n\n
Example 1:
\n\n\nInput: word1 = "cacb", word2 = "cbba"\nOutput: 5\nExplanation: Choose "ab" from word1 and "cba" from word2 to make "abcba", which is a palindrome.\n\n
Example 2:
\n\n\nInput: word1 = "ab", word2 = "ab"\nOutput: 3\nExplanation: Choose "ab" from word1 and "a" from word2 to make "aba", which is a palindrome.\n\n
Example 3:
\n\n\nInput: word1 = "aa", word2 = "bb"\nOutput: 0\nExplanation: You cannot construct a palindrome from the described method, so return 0.\n\n
\n
Constraints:
\n\n1 <= word1.length, word2.length <= 1000word1 and word2 consist of lowercase English letters.给你两个字符串 word1 和 word2 ，请你按下述方法构造一个字符串：
word1 中选出某个 非空 子序列 subsequence1 。word2 中选出某个 非空 子序列 subsequence2 。subsequence1 + subsequence2 ，得到字符串。返回可按上述方法构造的最长 回文串 的 长度 。如果无法构造回文串，返回 0 。
字符串 s 的一个 子序列 是通过从 s 中删除一些（也可能不删除）字符而不更改其余字符的顺序生成的字符串。
回文串 是正着读和反着读结果一致的字符串。
\n\n\n\n
示例 1：
\n\n输入：word1 = \"cacb\", word2 = \"cbba\"\n输出：5\n解释：从 word1 中选出 \"ab\" ，从 word2 中选出 \"cba\" ，得到回文串 \"abcba\" 。\n\n
示例 2：
\n\n输入：word1 = \"ab\", word2 = \"ab\"\n输出：3\n解释：从 word1 中选出 \"ab\" ，从 word2 中选出 \"a\" ，得到回文串 \"aba\" 。\n\n
示例 3：
\n\n输入：word1 = \"aa\", word2 = \"bb\"\n输出：0\n解释：无法按题面所述方法构造回文串，所以返回 0 。\n\n
\n\n
提示：
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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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