You are given two strings, word1 and word2, of equal length. You need to transform word1 into word2.
For this, divide word1 into one or more contiguous substrings. For each substring substr you can perform the following operations:
Replace: Replace the character at any one index of substr with another lowercase English letter.
Swap: Swap any two characters in substr.
Reverse Substring: Reverse substr.
Each of these counts as one operation and each character of each substring can be used in each type of operation at most once (i.e. no single index may be involved in more than one replace, one swap, or one reverse).
\n\nReturn the minimum number of operations required to transform word1 into word2.
\n
Example 1:
\n\nInput: word1 = "abcdf", word2 = "dacbe"
\n\nOutput: 4
\n\nExplanation:
\n\nDivide word1 into "ab", "c", and "df". The operations are:
"ab",\n\n\t"ab" -> "ba"."ba" -> "da"."c" do no operations."df",\n\t"df" -> "bf"."bf" -> "be".Example 2:
\n\nInput: word1 = "abceded", word2 = "baecfef"
\n\nOutput: 4
\n\nExplanation:
\n\nDivide word1 into "ab", "ce", and "ded". The operations are:
"ab",\n\n\t"ab" -> "ba"."ce",\n\t"ce" -> "ec"."ded",\n\t"ded" -> "fed"."fed" -> "fef".Example 3:
\n\nInput: word1 = "abcdef", word2 = "fedabc"
\n\nOutput: 2
\n\nExplanation:
\n\nDivide word1 into "abcdef". The operations are:
"abcdef",\n\n\t"abcdef" -> "fedcba"."fedcba" -> "fedabc".\n
Constraints:
\n\n1 <= word1.length == word2.length <= 100word1 and word2 consist only of lowercase English letters.给你两个长度相等的字符串 word1 和 word2。你的任务是将 word1 转换成 word2。
为此，可以将 word1 分割成一个或多个连续子字符串。对于每个子字符串 substr，可以执行以下操作：
替换：将 substr 中任意一个索引处的字符替换为另一个小写字母。
交换：交换 substr 中任意两个字符的位置。
反转子串：将 substr 进行反转。
每种操作计为 一次 ，并且每个子串中的每个字符在每种操作中最多只能使用一次（即任何字符的下标不能参与超过一次替换、交换或反转操作）。
\n\n返回将 word1 转换为 word2 所需的 最小操作数 。
子串 是字符串中任意一个连续且非空的字符序列。
\n\n\n\n
示例 1：
\n\n输入： word1 = \"abcdf\", word2 = \"dacbe\"
\n\n输出： 4
\n\n解释：
\n\n将 word1 分割为 \"ab\"、\"c\" 和 \"df\"。操作如下：
\"ab\"：\n\n\t\"ab\" -> \"ba\"。\"ba\" -> \"da\"。\"c\"：无需操作。\"df\"：\n\t\"df\" -> \"bf\"。\"bf\" -> \"be\"。示例 2：
\n\n输入： word1 = \"abceded\", word2 = \"baecfef\"
\n\n输出： 4
\n\n解释：
\n\n将 word1 分割为 \"ab\"、\"ce\" 和 \"ded\"。操作如下：
\"ab\"：\n\n\t\"ab\" -> \"ba\"。\"ce\"：\n\t\"ce\" -> \"ec\"。\"ded\"：\n\t\"ded\" -> \"fed\"。\"fed\" -> \"fef\"。示例 3：
\n\n输入： word1 = \"abcdef\", word2 = \"fedabc\"
\n\n输出： 2
\n\n解释：
\n\n将 word1 分割为 \"abcdef\"。操作如下：
\"abcdef\"：\n\n\t\"abcdef\" -> \"fedcba\"。\"fedcba\" -> \"fedabc\"。\n\n
提示：
\n\n1 <= word1.length == word2.length <= 100word1 和 word2 仅由小写英文字母组成。word1. For the DP, we try both the substring and its reversed version (just add one extra operation)",
"First we swap pairs like (word1[i], word2[i]) and (word1[j], word2[j]) where word1[i] == word2[j] and word2[i] == word1[j]",
"For the remaining characters, we use replace operations"
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