Two strings, X and Y, are considered similar if either they are identical or we can make them equivalent by swapping at most two letters (in distinct positions) within the string X.
For example, "tars" and "rats" are similar (swapping at positions 0 and 2), and "rats" and "arts" are similar, but "star" is not similar to "tars", "rats", or "arts".
Together, these form two connected groups by similarity: {"tars", "rats", "arts"} and {"star"}. Notice that "tars" and "arts" are in the same group even though they are not similar. Formally, each group is such that a word is in the group if and only if it is similar to at least one other word in the group.
We are given a list strs of strings where every string in strs is an anagram of every other string in strs. How many groups are there?
\n
Example 1:
\n\n\nInput: strs = ["tars","rats","arts","star"]\nOutput: 2\n\n\n
Example 2:
\n\n\nInput: strs = ["omv","ovm"]\nOutput: 1\n\n\n
\n
Constraints:
\n\n1 <= strs.length <= 3001 <= strs[i].length <= 300strs[i] consists of lowercase letters only.strs have the same length and are anagrams of each other.如果交换字符串 X 中的两个不同位置的字母，使得它和字符串 Y 相等，那么称 X 和 Y 两个字符串相似。如果这两个字符串本身是相等的，那它们也是相似的。
例如，\"tars\" 和 \"rats\" 是相似的 (交换 0 与 2 的位置)； \"rats\" 和 \"arts\" 也是相似的，但是 \"star\" 不与 \"tars\"，\"rats\"，或 \"arts\" 相似。
总之，它们通过相似性形成了两个关联组：{\"tars\", \"rats\", \"arts\"} 和 {\"star\"}。注意，\"tars\" 和 \"arts\" 是在同一组中，即使它们并不相似。形式上，对每个组而言，要确定一个单词在组中，只需要这个词和该组中至少一个单词相似。
给你一个字符串列表 strs。列表中的每个字符串都是 strs 中其它所有字符串的一个字母异位词。请问 strs 中有多少个相似字符串组？
\n\n
示例 1：
\n\n\n输入：strs = [\"tars\",\"rats\",\"arts\",\"star\"]\n输出：2\n\n\n
示例 2：
\n\n\n输入：strs = [\"omv\",\"ovm\"]\n输出：1\n\n\n
\n\n
提示：
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"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "[\"tars\",\"rats\",\"arts\",\"star\"]\n[\"omv\",\"ovm\"]",
"__typename": "QuestionNode"
}
}
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