You are given a string s and an array of strings words. All the strings of words are of the same length.
A concatenated string is a string that exactly contains all the strings of any permutation of words concatenated.
words = ["ab","cd","ef"], then "abcdef", "abefcd", "cdabef", "cdefab", "efabcd", and "efcdab" are all concatenated strings. "acdbef" is not a concatenated string because it is not the concatenation of any permutation of words.Return an array of the starting indices of all the concatenated substrings in s. You can return the answer in any order.
\n
Example 1:
\n\nInput: s = "barfoothefoobarman", words = ["foo","bar"]
\n\nOutput: [0,9]
\n\nExplanation:
\n\nThe substring starting at 0 is "barfoo". It is the concatenation of ["bar","foo"] which is a permutation of words.
\nThe substring starting at 9 is "foobar". It is the concatenation of ["foo","bar"] which is a permutation of words.
Example 2:
\n\nInput: s = "wordgoodgoodgoodbestword", words = ["word","good","best","word"]
\n\nOutput: []
\n\nExplanation:
\n\nThere is no concatenated substring.
\nExample 3:
\n\nInput: s = "barfoofoobarthefoobarman", words = ["bar","foo","the"]
\n\nOutput: [6,9,12]
\n\nExplanation:
\n\nThe substring starting at 6 is "foobarthe". It is the concatenation of ["foo","bar","the"].
\nThe substring starting at 9 is "barthefoo". It is the concatenation of ["bar","the","foo"].
\nThe substring starting at 12 is "thefoobar". It is the concatenation of ["the","foo","bar"].
\n
Constraints:
\n\n1 <= s.length <= 1041 <= words.length <= 50001 <= words[i].length <= 30s and words[i] consist of lowercase English letters.给定一个字符串 s 和一个字符串数组 words。 words 中所有字符串 长度相同。
s 中的 串联子串 是指一个包含 words 中所有字符串以任意顺序排列连接起来的子串。
words = [\"ab\",\"cd\",\"ef\"]， 那么 \"abcdef\"， \"abefcd\"，\"cdabef\"， \"cdefab\"，\"efabcd\"， 和 \"efcdab\" 都是串联子串。 \"acdbef\" 不是串联子串，因为他不是任何 words 排列的连接。返回所有串联子串在 s 中的开始索引。你可以以 任意顺序 返回答案。
\n\n
示例 1：
\n\n\n输入：s = \"barfoothefoobarman\", words = [\"foo\",\"bar\"]\n输出：[0,9]\n解释：因为 words.length == 2 同时 words[i].length == 3，连接的子字符串的长度必须为 6。\n子串 \"barfoo\" 开始位置是 0。它是 words 中以 [\"bar\",\"foo\"] 顺序排列的连接。\n子串 \"foobar\" 开始位置是 9。它是 words 中以 [\"foo\",\"bar\"] 顺序排列的连接。\n输出顺序无关紧要。返回 [9,0] 也是可以的。\n\n\n示例 2：
\n\n\n输入：s = \"wordgoodgoodgoodbestword\", words = [\"word\",\"good\",\"best\",\"word\"]\n输出：[]\n解释：因为 words.length == 4 并且 words[i].length == 4，所以串联子串的长度必须为 16。\ns 中没有子串长度为 16 并且等于 words 的任何顺序排列的连接。\n所以我们返回一个空数组。\n\n\n示例 3：
\n\n\n输入：s = \"barfoofoobarthefoobarman\", words = [\"bar\",\"foo\",\"the\"]\n输出：[6,9,12]\n解释：因为 words.length == 3 并且 words[i].length == 3，所以串联子串的长度必须为 9。\n子串 \"foobarthe\" 开始位置是 6。它是 words 中以 [\"foo\",\"bar\",\"the\"] 顺序排列的连接。\n子串 \"barthefoo\" 开始位置是 9。它是 words 中以 [\"bar\",\"the\",\"foo\"] 顺序排列的连接。\n子串 \"thefoobar\" 开始位置是 12。它是 words 中以 [\"the\",\"foo\",\"bar\"] 顺序排列的连接。\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 \\u5df2\\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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