You are given a string s and an array of strings words. All the strings of words are of the same length.
A concatenated substring in s is a substring that 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 substring because it is not the concatenation of any permutation of words.Return the starting indices of all the concatenated substrings in s. You can return the answer in any order.
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Example 1:
\n\n\nInput: s = "barfoothefoobarman", words = ["foo","bar"]\nOutput: [0,9]\nExplanation: Since words.length == 2 and words[i].length == 3, the concatenated substring has to be of length 6.\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.\nThe output order does not matter. Returning [9,0] is fine too.\n\n\n
Example 2:
\n\n\nInput: s = "wordgoodgoodgoodbestword", words = ["word","good","best","word"]\nOutput: []\nExplanation: Since words.length == 4 and words[i].length == 4, the concatenated substring has to be of length 16.\nThere is no substring of length 16 in s that is equal to the concatenation of any permutation of words.\nWe return an empty array.\n\n\n
Example 3:
\n\n\nInput: s = "barfoofoobarthefoobarman", words = ["bar","foo","the"]\nOutput: [6,9,12]\nExplanation: Since words.length == 3 and words[i].length == 3, the concatenated substring has to be of length 9.\nThe substring starting at 6 is "foobarthe". It is the concatenation of ["foo","bar","the"] which is a permutation of words.\nThe substring starting at 9 is "barthefoo". It is the concatenation of ["bar","the","foo"] which is a permutation of words.\nThe substring starting at 12 is "thefoobar". It is the concatenation of ["the","foo","bar"] which is a permutation of words.\n\n\n
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Constraints:
\n\n1 <= s.length <= 1041 <= words.length <= 50001 <= words[i].length <= 30s and words[i] consist of lowercase English letters.Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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