Package g0001_0100.s0030_substring_with_concatenation_of_all_words

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    30 - Substring with Concatenation of All Words.

    Hard

    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.

    • For example, if 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.

    Example 1:

    Input: s = "barfoothefoobarman", words = "foo","bar"

    Output: 0,9

    Explanation:

    Since words.length == 2 and wordsi.length == 3, the concatenated substring has to be of length 6.

    The substring starting at 0 is "barfoo". It is the concatenation of "bar","foo" which is a permutation of words.

    The substring starting at 9 is "foobar". It is the concatenation of "foo","bar" which is a permutation of words.

    The output order does not matter. Returning 9,0 is fine too.

    Example 2:

    Input: s = "wordgoodgoodgoodbestword", words = "word","good","best","word"

    Output: []

    Explanation:

    Since words.length == 4 and wordsi.length == 4, the concatenated substring has to be of length 16.

    There is no substring of length 16 is s that is equal to the concatenation of any permutation of words.

    We return an empty array.

    Example 3:

    Input: s = "barfoofoobarthefoobarman", words = "bar","foo","the"

    Output: 6,9,12

    Explanation:

    Since words.length == 3 and wordsi.length == 3, the concatenated substring has to be of length 9.

    The substring starting at 6 is "foobarthe". It is the concatenation of "foo","bar","the" which is a permutation of words.

    The substring starting at 9 is "barthefoo". It is the concatenation of "bar","the","foo" which is a permutation of words.

    The substring starting at 12 is "thefoobar". It is the concatenation of "the","foo","bar" which is a permutation of words.

    Constraints:

    • <code>1 <= s.length <= 10<sup>4</sup></code>

    • 1 &lt;= words.length &lt;= 5000

    • 1 &lt;= words[i].length &lt;= 30

    • s and words[i] consist of lowercase English letters.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final List<Integer> findSubstring(String s, Array<String> words)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait