Leetcode Problem 30. Substring with Concatenation of All Words

30. Substring with Concatenation of All Words

Leetcode Solutions

Sliding Window Approach

  1. Initialize variables for the length of s, the number of words, the length of each word, and the total length of a concatenated substring.
  2. Create a hash table wordCount to track the frequency of each word in words.
  3. Define a function slidingWindow that takes an index left and starts a sliding window from left.
  4. Use a hash table wordsFound to keep track of the words in the current window and an integer wordsUsed to count the number of words used.
  5. Slide the window across s using a right pointer, checking for valid substrings and updating wordsFound and wordsUsed accordingly.
  6. If the window is valid, add the starting index to the result.
  7. Move the left pointer to shrink the window if necessary, especially when encountering excess words.
  8. Repeat the sliding window process for each possible starting index, which is up to the length of a word in words.
  9. Return the result containing all starting indices of valid substrings.
UML Thumbnail

Check All Indices Using a Hash Table

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