Leetcode Problem 1358. Number of Substrings Containing All Three Characters

1358. Number of Substrings Containing All Three Characters

Leetcode Solutions

Sliding Window Approach

  1. Initialize three pointers: left and right to 0, and count to 0.
  2. Create a frequency map freq to keep track of the count of 'a', 'b', and 'c' within the window.
  3. Expand the window by moving right pointer to the right, updating the frequency map accordingly.
  4. When all three characters are present in the window, perform the following steps: a. Increment count by the number of possible substrings from left to the end of the string. b. Contract the window by moving left pointer to the right and updating the frequency map. c. Repeat steps 4a and 4b until the window no longer contains all three characters.
  5. Repeat steps 3 and 4 until right reaches the end of the string.
  6. Return the count as the final result.
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Brute Force Approach

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