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Solution: Number of Substrings Containing All Three Characters

Explore how to use the sliding window pattern to count substrings containing all three characters 'a', 'b', and 'c'. Understand window expansion and contraction to efficiently solve this problem in linear time with constant space.

Statement

Given a string s that consists only of the characters 'a', 'b', and 'c', return the number of substrings that contain at least one occurrence of each of the three characters.

Constraints:

  • 33 \leq ...