Solution: Number of Substrings Containing All Three Characters
Explore the sliding window technique to efficiently count substrings in a string that contain at least one 'a', 'b', and 'c'. Understand how to expand and shrink the window, track character frequencies, and calculate the total valid substrings with optimal time and space complexity.
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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:
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