Solution: Number of Substrings Containing All Three Characters
Explore the sliding window method to efficiently count substrings that include at least one 'a', 'b', and 'c' in a given string. Understand how to expand and shrink the window to track required characters and optimize substring counting with linear time 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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