Solution: Number of Substrings Containing All Three Characters
Explore the sliding window method to count substrings containing at least one 'a', 'b', and 'c'. Understand how expanding and shrinking the window tracks valid substrings efficiently, achieving a linear time solution with constant space.
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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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