Solution: Number of Substrings Containing All Three Characters
Explore how to apply the sliding window approach to count substrings that contain at least one 'a', 'b', and 'c'. Understand the method for expanding and shrinking the window to efficiently calculate all valid substrings without enumerating each one, optimizing 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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