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Leetcode 1876 substrings of size three with distinct characters. This is a super easy leetcode question to start with to practice the sliding window approach. Coding in Python on LeetCode with the following time and space complexity: O(n) time and O(n) space. Probably would have been better to not slice the string and just done s[i], s[i-1], s[i-2] comparisons but I thought it would be easier to read and now looking back, i think just doing the above indexing is the wave. Slicing is O(n) space a
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