Minimum Window Substring
Find minimum window substring containing all characters from t Example: s = "ADOBECODEBANC", t = "ABC" => "BANC"
Minimum Window Substring is the sliding window pattern: grow, shrink, and maintain just enough state to stay linear. It's a hard one for a reason: it stresses stateful scanning when the rules pile up. Once your window update rules are consistent, you get linear time almost for free.
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