The idea is to use a resizable array (ArrayList in Java, vector in C) together with hashing. Resizable arrays support insert in Θ(1)
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An Efficient Solution is to use the count of previous window, while sliding the window. The idea is to create a hash map that stores elements.
How to Create Custom Keyboard Shortcuts on Mac – PC -Macs come with some truly incredible trackpad motions, and a lot of amazing Mac keyboard shortcuts