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Halloween Sale
Halloween Sale
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Haskell
Here are my approaches in c++, you can see the explanation here : https://youtu.be/VFVaLMRzhV4
Approach 1 O(n)
Approach 2 O(n) with recursion
Approach 3 O(1), incomplete solution (failure of a test case), feel free to comment to share a way to complete it.