1) Write a function to find the nth Fibonacci number. 2) Optimize your code so that the numbers don't have to be recalculated on consecutive function calls.
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Reverse a linked list
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Given a linked list, flip every pair of nodes, such that if given a-b-c-d-e, return b-a-d-c-e.
Given two different strings, find the common characters between the two. For example if string A is "hello" and string B is "elbow" the common characters would be ['e', 'l', 'o']. Give a method that returns unique or duplicate entries.
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