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Given a node in a binary tree, implement the algorithm for finding its next in-order node in the containing tree.
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You have a directed connected graph. Write an algorithm that detects any cycle, if one exists, and returns a list of its nodes.
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Given a Singly Linked List, write an algorithm to find the middle node. You may not use more than one loop of any kind.
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A linked list is given. Write an algorithm that detects whether it's a singly linked list or a circularly linked list.
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