2074. Reverse Nodes in Even Length Groups

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You are given the head of a linked list. The nodes in the linked list are sequentially assigned to non-empty groups whose lengths form the sequence of the natural numbers (1, 2, 3, 4, ...). The length of a group is the number of nodes assigned to it. In other words, - The 1st node is assigned to the first group. - The 2nd and the 3rd nodes are assigned to the second group. - The 4th, 5th, and

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solution.cppC++17

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