leetCode No.143 Reorder List

题目 Given a singly linked list L: L0→L1→…→Ln-1→Ln, reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→… node You must do this in-place without altering the nodes’ values.git For example, Given {1,2,3,4}, reorder it

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