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原创 中国大学MOOC-陈越、何钦铭-数据结构－02-线性结构3 Reversing Linked List (25 分)

原题目： Given a constant K and a singly linked list L, you are supposed to reverse the links of every K elements on L. For example, given L being 1→2→3→4→5→6, if K=3, then you must output 3→2→1→6→5→4; if K=4, you must output 4→3→2→1→5→6. Input Specification: