PAT-A1074/B1025 Reversing Linked List/反转链表 题目内容及题解

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,

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