線性結構3 Reversing Linked List ——鏈表順序存儲實現

題目： 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 

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