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單鏈表的反轉

單鏈表 nod pre listnode null style public ever lis

單鏈表的反轉

    public ListNode ReverseList(ListNode head) {
        
        if(head == null)return null;
        
        ListNode pre = null;
        ListNode next = null;
        
        while(head != null){
            next = head.next;
            head.next = pre;
            pre = head;
            head 
= next; } return pre; }

單鏈表的反轉