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解题思路

public class Solution {
       public static ListNode reverseKGroup(ListNode head, int k) {
   		if(head == null || head.next == null || k < 2) return head;		ListNode dummy = new ListNode(0);		dummy.next = head;		ListNode pre = dummy, cur = head, temp;		int len = 0;		while (head != null) {
   			len ++ ;			head = head.next;		}		for (int i = 0; i < len / k; i ++ ) {
   			for (int j = 1; j < k; j ++ ) {
   				temp = cur.next;				cur.next = temp.next;				temp.next = pre.next;				pre.next = temp;			}			pre = cur;			cur = cur.next;		}		return dummy.next;	}}

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