LeetCode 876. Middle of the Linked List (链表的中间结点)

题目标签：Linked List

　　题目让我们找到中间点，可以利用快慢指针，具体看code。

Java Solution:

Runtime: 0 ms, faster than 100% 

Memory Usage: 33MB, less than 100%

完成日期：05/04/2019

关键点：快慢指针

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
    public ListNode middleNode(ListNode head) {
        ListNode slow = head;
        ListNode fast = head;
        
        while(fast != null && fast.next != null) {
            slow = slow.next;
            fast = fast.next.next;
        }
        
        return slow;
    }
}

参考资料：N/A

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