Leetcode
2020.05.04 08:55

876. Middle of the Linked List

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Given a non-empty, singly linked list with head node head, return a middle node of linked list.

If there are two middle nodes, return the second middle node.

 

Example 1:

Input: [1,2,3,4,5]
Output: Node 3 from this list (Serialization: [3,4,5])
The returned node has value 3.  (The judge's serialization of this node is [3,4,5]).
Note that we returned a ListNode object ans, such that:
ans.val = 3, ans.next.val = 4, ans.next.next.val = 5, and ans.next.next.next = NULL.

Example 2:

Input: [1,2,3,4,5,6]
Output: Node 4 from this list (Serialization: [4,5,6])
Since the list has two middle nodes with values 3 and 4, we return the second one.

 

Note:

  • The number of nodes in the given list will be between 1 and 100.


/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode middleNode(ListNode head) {
        ListNode node = head;
        int count = 0;
        
        while(node != null){
            count++;
            node = node.next;
        }
        
        node = head;
        for(int i=0; i<count/2; i++){
            node = node.next;
        }
        
        return node;
    }
}


/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode middleNode(ListNode head) {
        List<ListNode> list = new ArrayList<>();
        ListNode node = head;
        int count = 0;
        
        while(node != null){
            count++;
            list.add(node);
            node = node.next;
        }
        
        return list.get(count/2);
    }
}

[문제] https://leetcode.com/problems/middle-of-the-linked-list/



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