[算法] - 合并两个有序链表(牛客网算法-NC33)

1. 描述

合并两个有序链表，出自牛客网算法NC33

2. 代码

package com.jfp;

public class Test3 {
    /**
     *
     * @param l1 ListNode类
     * @param l2 ListNode类
     * @return ListNode类
     */
    public static ListNode mergeTwoLists (ListNode l1, ListNode l2) {
        ListNode head = new ListNode();
        ListNode curr = head;
        while (l1 != null || l2 != null){
            if(l1 == null){
                curr.next = l2;
                break;
            } else if (l2 == null){
                curr.next = l1;
                break;
            }else if(l1.val < l2.val){
                curr.next = l1;
                l1 = l1.next;
                curr = curr.next;
            } else {
                curr.next = l2;
                l2 = l2.next;
                curr = curr.next;
            }
        }

        return head.next;
    }

    public static class ListNode {
        int val;
        ListNode next = null;
    }

    public static void main(String[] args) {
        ListNode listNode1 = new ListNode();
        listNode1.val=888;
        ListNode listNode = mergeTwoLists(null, listNode1);
        System.out.println(listNode.val);
    }
}