# encoding: utf-8
"""
 @project:data_structure_and_algorithm
 @author: Jiang Hui
 @language:Python 3.7.2 [GCC 7.3.0] :: Anaconda, Inc. on linux
 @time: 2019/8/2 09:40
 @desc:
"""


# Definition for singly-linked list.
class ListNode(object):
    def __init__(self, x):
        self.val = x
        self.next = None


class Solution(object):
    def merge(self, l1, l2):
        """
        :type l1: ListNode
        :type l2: ListNode
        :rtype: ListNode
        """
        dummy = ListNode(None)
        cur = dummy
        while l1 and l2:
            if l1.val <= l2.val:
                cur.next = l1
                l1 = l1.next
            else:
                cur.next = l2
                l2 = l2.next
            cur = cur.next
        if l1:
            cur.next = l1
        if l2:
            cur.next = l2
        return dummy.next
