Class ListNode

Python/add two linked list.py:3–6

# ADD TWO SORTED LINKED LIST

class ListNode:
    def __init__(self, val=0, next=None):
        self.val = val
        self.next = next
class Solution:
        def mergeTwoLists(self,l1:ListNode,l2:ListNode)->ListNode:
            cur=ListNode(0)