Leetcode-With-Python/2. Add Two Numbers at main · alanherprovat/Leetcode-With-Python · GitHub

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# time complexity is o(n) and sc complexity is o(1)

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def addTwoNumbers(self, l1: Optional[ListNode], l2: Optional[ListNode]) -> Optional[ListNode]:
        l11 =l1
        l22=l2
        tail=l1
        c=0
        while(l1 and l2):
            s=l1.val+l2.val+c
            c=s//10
            s=s%10
            print(s)
            l1.val=s
            if(l1.next != None):
                l11=l11.next

            l1=l1.next
            l2=l2.next

        while(l1):
            s=c+l1.val
            c=s//10
            s=s%10
            l1.val=s
            if(l1.next != None):
                l11=l11.next
            l1=l1.next

        while(l2):
            s=c+l2.val
            c=s//10
            s=s%10
            l11.next=ListNode(s)
            l11=l11.next


            l2=l2.next


        if(c>0):
            new=ListNode(c)
            l11.next=new


        return tail