Leetcode - Add Two Numbers (Python)

January 2021 Leetcode Challenge
Leetcode - Add Two Numbers #2

[Nico_Fragale]

I cant understand why leetcode output is "memory limit exceeded"

[abstract_machine]

Why do you need to convert from string to int to string? To me the problem doesnt necessarily imply theyre strings, it mentions digits.

Is there something implied I'm missing ?

[Zerio]

Came here to remind myself of how Linked List's even work lol. I didnt really do the same strategy as you.

Managed to get quite a shitty solution at first, but then optimized it quite a bit
So satisfying when it just clicks for you haha

Thank you mate! <3

[aceataya]

hello Tim! thanks for this video on how you showed us multiple solutions and way of thinking.
I just have a question regarding the first line where you put dummy=cur=listnode(), why did you do that?
like for example at the end couldn't youreturn just curr.next?

[bigdrewpy]

Is the purpose of the dummy node so that you can hold onto a reference to the beginning of the result list after building it?

[ruslanruslan]

Can anybody explain me? In the begin we wrote "dummy = cur". After that we updating "cur" in the while-loop. But we don't update "dummy". So how "dummy" is updating together with "cur" if we don't redefine "dummy = ..."

[phillipwei]

Hi Tim! The part where you coded "if not n1" and "if not n2", could you explain what that means syntactically?