Add Two Numbers (LeetCode) in Python — Linked List + Carry Trick

Walking through LeetCode 2 — Add Two Numbers — in Python. We'll
build the answer one digit at a time, using integer division and
modulus to handle the carry, and a dummy node to simplify the
linked-list construction.

🔗 Problem: https://leetcode.com/problems/add-two-numbers/

⏱ Chapters
0:00 Intro
0:05 Add Two Numbers — problem walkthrough
0:15 Carry & modulus: the math behind the loop
1:25 Different-length lists (placeholder zeros)
1:55 Code setup: dummy node + carry variable
2:25 Handling l1 / l2 with conditional .val
3:05 Sum, next node, advancing the pointers
3:55 Accepted ✅
Time: O(max(m, n))
Space: O(max(m, n))

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