Leetcode 2. Add Two Numbers (Medium) - Intuition & Solutions (Java)

Hi! I hope this helps with Leetcode 2. Let me know if you have questions or suggestions.
Approach #1 (building out two integers & explanation of incorrectness): 4:38 - 12:30.
Accepted Approach #2 (manually adding two integer values): 13:30. Coding starts at 16:14 - 22:38.
Explanation of BigInteger solution (accepted): 23:38. See more on BigInteger -- docs.oracle.co...