Add Two Numbers | Linkedlist +Stack Pattern | Bruteforce to Optimised | Java Python C++
In this video, we'll solve Add Two Numbers (LeetCode 445) using the Stack Pattern, one of the most important techniques for Linked List interview questions.
Unlike the original Add Two Numbers problem, the digits are stored in forward order, making it impossible to add numbers directly from the head. We'll use two stacks to process the digits from right to left without modifying the original linked lists.
This problem is a great example of combining Stacks + Linked Lists to simplify reverse traversal and efficiently handle carry propagation.
What you'll learn:
Understanding the Add Two Numbers II problem
Why the Stack Pattern is needed
Using two stacks to simulate reverse traversal
Handling carry while building the answer
Step-by-step dry run
Optimal Java implementation
Time & Space Complexity analysis
Interview tips and common mistakes
Pattern Covered:
Stack Pattern
Linked List
Reverse Traversal using Stack
Carry Propagation
Time Complexity:
O(N + M)
Space Complexity:
O(N + M)
If you're preparing for FAANG, Walmart, Microsoft, Amazon, Adobe, Atlassian, Uber, or any Product-Based Company, this is a must-know Linked List interview problem that demonstrates the power of the Stack Pattern.
Rising Brain (DSA Sheet):
https://www.risingbrain.org/sheet
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