Leetcode, Add Two Numbers, Programming, Leetcode Medium, Java.
l1 and l2 are null and there is no carry, return null. Step 2: Add the values of the current nodes (l1 and l2) and the carry. Step 3: Calculate the sum and the new carry. Step 4: Create a new node with the value of sum % 10. Step 5: Recursively call the function with the next nodes of l1 and l2,