Amazon Interview Experience | Set 356 (For 6 Year Experienced)

I went through some interview rounds for SDE-2 in Amazon. Below is the format.

Round1:

It was a test on HackerEarth with two programming questions

Round 2:

1. Boundary Traversal of binary tree GeeksforGeeks Link
2. Find four elements a, b, c and d in an array such that a+b = c+d GeeksforGeeks Link
3. Write production ready code. Consider scenario for duplicates too.

Round 3:

1. Trapping Rain Water GeeksforGeeks Link
2. Next smallest palindrome GeeksforGeeks Link