Meta interview experience........

1. Coding Round

• Given the root of a binary tree, return the vertical order traversal of its nodes' values. (i.e., from top to bottom, column by column). If two nodes are in the same row and column, the order should be from left to right.
• https://leetcode.com/problems/merge-k-sorted-lists/description/ - for three lists and not k. You can not use extra space or DS apart from variables.

2. Coding Round

• https://leetcode.com/problems/valid-palindrome/description/
• https://leetcode.com/problems/random-pick-index/

3. System Desin

• Design a ad click aggregator system.

4. System Design

• Design how would you handle peek traffic for event booking platform for large events.

5. Behaviour Round

• Questions about your past experience. Do not remember them exactly.

Waiting for feedback.
Update: Rejected.