I had 2 phone interviews with Meta, I had a really bad experience with the first one so they scheduled a second one.

In the first interview I was asked :

1. https://leetcode.com/problems/subarray-sum-equals-k/ (This is where I had the bad experience. The interviewer argued that there is an O(1) space complexity solution)

In the second interview I was asked :

1. https://leetcode.com/problems/binary-search-tree-iterator/ (Gave the stack approach)
2. https://leetcode.com/problems/powx-n/ (Solved in O(log N) time and space)

The second interview went on very well. I got an email from the recruiter saying that they are moving me to the onsite rounds.

Any tips and guidance for the onsite interviews would be greatly appreciated.