Round 1:

1. Schedule of Tasks
2. https://leetcode.com/problems/binary-tree-maximum-path-sum
3. https://leetcode.com/problems/maximum-subarray

Round 2:

1. https://leetcode.com/problems/custom-sort-string
2. https://leetcode.com/problems/read-n-characters-given-read4 (premium)

Round 3 [System design]:

1. Design Instagram

Round 4:

1. https://leetcode.com/problems/remove-invalid-parentheses

Round 5 [System design]:

1. Design keyword search in FB Posts