Round 1 :

Online Proctored Code Signal Test : 5 Questions were given
Could code only 2 out of 5 and 1 partial solution.

Round 2 :

1. Meeting Room II :https://leetcode.com/problems/meeting-rooms-ii/

2. Attaching an image for description of question.
   Given 2 images represented by squares containing only symbols B,W (in inputs of image)
   Some rules are given : B + W = G, B + B = B , W + W = W. Each image can be represented by a square which could be split into 4 squares(Again each smaller square could be divided in 4 squares). You have to give a representation of the image in terms of a data structure and then write a code for
   adding two images.

Could give representation of the image in terms of a Tree but couldn't write proper solution(couldn't find a similar question) for the second question. Please suggest an approach/solution for 2nd question.

Round 3 :

Design Facebook Messenger.