4 Interviews 1 hour each back-to-back (1 pm to 5 pm)

Round 1: (Bar raiser)

• LP questions
• Find Patient zero, given a list infectors and infectee
  e.g.
  Student 1 infects Student 2 i.e. 1->2
  2->3
  7->5
  4->12
  8->11
  8->13
  ... etc
  A student can only be infected by only one student but a single student can infect many students.
  I believe this is a basic directed graph building question and output should be the head of the graph.

Round 2:

• LP questions.
• Design Chess.

Round 3:

• LP questions.
• Alien dictionary variation. The interviewer was rushing me through the problem.

Round 4:

• Design Twitter.

..... That's all folks