I applied through another source. The process took 3 weeks.

I can't remember the exact process, but in summary there were 5 meetings:

• Motivation.
• Algorithms: graphs, recursion, arrays, trees, and dynamic programming.
• System design: a distributed system with concurrent reads and writes.
• Object and class design requiring data structure trade-off reasoning.
• Low-level performance and architecture discussion.

1. Dynamic programming
2. Graphs bfs/dfs
3. Array/lists
4. Design distributed service