This is a completely new OA for 2021. The questions are time-consuming.

Make sure you are very familiar with the language you use for the test. The test cases are tricky.

Don't expect to pass all of them; just move on to the next question if you get stuck in one.

I don't remember all of them.

1. Given two strings, add two numbers.
2. Log file: Find whether there are machine problems based on the log.
3. A traveler can choose several routes to different places. Each route has a time and value. Maximize the values while ensuring the traveler can come back.
4. Don't remember.