Link: https://www.facebook.com/hackercup

Quoting:

From broken clocks to tuskfish, find out what inspires the engineers crafting questions for Facebook’s Hacker Cup, here!

Tune in here to see this years winners LIVE reveal at 10am PDT / 1pm EDT / 6pm GMT / 10.30pm IST.

It starts in an hour.

Edit: Submissions so far: https://www.facebook.com/hackercup/scoreboard/327966064573355/?filter=everyone