Hints on every problem. Every problem now has a Hint button next to Run and Submit. If you’ve been stuck on a problem, or never started one because you didn’t know where to begin, this is for you.
Round 3: Saturday, October 3. The round runs for 24 hours, from 00:00 to 24:00 UTC, so you can take part from any time zone and spend as long on it as you want…