Hi guys,

I am reading the book Competitive Programming 3 from Steven Halim. However, I am having a bit of trouble as there are no solutions to starred (difficult) questions (For easy one, there are very clear answers, I wonder why?). I wonder if there are any official or unofficial sources where I can find some hints to these difficult questions?

Another question is that, has anyone tried this website? (By Mr. Halim too)

https://www.comp.nus.edu.sg/~stevenha/methodstosolve.html

It is said to contain hints to many problems. However, I have found no ways to see these hints. Clicking on the hint button (?) does not return anything. Is there anyone knowing how to use it or it really does contain nothing.

Could you please help me? Thank you.