Hello codeforces,

as you may know, the famous book "Looking for a challenge?" is quite beloved by our community, given it has really interesting/hard problems and editorials from problem's writer itself.

Recently I got back to my copy, craving to know if I could solve it entirely. On each question statement, the book gives you a URL for that particular question. The problem is, they are outdated. The last time I tried to upload a solution to that URL, at least it gave me another option to it. But now, this is what we see:

For those who don't know polish (Or don't know the magic of google translate), this domain is no longer being properly used to host the questions.

After searching through the web (also here), I couldn't find the site that I once visited, and fortunately I found! Here it is: https://szkopul.edu.pl/

Since some of you do not have a copy yet, the value of the book is in each writer's explanation (which I'm not allowed to make it public) of their question and lastly the questions are public to be solved, I took the time to gather the links to those precious (and freaking hard!! ò.ó) questions:

1. Ants
2. Hyperclock
3. Fishes
4. Pilots
5. Skiers
6. Barricades
7. Travel Agency
8. Mushrooms
9. Sweets
10. Coding of permutations
11. Rooks
12. Monkeys
13. Plotter : your help comes here
14. Termites
15. Window
16. Altars
17. Axes of Symmetry
18. Leonardo Numbers
19. Ritual : your help comes here
20. Questions
21. Chocolate
22. Fibonacci sums
23. The search : your help comes here
24. Hashing : your help comes here
25. Afternoon tea
26. Kangaroos
27. Sums
28. Superknight
29. Ice skates
30. Termites 2
31. Cave
32. Shuffle
33. Game of tokens :
34. Straight lines
35. Guilds
36. Reconstruction of byteland
37. Army training
38. Riddle
39. Fuel
40. Ploughing
41. Canoes
42. Painter's studio
43. Triangles :
44. Triangles 2
45. Circular game
46. Byteland
47. Cakes
48. Building blocks
49. Matching
50. Party :
51. Dice
52. Two parties
53. Guesswork :

For those eagle eyed readers, some questions I couldn't find there, I'm sorry =(

But fear not! If you have the particular missing link, please leave a comment so we can make it complete. Also, if you found anything wrong on this list, also let me know so I can fix it (It's a pretty long list and I'm tired from working all day).

Cheers!