At the beginning of my undergraduate studies, I became very interested in competitive programming. The most famous competition is the ICPC, which consists of several phases until the World Finals. In each phase a team of three members must solve as many problems as possible from a list of around 12 problems whithin 5 hours.
Here are some precious memories from my years as a contestant and some of my favorite problems.
Here are some of my favorite competitive programming problems. Problems enter this list either because they made me excited about learning something new, or because they are related to my favorite topics in CP:
Extra, not CP-related: I really like the book Combinatorial Problems and Exercises by László Lovász, and problems 3, 4, and 5 of the Automorphisms of Graphs section kind of blew my mind.