Topcoder has been a famous competitive programming platform and I've heard of Topcoder for years. I've never participated in Topcoder though. Like many of my friends, I started to really participate in online rounds since 2018, and Topcoder's fame already seemed to fade.

Last year, I did attempt to participate in a SRM, but I met various difficulties. Possibly I'm not clever enough but participating in SRM is indeed much complicated than participating a Codeforces Round.

• I couldn't