If you use Facebook, you might want to check out my new page https://www.facebook.com/errichto. I will post some short problems, puzzles I know/heard (maybe also not-algo puzzles, who knows), mention upcoming contests or cool problems from recent ones, sometimes share my thoughts about an algorithm or a contest. Kind of a blog, but likely with shorter but more frequent posts. Cheers!

PS. next Competitive Programming stream will be on Monday, div2 C-D problems from recent CF rounds, 12pm CEST.