It says right on the tin that this is meant for IOI/ICPC-style contests, whose participants are high school and undergraduate students respectively. As a forme

It says right on the tin that this is meant for IOI/ICPC-style contests, whose participants are high school and undergraduate students respectively. As a former competitor in USACO, ACSL, etc., I would have loved to have resources like this around for practice and self-study back in high school.