Regarding IOI, that's a common misconception people have about high school olympiads: "The top 50% of the contestants are awarded medals, such that the relative

Regarding IOI, that's a common misconception people have about high school olympiads: "The top 50% of the contestants are awarded medals, such that the relative number of gold : silver : bronze : no medal is approximately 1:2:3:6 (thus 1/12 of the contestants get a gold medal)."