Round statistics sample
Sent — participants count, who made at least one problem submission
Pretest — participants count, who's solution stuck on pretests
Hacked — participants count, who's solution was hacked, and didn't pass hack sample
Systest — participants count, who's solution stuck on system tests
Accepted — participants count, who solved the problem
Attempts — attempts count for the problem
Success % — Accepted count / Attempts count
Severity — average attempts count among participants, who solved the problem
Median Score — median score value for solved problem
Hacks — successful(+) and unsuccessful(-) hacking attempts count (invalid tests and compilation errors are ignored)
Graphic representation of Pretest / Hacked / Systest / Accepted columns.
Right-most value — participants count.
Tables and graphs drawing: Google Charts.
Manual actions: Paint.NET + Notepad++ :)