If there is these types of contest, I think codeforces would be more interesting. 1. hackforces. This type of contest has absolutely zero pretest and weak system test. Some wrong code may get right if there is no hack. 2. the G takes it all. The point of problem would grow like 100 400 1600 6400 25600 102400.Exponentially. Who only barely solved g wins against who solved a~f in fast time. 3.Speed! The point of problem reduces by half in 30 minutes. The first to tenth solver of each problem would get increased point. Dear MikeMirzayanov