In the last div2 that took place yesterday are full of cheaters. Around 200 people have same code in the first 300(proved in a blog) in problem D. Alas,nowadays leaderboard is full of cheaters. It's very alarming for codeforces. Mike should implement a **Report user's submission ** option to find out those cheaters(because some cheaters are so clever to fool the plagiarism detector). People here try hard and soul to solve 2-3 problems in 2.30 hours but these cheaters are ruining their hardwork. Unless there’s a severe punishment, soon code forces will lose it's ratings **CREDIBILITY ** .