Quite a few people have written off problems E, D and C. I think this is unfair, and I urge everyone not to cheat!!! Rating is not the most important thing on codeforces, if you have risen in the rating dishonestly, then you will not rise above the person who merges codes in this way!!! If you find similar ones, write the identification codes here. I'm sorry for my poor English. Here are some decommissioned codes: