Recently I had a math course. Here are some interesting problems I selected from my practice history. Solve one problem a day, and do it for 21 days. Then your mathematical ability will greatly improve.

23 - 55 + 51 - 37 - 42 - 36 = ?
52 + 33 + 1 + 83 + 51 - 21 = ?
33 - 83 + 63 - 86 + 34 + 54 = ?
63 + 58 + 5 + 19 - 49 - 38 = ?
22 + 9 - 9 + 14 + 75 - 56 = ?
17 + 45 - 54 - 90 - 67 + 69 = ?
44 - 36 + 92 - 91 + 27 + 12 = ?
99 - 1 - 20 - 2 - 27 - 37 = ?
50 - 52 - 72 - 11 + 96 - 99 = ?
92 + 13 + 84 - 51 + 10 + 42 = ?
31 + 29 + 71 - 21 - 61 - 66 = ?
86 - 12 + 56 + 11 + 29 - 55 = ?
72 - 96 + 45 - 13 + 55 + 75 = ?
24 + 22 + 66 + 44 - 64 - 44 = ?
91 + 15 - 49 + 99 - 62 - 33 = ?
22 - 37 - 17 + 13 + 24 + 38 = ?
37 - 70 + 79 + 89 - 36 + 79 = ?
67 + 65 - 61 - 6 - 68 + 16 = ?
27 - 11 - 64 - 7 - 63 + 21 = ?
34 - 26 - 44 + 55 - 56 + 34 = ?

When you finished them DM me to check if your solutions work out. You can also stress test them offline in your own environment.

Is that the reason that contests nowadays are so few? I want more contests!!! And why I still cannot see Goodbye 2024 on contest board???? Even Luogu holds contests per every 3 days!!

If you cheat you destroy Codeforces so donot cheat!!! Make Codeforces Great Again!!! If you cheat you have no mom no dad and your whole family will suck!!!!!! Fu.ck Cheaters!!!!!

if you are like me and get downvotes on litreally every comment it means your rating is not high enough!!! So you must solve problems and it will increase!

I am going to solve some problems and my contribution will very very high if my rating gets higher!!!

Also you can upvote my blogs so I will upvote your all blogs and comments!

if u donot debug it out urself u won't improve that's truth but many people still ask for debugging and trash the blog section dont destroy codeforces please!!!!!!!!! Long live the great codeforces fu.ck debuggeres!!!!!

Recently there has been lots of trolling blogs. We should work together to stop them from trashing this website. If we donot after years Codeforces will be destroyed!!!

Orz to ZengDingjun_EggArmy. He can beat me in any aspects of life. I'm getting serious illness because of this distress. Please help.

His real rating, ex-real rating, ext. ex-real rating, ext. ex-real rating pro is all higher than me. His contribution is more absolute than me. His rating is more unique than me. He has a much more successful life than me. He always beat me in official contests. He even took the name I want to be.