lgm_'s blog

Resources needed for OI training + Mathematical Reasoning
By lgm_, history, 5 months ago, In English

Next year is my last chance for IOI and I wanna give my best to get there. I'm facing a few issues and want to ask for help.

1. I'm very bad at reasoning and proving basic mathematical problems/claims

I face a very hard time when facing mathematical problems regarding number theory and mathematics and their proofs. The only proof I know about is PROOF BY AC. other than that, I don't know anything but sometimes it isn't good. I think I need to develop it on mathematics side and if someone knows some sort of website like Codeforces where I can practice my proving skills a.k.a. basic practice for IMO please tell in comments. My goal is to NOT go to IMO but I think that would help a lot.

2. Need beginner friendly resource for OI practice where I can practice problems in ascending order of difficutly

My current practice rating on codeforces is 1600. I'm planning to solve the entire first page of problemset of 1600(in ascending order). I also wanna grind OI problems because they're quite different from cf problems. The only website I know is qoj.ac on which I find the problems very hard so I'd like if someone knows any website/cf group from where I can start from easy OI problems, please let me know in comments.

Additional info: for some reason I find USACO bronze very hard and I couldn't even solve a single problem in US Open so that's why I don't usually practice there.

Question

I'm very serious about my dedication. Even though I have like 7-8 months for next year's IOI team selection, I'm ready to practice with full zeal and zest.

Thank you!

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5 months ago, # |
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I'm not sure if it'll help you, but you can find a lot of mathemathical problems at https://artofproblemsolving.com/community/c13_contest_collections . On this site there are a lot of problems from previous math competitions (including the IMO). I personaly use this website to practice math (btw not to flex but I have an IMO medal). If you were going for IMO I'd say you use this but because you said you aren't going for IMO I'm not sure if it'll be of much help to you.

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    5 months ago, # ^ |
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    Bro I didnt know you had an IMO medal, orz

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    5 months ago, # ^ |
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    yeah aops has a great stuff but can u please suggest what contests to practice on i am still beginner(i was able to solve this year's IMO P1 though as it was easy),i found jbmo which seems a little beginner friendly but i would love to know ur suggestion

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