why?!? u might be asking, well... because if u know advanced math, when u open a math problem u just need to think and KABOOM, u solved it in less than 10 minutes! also because most problem (ABC & ABCD) in div 2 and 3 are math problems. for beginners (like me) u should start by working on algebra, combinatorics, and number theory problems numbered 1-5 on the AIME. it really helped me.
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Auto comment: topic has been updated by Meron3r (previous revision, new revision, compare).
Why codeforces is not accepting solution, it showing queue since morning ?