Since I just achieved the rank of specialist in the first contest of 2024, I decided to make another AMA. Please use common sense before posting here.
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Codeforces (c) Copyright 2010-2024 Михаил Мирзаянов
Соревнования по программированию 2.0
Время на сервере: 17.11.2024 13:14:56 (j2).
Десктопная версия, переключиться на мобильную.
При поддержке
What is 672+1586-1586?
665
Is 561 a prime ?
not in $$$\mathbb Z$$$ since $$$561=3\cdot11\cdot17$$$
Z sign is for intergers, isn't it?
No sum of its digits is divisible by 3, then the whole number is divisible by 3.
Do you have a girlfriend?
how many time have you listened to this song?
0
bitset?
bitset?
bitset?
bitset?
bitset?
bitset?
bitset?
I use python
do you like cookies?
yes
no
I also used to write posts like these when I was specialist. A wise man said, "I will ask u when u become an expert". But now, nobody asks me anything
when cm?
In my dreams, I have become CM
I will ask u when you and I become CMs
Hi, can you look at my graph, and give me some tips for reaching an expert? How should i go about solving problems , i don't have the confidence to go beyond the second question , coz it gets so hard , in Div 2s
Congratulations on becoming specialist. Wishing you good luck on your journey to pupil
d
I would sign up and get the 30 free spins
d) -3
-c
x=-3
Are you DottedCaculator from Alcumus? I'm not stalking, I swear, but I remember seeing your username on the Alcumus hall of fame once and I could never forget how it was missing an 'l'.
possibly
Damn coincidences on the internet :) Just found his comments in the live chat of Evan Chen solving CF1628C on an old live stream. Guy has too much math-connections. It must be him. Also his blog on an IMO problem.
Observe my codeforces activity and tell me how to be a specialist
Something helped me to get to specialist: so have these 2 extensions installed(I'll tell u why rn): Cf Analytics, CodeForces Practice Tracker
After that open your profile, and you'll see a red tab named statics, will get to that later scroll down under your rating graph you should have smth like this:(it's your graph btw)
As you can see here, you do a lot of questions but mainly 800 and haven't done almost anything more than 1400, that's bad my friend, Now go to the red statics tab, and you'll see your avg problem rating in the last week, if you wanna get to a rating s.t: 1400 try to have it average around 1300-1500, quality not quantity Do this for like 2weeks, also don't spoil the question by opening the tutorial, spent days, papers anything, but do it yourself for the questions: go to problemset, Filter from 1200 to 1600, with these tags: math, greedy, constructive, number theory, implementation, brute force, games, combinatorics and work on them Good luck my friends
I have 2 questions
1.I cant get a clue how to solve them even if i get some hint i still dont know what to use 2.i sometimes struggle lower rating still So shall i stop solving less than 1200?
for Q1: Editorial is forbidden, but if you've tried your absolute hardest and couldn't find a way, tried different ideas and non worked maybe it needs something you don't know, so after a lot of hard work feel free to check the editorial
for Q2: Something I do is I don't care when to AC, I might AC div2.A at 5/6min something I try to do is prove the solution 100% Try it and see if it works, look for flaws. Like even if when I see the question I instantly get the idea, idc, I'll prove it recommend this too and no don't stop, like if u think you still have problem, instead of 1200-1600, do 1000-1400, till u get good at them
suppose this problem
https://mirror.codeforces.com/contest/1916/problem/C
Now i couldn't realize why i have to divide 3. To solve this kind of problem what should i do?
I'm assuming you got the idea of prefix sum, which is good. So By now, you should think about what happens if I choose 2 items and insert sum/2 and you see the divide by 2 and after a while of thinking you'll get the idea of what happens if they're both odd, even, and different parity then try and see that oh, in different parity it benefits the first player so if the second player removes 2 odds at a time it'll be more beneficial, take this path and go to the answer
and as I said don't wait for a divine inspiration, take out a piece of paper and do the work this will help you, specially in math based problems, like for math/number theory/ combinatorics just take that damn piece of paper and do the work it's hard at first but you'll get used to it the key, secret answer is a pen and a paper, not a virtual white board, text editor, something you can feel
and for questions with programming ideas not mathematical ideas, just try every think and still use papers
You say that editorials should be used as the very last resort in problem solving. Is that opinion based on your experience? If that is so, and reading editorials does slow down your learning process, then how to deal with the frustration of inability to solve a problem?
Reading editorials doesn't slow it down, they aren't as much beneficial there are many things you learn while thinking about a problem you may even find a solution to another problem while thinking about this
And about the frustration, I actually don't have an always working solution, go play a game, take a nap, rest, or just motivate yourself by something
any tips for me? my activity is kinda messed up
Hello , Can you give me some suggestions to practice to get myself around 1400 ? I using , this method : sorted the latest problem upto max 1200 rating , and solving it ,will it work or I should solved by descending the highets number of submissions?
Pls suggest!
I mean if u put in ascending it'll always be 800, and basically wasting ur time so set it to 1100, and solve descending until reach 1000 rated problems then set it to 1200, and solve them until reach 1100rated problems and do this, if u rather to keep that strategy, otherwise, the strategy i believe in is posted above
Thanks for the suggestions mate ,
https://mirror.codeforces.com/problemset?tags=-1200
This is what i meant , can you share similar link as I am not getting what your point!?
https://mirror.codeforces.com/problemset?order=BY_RATING_DESC&tags=-1200
solve problems when you see them
are you drawing sth on your profile ?
no
Are you for real?
Imagine a situation .. u have 20 bucks and I have 20 bucks . WE club them together and we have a pool of 40 bucks . Now I buy ur 40 bucks for 30 bucks. So at the end I have 40 bucks and u have 30 buck . we made a total profit of 10 bucks each . Who is wrong here ?
ok, give me 20 bucks
what you do after a wrong answer on test 2?!
Say F***, And then check my algorithm, if you didn't prove it, but just thought it's reasonable and correct, prove it, if could: check your code, else: come up with another algorithm on a paper IMPORTANT: pen and a paper will 11 times out of 10 work better than code editors
solve the problem
I am a specialist too. Can you ask me something?
do you have another question?
what is the difference between int and long long
an issue C++ users have to deal with
and C users?
but you were an expert before that ...
how can i reach pupil :( can you help
solve problems in contests
haha thanks, but can you please share some practice strategy
get your lgm friend to solve problems for you and hack you
What's your type in women
International grandmaster
That's pretty high standards man
wtf
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