Hello Codeforces! I wanted to request something from the codeforces community. To start i need to give some introduction : I couldn't participate in a contest in a time and i just thought of trying to be a tester for the first time then i messaged Hamed_Ghaffari,The writer of Codeforces Round 1124 (Div. 1) and Codeforces Round 1124 (Div. 2) that i want the permission to test and he said ok and give me the access without saying anything else. Then i said something very little that i can say it had an epsilon value of effect on the contest and i didn't say anything else. And after some hours i noticed the big mistake i've taken and i tried to fix it. Then i told the story to my new teacher Arpa and he said you first should read some rules and accept them to become a tester and testers were just some special people and the contest writers couldn't invite anyone as testers and some of them even had salary. I want to say that, No one ever told me that we have something like this about testing which for example someone agree with it and then be a tester? and i was looking all of the codeforces and didn't see any blog about this so i decided to write my own. If someone knows the rules i'll be happy if he writes in comments.

if it isn't regular can you tell me why i get bad verdicts a lot?

Hey Codeforces Community! I wanted to request to update the rating after cf round 1114 (div. 3) contest usually The rate was changed a day after the contest(ig 12 hours because the contests are regularly at 18:05 at Iran Standard Time(UTC+3:30)) but for this contest, we've been waiting for longer time. Can someone explain the reason?

Hello..I was solving problems of cf round 1083 Div.2 and when i encountered problem B i was fighting with time limit error i used the famous O(sqrt(n)) algorithm to detect prime numbers..but is there an algorithm from better order or not?

Thank you for reading:)