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# Amateur Authors, Lazy Testers and Jan Challange - 2018

 13 @admin : I feel that having 5 very easy problem and 4 problems with very high difficulty is not good, even if you want to target newcomers. I personally am never satisfied with solving a challenge partially. Many times I just don't attempt it, if I don't have solution for the original task. This may not be true for everyone, but I feel most people won't be satisfied with partially solving a problem. In the hindsight, you always think how to solve the main problem. Also, as an author I think problem originates in its original version. So solving a sub-task may not even be close to solving the original version. Or may be do a poll to actually understand how most of people thinks ? That means 5 very easy problem plus 4 hard problems - there is little scope to actually see the improvement for most people. You solve 5 problems for an year and then may be you are able to solve 6 problems. So in this one year, you can not really visualize the improvement. So have problems with difficulty gradient as smooth as possible. Also have partial scoring on the problem so everyone attempts and score some points. Because the same newcomers you targeted today, may not participate tomorrow because they can not see the improvement. In the long run, technically you will have huge participation, but retention will decline. Also, if there are other contests for beginners - Lunch Time etc. If there is need, have some other contests. Lowering the quality of an already reputed contest to fit in newcomers, would never be my suggestion. answered 16 Jan, 23:51 5★triveni 1.0k●1●4●11 accept rate: 12% 2 This, is completely correct. I agree with you, especially last 2 paragraphs. My opinion is best voiced by this line of yours- Lowering the quality of an already reputed contest to fit in newcomers, would never be my suggestion. (17 Jan, 02:00) There is a confusion about the interpretation of my statement. I have clarified it up in the above comment. Actually, I meant that we will err on the easier side than on the harder side for the first 5 problems (specifically, it will be more focused on the first four problems). (17 Jan, 14:40) admin ♦♦0★
 12 Hi Guys I was the author of problem KILLKTH and I am sorry that I messed up in my first contest as problem setter on codechef. There were some issues regarding problem during contest but I never got to know that some suboptimal solutions are getting AC, I know it was my mistake I hadn't checked too many AC submissions and the ones encountered were good enough. I am really sorry. Nevertheless, I learnt a lot of things out of this and will try to nullify these the next time I set some problem (If I get this golden opportunity again). I would like to thanks Triveni sir for pointing out my mistakes and helpping me in improving myself as a problem setter. answered 20 Jan, 00:34 5★killjee 466●9 accept rate: 5%
 7 Also, authors please make editorials when you submit questions. So that they can be posted asap after the contest. This will make contests better. answered 17 Jan, 00:27 71●2 accept rate: 0%
 6 @admin For KILLKTH problem brute force approach in C++ gave only 5 points and in python it gave 20 points. If I had used python then my rank would have been 226 instead of 289. This should not happen, please set appropriate time limit and test cases. answered 17 Jan, 02:33 5★rj25 189●4 accept rate: 0%
 4 One of the reasons behind problem CHEFPALS having this steep change (100, 100, 100, ~67, ~10, etc) is that it is a minimization problem. Maximization problems have a smoother gradient usually. The better the maximum score is in a minimzation problem like this one, the more difficult it is for the others to keep up. Say, if the best score is 10, you would need to get at most 20 to get 50 pts., i.e. within an absolute difference of only 10, which is negligible and means that this submission is almost as good as the top one, but got 50 pts. less. On the other hand, maximization problems offer a lot more chances. If the top score is 1,000,000 (i.e. 1 million), then to get 50 pts. you need to score at most 500,000 - i.e. within an absolute difference of 500,000 - which is much more manageable. What I mean is that score in points increases linearly with score of submissions, which is not the case in a minimization problem. answered 17 Jan, 16:30 4★sapfire 41●2 accept rate: 0% This makes sense. Now I am interested to know if the scoring function can be maped from exponential into linear type function. I am not saying it is needed, but if can be done, scoreboard will look better. So we won't see 100, 99.9997 .. 99.996 etc. Neither would we see scores like this month. (17 Jan, 18:30) triveni5★ In my opinion, the exponential function is all right as long as the scores aren't too varying (that might mean, in our case, tighter constraints, for example 10,000 or even 100,000 blocks instead of only 1,000 which would eliminate quadratic algorithms). For example, in a recent problem about Santa and the presents, which was a minimization problem, the scores were rather reasonable. (22 Jan, 01:18) sapfire4★ 3 Sorry, but what you have written here makes almost no sense. You can multiply all scores by 1e9 in your first example to get bigger absolute difference, if you want to :) At practice it depends on particular problem - for some of them such scoring function works well, for some it makes no sense. Problem being about maximization or minimization is not really related to it - issues are possible with both kinds of tasks. (26 Jan, 01:59) lebron7★
 4 This is my first time to post any comment,so Very sorry if my words will hurt u,but this is very necessary to tell u.. this is really very wierd Lazy tester,,i got to know that someone posted a solution of Problem-RECTANGL in january long challenge,,and it is very obvious that this solution is incorrect but still he/she got full points for this incorrect solution,,Now,i am not revealing his/her name,but i can show u that incorrect solution by submitting that solution (by me).. link of incorrect solution : https://www.codechef.com/viewsolution/17081334 take input : 1 2 3 4 and u will get to know everything.. Please don't be lazy for next time because your laziness can result into losing faith from codechef.. answered 19 Jan, 21:53 2★sapjv 41●3 accept rate: 0% I will forward this to @admin. Thank you. :) (19 Jan, 22:04) Must forward @vijju123 (19 Jan, 22:28) sapjv2★
 2 The idea of having first 5 easy questions and the rest 4 hard questions is of no practical benefit. Sure beginners would be able to solve more questions at first, but after a few months they are going to get stuck for a long while when they reach upto 5th problem, which shouldn't take long. The path from beginner to intermediate (solving 5th of Jan long) happens relatively quickly. But the next part, going from intermediate to advanced is a very lengthy process. The most motivating part about long challenges is that you can see your progress. Each time you solve more problems than your previous best, it feels like a milestone and makes you feel like you can keep improving, which is a feeling that would be deprived to all of the intermediate coders. The difficulty levels should increase in a linear way so that everyone can feel that they are improvising. If Codechef has enough budget and really want to improvise beginners without affecting the intermediate coders, they might as well start a parallel div 2 long contest with 7th problem of div1 being the 10th problem for div2 or any other reasonable equation. answered 17 Jan, 12:13 1.5k●2●15 accept rate: 14%
 1 I think that it was quite unfair to award points for wrong brute force solutions for small subtasks or large subtasks.This has happened to me quite a few times and recently in the problem link:https://www.codechef.com/JAN18/problems/PRTITION ,where i was awarded 20 points, may be many others like me for test case :2 8, this was the corner case even though the constraints of Subtask #1 (20 points): sum of N in all test cases ≤ 50, should not allow my solution to pass for 20 points.Actually i think this test case was not included for 20 points subtask. My solution link was :https://www.codechef.com/viewsolution/16891991 .Such issues affect the learning, as new comers may not be able to figure out ,as they will be convinced there answer is correct for small subtasks and create confusions.This is a serious matter of concern. The quality of problems was very good, but the first one was far too easy and such problem must not given, atleast in long contests. Happy Coding! answered 17 Jan, 20:26 152●1●7 accept rate: 0%
 1 just to weigh in here, i think the topics to which the question belongs should at least get visible as soon as the contest gets over. the editorials take time to publish, while in the meantime if we can get the topics at least, we can do some analysis about possible approach. answered 17 Jan, 22:12 11●1 accept rate: 0%
 1 Participants also solve the same problems but they are not paid, so why should you be paid to do the same ? You serious? The contestants are voluntarily solving problems while a tester is not voluntarily creating test sets. Its a job. they should be paid. If someone voluntarily wants to create test sets then that's different. I do not understand your logic, by that logic no body should be paid anything in the world if a counter example of such work being free (for friends for example) exists. If I drive my friend to office for free doesn't mean I am obliged to do that for free for everyone else in the world. answered 28 Jan, 19:56 303●4●9 accept rate: 25%
 0 So this is the reason for my first five AC XD answered 17 Jan, 15:58 93●3 accept rate: 0%
 0 i agree with the idea that problems have generally steep difficulty level mostly after 5th. they shld have gradually increasing difficulty level. This helps us to keep track of our progress. sudden rise in difficulty level demotivates mamy programmers as they think that they are not able to make any progress even after trying so hard answered 18 Jan, 01:18 4★ganesh35 21●1 accept rate: 0%
 0 I thought 5 easy problems was a mistake. But knowing it was intentional is very disappointing @admin . Hmmm guess the golden age of codechef is over. It sucks when your rating drops when others beat you by doing the harder ones with brute force. Because not everyone is a fan of brute force. For some reason I get this feeling that you guys are doing this to get more registration to CCDSAP. I get that you need money and all but not at the cost of quality. answered 31 Jan, 10:15 4★drag 1 accept rate: 0%
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