Hello everybody, this time I just want to share the situation that I lived yesterday during the round 422. I like math problems, so I decided to start solving problem D(I solved the problem and got pretest passed with 1430 ~ 1450 ms(I don't remember exactly) since I submitted an nlogn solution). Well, at that moment, I was aware that the final verdict in the System Test could be TLE, however, my [solution during the contest] (http://codeforces.com/contest/822/submission/28218746) should take the same time for any input since I precomputed the value of the prefix sums and, right after that, the output can be found substracting and multiplying some variables. ↵
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Thus, I thought that if that solution had passed pretest, it must pass the SysTest as well(even when it was slow). Okay, after some time, the contest ended and the SysTest started. I was waiting for my submission for problem D and I noticed that, on the status page, my submission got TLE on test 1 and suddenly, it disappeared from the [standings](http://codeforces.com/contest/822/standings/participant/12843150#p12843150). As you can see, it seems that I never submitted any solution for D. ↵
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At that moment, I was a bit confused by the situtation and I sent messages to the author contest [user:melnik,2017-07-03] and to the coordinators of the contest. Well, after some time, the ratings were updated D: and I didn't receive any answer from them. After some more minutes, [user:melnik,2017-07-03] replied to my message. He explained that it was unexpected and he was really sorry about it(I understand that there are always some issues during any contest). ↵
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I decided to forget that situation yesterday. Today, with a better mood, I decided to submit exactly the same solution again(was it really TLE on test 1? Hahaha) and the result was [this](http://codeforces.com/contest/822/submission/28259314) (The answer was: Not, it seems it was not TLE on test1).↵
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It turned out to be really sad because I would rank around 20 — 30(and I would have recovered my violet color) instead of ranking 420 :D and decrease my rating by 30. Moreover, according to the [Editorial](http://codeforces.com/blog/entry/53068) the first submission for D in Div2 was after 18 minutes while mine was in 17 minutes. Totally sad. ↵
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Okay, that was my sad story(maybe in some other contest I can still recover my violet color) and as [user:diversity,2017-07-03] pointed out, I was relying on my luck too much. ↵
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However, currently, I ask the same thing that [user:utsav.delhi2,2017-07-03] asked in the comments. Why does Codeforces run our code against pretest again?↵
For instance, if they had run my solution against the first official test(those that don't belong to the pretest), this situtation wouldn't have occurred. ↵
I think that the answer to this question can be something technical that almost doesn't mind in competitive programming, but I would like to read some answer just to feel a bit better.↵
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Thus, I thought that if that solution had passed pretest, it must pass the SysTest as well(even when it was slow). Okay, after some time, the contest ended and the SysTest started. I was waiting for my submission for problem D and I noticed that, on the status page, my submission got TLE on test 1 and suddenly, it disappeared from the [standings](http://codeforces.com/contest/822/standings/participant/12843150#p12843150). As you can see, it seems that I never submitted any solution for D. ↵
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At that moment, I was a bit confused by the situtation and I sent messages to the author contest [user:melnik,2017-07-03] and to the coordinators of the contest. Well, after some time, the ratings were updated D: and I didn't receive any answer from them. After some more minutes, [user:melnik,2017-07-03] replied to my message. He explained that it was unexpected and he was really sorry about it(I understand that there are always some issues during any contest). ↵
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I decided to forget that situation yesterday. Today, with a better mood, I decided to submit exactly the same solution again(was it really TLE on test 1? Hahaha) and the result was [this](http://codeforces.com/contest/822/submission/28259314) (The answer was: No
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It turned out to be really sad because I would rank around 20 — 30(and I would have recovered my violet color) instead of ranking 420 :D and decrease my rating by 30. Moreover, according to the [Editorial](http://codeforces.com/blog/entry/53068) the first submission for D in Div2 was after 18 minutes while mine was in 17 minutes. Totally sad. ↵
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Okay, that was my sad story(maybe in some other contest I can still recover my violet color) and as [user:diversity,2017-07-03] pointed out, I was relying on my luck too much. ↵
↵
However, currently, I ask the same thing that [user:utsav.delhi2,2017-07-03] asked in the comments. Why does Codeforces run our code against pretest again?↵
For instance, if they had run my solution against the first official test(those that don't belong to the pretest), this situtation wouldn't have occurred. ↵
I think that the answer to this question can be something technical that almost doesn't mind in competitive programming, but I would like to read some answer just to feel a bit better.↵
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