In Codeforces Global Round 23, something happened, ksun48 accidentally submitted e1 when submitting E2 code, which caused his final score to be much lower. The following is the Q&A transcript:

Problem E1. Joking (Easy Version) *****

I accidentally resubmitted to E1 instead of E2, can you remove my submission?

Unfortunately no.

Answered by KAN

Problem E1. Joking (Easy Version) *****

I didn't mean to submit to E1 again :(

.

Answered by KAN

Problem E1. Joking (Easy Version) *****

Sad.. I had the first solve on E1 and now I have the last one

Unfortunately, the rules are the same for everyone.

Answered by 74TrAkToR

Personally, I think, in addition to players need to pay attention in the future,codeforces may need to add a new feature. For tasks with subtasks, when resubmitting, if the previous submission has passed the pretest, a pop-up window is required for secondary confirmation. But if do this, for players who really need to resubmit the code, It will take a few more seconds to confirm. If there is no subtask, I do not confirm whether it is necessary, because if it is the code of other problems, it will definitely not pass the pretest. If it is the code of the same problem, then the contestant should resubmit it after consideration?