During the contest, I couldn't submit the solutions for problem A and B. Codeforces said that "You have submitted the same code before" even I haven't submitted any yet. That is confusing and I have also tried to fixed the code but it appeared to pop up the same message that my code is submitted before.

This is what happened : /predownloaded/da/91/da913c743c0a6232f2bb1278a8797899bbed127a.png

As you see, there is no submissions in "My submissions" and I don't appear in the ranking also. Then I used another account to submit solutions and it's fine :D.

I want to know what's wrong with this account !!