Yesterdy i solved 3 questions on round 360 div2.After the system test also the verdict passed was fine.then after 2 hours i came to check my rating much to my dissapointment the verdict had turned to skipped and i was not there in the competition charts what had happened how to avoid this in future Note:my friend had his codeforces account logged on earlier on my laptop so when i was subbmitting problem 1 i did on his account.realising this i logged out submitted the same solution from my account and did the rest 2 from my account.did submitting from friends account then mine resulted in cheating and system declared all my submissions valid???