I don't remember, but someone mentioned that there were lots of similar submissions to E1, when I looked at the suspicious submissions, they had one thing in common: memory consumed was equal to 8089600 bytes, so I ran some python and obtained these submissions(lets see how many are detected by plag-checker):

277426958,277425890,277425852,277424914,277424565,277418774,277418655,277418511,277418081,277417714,277417556,277417035,277416988,277415986,277415655,277415207,277414924,277414655,277413989,277413413,277413097,277412884,277412728,277412417 rest I am commenting due to word limit