How could this guy submit B and G2, C and G1 at the same time?

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| 2 | VivaciousAubergine | 3647 |
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| 6 | tourist | 3470 |
| 7 | Radewoosh | 3415 |
| 8 | Um_nik | 3376 |
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| # | User | Contrib. |
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| 1 | Qingyu | 162 |
| 2 | adamant | 148 |
| 3 | Um_nik | 146 |
| 4 | Dominater069 | 143 |
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| 6 | cry | 138 |
| 7 | Proof_by_QED | 136 |
| 8 | YuukiS | 135 |
| 9 | chromate00 | 134 |
| 10 | soullless | 133 |
How could this guy submit B and G2, C and G1 at the same time?

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oh, A and D also
seems suspicious
It's really even more impressive that he/she/they is able to use different code templates for all the questions in this short time period! That's how :D
I think that several people were sitting in this account and solving problems
so bad, not fair at all
It seems bro needs a specialist tag so bad.
But instead he (I mean they) got expert ;-;