徐天羽
UID: 1037, Registered at 2024-9-10 15:10:10, last login at 2025-3-13 21:52:30, last active at 2025-3-23 18:41:59.
Solved 393 problems, RP: 227.32 (No. 12)
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虐题狂魔
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$$\begin{CD} A @>a>> B \\ @VbVV @AAcA \\ C @= D \end{CD} $$
