Problem
A 数数（count）
B 中位数（median）
C 异或（xor）
D 商店（shop）

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第三场

Status: Done
Rule: IOI
Problem: 4
Start at: 2024-9-12 14:00
End at: 2024-9-12 17:30
Duration: 3.5 hour(s)
Host: root
Partic.: 19