Problem
A 第三次
B 玄武岩
C 小雀芒
D 咖啡豆

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保山市 2025 年中小学生青奥赛选拔赛（信息学）

Status: Done
Rule: OI
Problem: 4
Start at: 2025-12-26 8:00
End at: 2025-12-26 11:30
Duration: 3.5 hour(s)
Host: jack
Partic.: 260