Problem
A 弹钢琴（piano）
B 选彩笔（rgb）
C 洪水拯救计划（rescue）
D 最短路（path）

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1119

Status: Done
Rule: OI
Problem: 4
Start at: 2025-11-19 14:30
End at: 2025-11-19 17:30
Duration: 3 hour(s)
Host: kcs007
Partic.: 9