Problem
A 鸽子（pigeon）
B 排列（permutation）
C 树（tree）
D 军队（army）

According to the contest rules, you cannot view your submission details at current.

Subject: General Issue | Jury @ 2025-11-20 17:00:33

更新了，
Subject: General Issue | Jury @ 2025-11-20 15:12:15

又更新了，注意看
Subject: General Issue | Jury @ 2025-11-20 14:32:26

排行榜已更新，请至比赛主页查看

1120

Status: Done
Rule: OI
Problem: 4
Start at: 2025-11-20 14:00
End at: 2025-11-20 17:30
Duration: 3.5 hour(s)
Host: kcs007
Partic.: 48