Problem
A 俄罗斯轮盘赌
B 蒙德里安的梦想
C 土拨鼠玩炉石
D 麦森数（超级难！！）
E 1+2+3+...+n==?mod2???

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普通困难比赛

Status: Done
Rule: Ledo
Problem: 5
Start at: 2023-5-13 10:19
End at: 2025-8-23 18:19
Duration: 20000 hour(s)
Host: 杜俊睿
Partic.: 18