Problem
A 最大公约数（gcd）
B 数的变换（number）
C 回文（palindrome）
D 序列（sequence）

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1111

Status: Done
Rule: OI
Problem: 4
Start at: 2025-11-11 14:30
End at: 2025-11-11 17:18
Duration: 2.8 hour(s)
Host: kcs007
Partic.: 4