Problem
A 考级202012-1：字符三角形
B 考级202012-2：计算算式的值
C 考级202012-3：晶晶赴约会
D 考级202012-4：角谷猜想
E 考级202012-5：求满足条件的 3 位数

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还有一级（第5轮）

Status: Done
Rule: ACM/ICPC
Problem: 5
Start at: 2023-7-27 9:30
End at: 2023-8-19 7:30
Duration: 550 hour(s)
Host: aging
Partic.: 18