Problem
A 考级202006-1：鸡尾酒疗法
B 考级202006-2：判断是否存在重复的数
C 考级202006-3：日期输出
D 考级202006-4：计算表达式的值
E 考级202006-5：与指定数字相同的数的个数

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一级第6轮

Status: Done
Rule: ACM/ICPC
Problem: 5
Start at: 2023-7-28 9:30
End at: 2023-8-19 1:30
Duration: 520 hour(s)
Host: aging
Partic.: 16