Type: Default 60000ms 256MiB

十二

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Description

H.比较喜欢12这个数字 请你计算从1(包含)到2024(包含)有多少数字包含"12"。 例如12包含"12",121包含"12",1200包含"12" 但是102不包含"12",21不包含"12"等。

Format

Input

Output

一个整数(直接输出答案以验证正确与否)

2025-10-25-课堂循环结构

Not Attended
Status
Done
Rule
XCPC
Problem
4
Start at
2025-10-25 11:15
End at
2025-10-25 13:15
Duration
2 hour(s)
Host
Partic.
43