Problem
A 面积
B 词频
C 不平凡的数（num）
D 西加加底漆加（C++ Primer Plus）

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开学摸底小测

Status: Done
Rule: IOI
Problem: 4
Start at: 2026-3-7 9:30
End at: 2026-3-7 11:30
Duration: 2 hour(s)
Host: Csvoner
Partic.: 21