Done IOI Start at: 2025-3-1 8:30 2.5 hour(s) Host:

root 34

认真比赛，独立思考很重要！

赛后总结，补题同样重要！

需要使用freopen

Status: Done
Rule: IOI
Problem: 4
Start at: 2025-3-1 8:30
End at: 2025-3-1 11:00
Duration: 2.5 hour(s)
Host: root
Partic.: 34