Done IOI Start at: 2026-1-10 13:30 3.5 hour(s) Host:

kcs007 18

注意freopen，认真做

Status: Done
Rule: IOI
Problem: 4
Start at: 2026-1-10 13:30
End at: 2026-1-10 17:00
Duration: 3.5 hour(s)
Host: kcs007
Partic.: 18