Problems #2020 高階競技程式設計 - Contest #1

# Name AC Ratio(user) AC (submission)
18 87.5% (42/48) 39.5% (94/238)
19 70.6% (36/51) 19.0% (56/294)
20 92.0% (46/50) 33.8% (79/234)
21 100.0% (29/29) 67.1% (53/79)
22 86.4% (38/44) 56.8% (79/139)