Problems #2020-TOI-pre

# Name
TopCoder AC Ratio (user) AC (submission)
2188 98.4% (247/251) 77.4% (352/455)
2189 70.1% (122/174) 19.9% (198/993)
2190 95.9% (117/122) 40.0% (154/385)
2191 87.5% (133/152) 22.6% (223/986)
2192 43.8% (21/48) 42.7% (88/206)