Problems #2018-TOI-pre

# Name
TopCoder AC Ratio (user) AC (submission)
2051 88.9% (224/252) 40.6% (326/803)
2052 71.6% (141/197) 27.1% (214/790)
2053 88.8% (317/357) 59.2% (485/819)
2054 85.4% (187/219) 37.6% (266/708)
2055 95.9% (257/268) 72.9% (523/717)