2018-2019 ACM-ICPC, Asia Nanjing-D: Country Meow(三分)
ProblemD.CountryMeowInputfile:standardinputOutputfile:standardoutputInthe24thcentury,thereisacountrysomewhereintheuniverse,namelyCountryMeow.Duetoadvancedtechnology,peoplecaneasilytravelinthe3-dimensi