poj 1096 & zoj 1063 Space Station Shielding (搜索 floodfill )
SpaceStationShieldingTimeLimit:1000MSMemoryLimit:65536KTotalSubmissions:1342Accepted:477DescriptionRogerWilcoisinchargeofthedesignofaloworbitingspacestationfortheplanetMars.Tosimplifyconstruction,thes