[ACM] ZOJ 3209 Treasure Map ( Dancing Links 精确覆盖,矩形覆盖)
TreasureMapTimeLimit:2SecondsMemoryLimit:32768KBYourbossoncehadgotmanycopiesofatreasuremap.Unfortunately,allthecopiesarenowbrokentomanyrectangularpieces,andwhatmakeitworse,hehaslostsomeofthepieces.Luc