背包问题
........\Debug
........\.....\bag.exe
........\.....\bag.ilk
........\.....\bag.obj
........\.....\bag.pch
........\.....\bag.pdb
........\.....\vc60.idb
........\.....\vc60.pdb
........\bag.cpp
........\bag.dsp
........\bag.dsw
........\bag.exe
........\bag.ncb
........\bag.opt
........\bag.plg