用i控制行，j来控制列，根据i+j的和的变化来控制输出黑方格，还是白方格。

c5.cpp
Debug\c5.exe
.....\c5.ilk
.....\c5.obj
.....\c5.pch
.....\c5.pdb
.....\vc60.idb
.....\vc60.pdb
c5.dsp
c5.ncb
c5.plg
c5.dsw
c5.opt
说明.txt
Debug

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