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My first implementations of Lights-Out were as, essentially, throwaway sample programs. The first C64 edition was under a kilobyte of machine code and could have just as easily been written in a screen or two of BASIC code:
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\[ds^2 = \frac{1}{y^2}\,(dx^2 + dy^2).\]。业内人士推荐PDF资料作为进阶阅读
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