zhiqiang, 7月 10, 2007 @ 3:56 下午 · Filed under 科学 · 4 条评论
我很早之前就想过这个问题，但一直只知道一个trivial的答案。前两天无意中发现网上已经有高手给出了更好的方案，故记录在此。有兴趣的可以自己想...... 约1633字，阅读全文
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