zhiqiang, 7月 12, 2007 @ 3:39 下午 · Filed under 科学 · 22 条评论
今年IBM七月份的Ponder This问题（原题在这里，英文）： 一个单位正方形的土地，其内（包括边界）建一些篱笆，使得任何与正方形相交的线段都被篱笆...... 约793字，阅读全文
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