从前，有两条河在哥尼斯堡汇合，把城市分成四块。于是人们建造7做各具特色的桥，把哥尼斯堡连为一体。
一天又一天，脚下的桥梁出发了人们的灵感：谁能一次走完七座桥，并且不重复？
这个问题看似不难，但却没一个人能做到。因为这个图形是不能一笔画的。
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on Sunday, December 27th, 2009 at 1:55 pm and is filed under 读书笔记.
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