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注意

Posted by 00348216 at 2004-10-15 20:36:21 on Problem 1230 
这道题关键可能在于输入的墙的坐标可能起点比终点大
比如 本来是2 0 4 0
但是它输入的却是4 0 2 0
弄了半天才发现 真郁闷！！！
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