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终于想明白了。应该说，虽然没有显式的表达，三角形变换的确是做了

Posted by frkstyc at 2005-05-06 14:06:20 on Problem 1660
In Reply To:Re:假如是交点处连着表示上面，断开表示下面的话…… Posted by:uni at 2005-05-06 13:16:03 

> 哦？
> 那可能是你的程序比较强吧
> 不过你确实不能不通过三角形变换而解开
> 总之，拓扑是世界性的难题。。。即使是利用不变量之累的，那么也不可能做到完全判定
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