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huristic函数用Manhattan距离WA, 换成欧式距离就过了，看来h函数是需要仔细斟酌啊。。。另外其实还不是很明白，h函数用Manhattan距离计算当前点到目标的估值应该是<=实际的最优值的吧？

Posted by openthedoor at 2013-10-06 10:48:35 on Problem 2251 and last updated at 2013-10-06 10:50:02 
本打算用来练A* 的，结果卡了好久。。。求大神解释问题啊。。。
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