转载声明:原文转自:http://www.cnblogs.com/xiezie/p/5568822.html 第一次遇到迷宫搜索,给我的感觉是十分惊喜的:搞懂这个的话,感觉自己又掌握了一项技能~ 个人感觉,角色扮演类的游戏,起码都可以在迷宫搜索上找到影子. 奇偶剪枝这个算法感觉十分开阔的视野~这样去描述这个具体问题实在太形象生动了~ 总而言之,十分有趣. 仔细的人会发现  每当设计到移动,我们必须想到上下左右,这也让我们看到这类算法的思路. 在学习迷宫搜索当中,我发现:这个搜索算法是先分析 找到…

传送门: http://acm.hdu.edu.cn/showproblem.php?pid=1010 Tempter of the Bone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 144191    Accepted Submission(s): 38474 Problem Description The doggie fou…

Tempter of the Bone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 89317    Accepted Submission(s): 24279 Problem Description The doggie found a bone in an ancient maze, which fascinated him a…

题目链接:  http://acm.hdu.edu.cn/showproblem.php?pid=1010 题目大意:给定起点和终点,问刚好在t步时能否到达终点. 解题思路: 4个剪枝. ①dep>t剪枝 ②搜到一个解后剪枝 ③当前走到终点最少步数>满足条件还需要走的步数剪枝(关键) ③奇偶剪枝(关键):当前走到终点步数的奇偶性应该与满足条件还需要走的步数奇偶性一致. 其中三四两步放在一步中写:remain=abs(x-ex)+abs(y-ey)-abs(dep-t) 奇偶剪枝的原理:abs(…

Tempter of the Bone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 58766    Accepted Submission(s): 15983 Problem Description The doggie found a bone in an ancient maze, which fascinated him a…

Tempter of the Bone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 125945    Accepted Submission(s): 33969 Problem Description The doggie found a bone in an ancient maze, which fascinated him a…

剪枝是什么,简单的说就是把不可行的一些情况剪掉,例如走迷宫时运用回溯法,遇到死胡同时回溯,造成程序运行时间长.剪枝的概念,其实就跟走迷宫避开死胡同差不多.若我们把搜索的过程看成是对一棵树的遍历,那么剪枝顾名思义,就是将树中的一些“死胡同”,不能到达我们需要的解的枝条“剪”掉,以减少搜索的时间. 这里介绍一下奇偶剪枝 什么是奇偶剪枝? 部分内容来自https://blog.csdn.net/chyshnu/article/details/6171758 把矩阵看成如下形式:  0 1 0 1 0…

Tempter of the Bone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 82702    Accepted Submission(s): 22531 Problem Description The doggie found a bone in an ancient maze, which fascinated him a…

Tempter of the Bone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 92175    Accepted Submission(s): 25051 Problem Description The doggie found a bone in an ancient maze, which fascinated him a…

Tempter of the Bone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 151082    Accepted Submission(s): 40265 Problem Description The doggie found a bone in an ancient maze, which fascinated him…