UVA Knight Moves

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题目例如以下: Knight Moves A friend of you is doing research on the Traveling Knight Problem (TKP) where you are to find the shortest closed tour of knight moves that visits each square of a given set of n squares on a chessboard exactly once. He thinks t…

UVA 439 Knight Moves(BFS)

Knight Moves option=com_onlinejudge&Itemid=8&category=11&page=show_problem&problem=380" target="_blank" style="text-decoration:none">From:UVA, 439 Time Limit: 3000 MS A friend of you is doing research on the Tra…

UVA 439 Knight Moves --DFS or BFS

简单搜索,我这里用的是dfs,由于棋盘只有8x8这么大,于是想到dfs应该可以过,后来由于边界的问题,TLE了,改了边界才AC. 这道题的收获就是知道了有些时候dfs没有特定的边界的时候要自己设置一个合适的边界.这题推导可知,任意两点之间马踩6步之内一定能够到达,6步之内还未搜到说明绝对不是最优结果,果断退出.所以这里的res开始时最小设定为6即可,随着设的res的增大,运行时间越来越多,因为深搜可以有很多的分支,不采取较小的边界的话,可能会浪费很多时间在无用的搜索上,所以需要如此剪枝. 反复提…

UVA 439 Knight Moves

// 题意:输入标准国际象棋棋盘上的两个格子,求马最少需要多少步从起点跳到终点 BFS求最短路: bfs并维护距离状态cnt, vis记录是否访问过 #include<cstdio> #include<cstring> #include<iostream> #include<string> #include<algorithm> #include<queue> using namespace std; int r1, c1, r2…

【UVa】439 Knight Moves（dfs）

题目题目分析没有估价函数的IDA...... 代码 #include <cstdio> #include <cstring> #include <algorithm> using namespace std; int q,dx[10]={2,2,-2,-2,1,-1,1,-1},dy[10]={1,-1,1,-1,2,2,-2,-2},ans=1<<15; bool vis[11][11]; int x1,y1,x2,y2; bool…

uva 439 Knight Moves 骑士移动

这道题曾经写过,bfs.用队列,不多说了,上代码: #include<stdio.h> #include<stdlib.h> #include<string.h> #include<queue> using namespace std; int map[10][10]; int visit[10][10]; int dist[10][10]; int dx[8]={-2,-2,-1,-1,1,1,2,2}; int dy[8]={-1,1,-2,2,-2,2…

Knight Moves UVA - 439

A friend of you is doing research on the Traveling Knight Problem (TKP) where you are to find the shortest closed tour of knight moves that visits each square of a given set of n squares on a chessboard exactly once. He thinks that the most difficult…