Rescue Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 19985    Accepted Submission(s): 7110 Problem Description Angel was caught by the MOLIGPY! He was put in prison by Moligpy. The prison is d…

题目传送门 题意:从r走到a,遇到x多走一步,问最小走到a的步数 分析:因为r有多个,反过来想从a走到某个r的最小步数,简单的BFS.我对这题有特殊的感情,去年刚来集训队时肉鸽推荐了这题,当时什么都不会,看个数组模拟队列的BFS看的头晕,现在看起来也不过如此,额,当年开始是从r走到a的,因为数据巨弱才过的,应该要用到优先队列. /************************************************ * Author :Running_Time * Created Ti…

BFS+优先级队列. #include <iostream> #include <cstdio> #include <cstring> #include <queue> using namespace std; #define MAXNUM 205 typedef struct node_st { int x, y ,t; node_st() {} node_st(int xx, int yy, int tt) { x = xx; y = yy; t = t…

Problem Description Angel was caught by the MOLIGPY! He was put in prison by Moligpy. The prison is described as a N * M (N, M <= 200) matrix. There are WALLs, ROADs, and GUARDs in the prison. Angel's friends want to save Angel. Their task is: approa…

题目链接:hdu 1242 这题也是迷宫类搜索,题意说的是 'a' 表示被拯救的人,'r' 表示搜救者(注意可能有多个),'.' 表示道路(耗费一单位时间通过),'#' 表示墙壁,'x' 代表警卫(耗费两个单位时间通过),然后求出 'r' 能找到 'a' 的最短时间,找不到输出 "…………"(竟然在这里也 wa 了一发 -.-||).很明显是广搜了,因为 'r' 可能有多个,所以我们反过来从 'a' 开始搜,每次搜到 'r' 都更新最小时间值(很重要的一个转换!).可是这题因为通过 '…

Problem Description Today is Ignatius' birthday. He invites a lot of friends. Now it's dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the friends know each other, and all the friends do not want…

Rescue Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other) Total Submission(s) : 14   Accepted Submission(s) : 7 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description Angel was caught by the MOLIGPY…

http://acm.hdu.edu.cn/showproblem.php?pid=1242 感觉题目没有表述清楚,angel的朋友应该不一定只有一个,那么正解就是a去搜索r,再用普通的bfs就能过了. 但是别人说要用优先队列来保证时间最优,我倒是没明白,步数最优跟时间最优不是等价的吗?就算士兵要花费额外时间,可是既然先到了目标点那时间不也一定是最小的? 当然用优先队列+ a去搜索r是最稳妥的. #include <cstdio> #include <cstring> #inclu…

Rescue Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 12441 Accepted Submission(s): 4551 Problem Description Angel was caught by the MOLIGPY! He was put in prison by Moligpy. The prison is descri…

此刻再看优先队列,不像刚接触时的那般迷茫!这也许就是集训的成果吧! 加油!!!优先队列必须要搞定的! 这道题意很简单!自己定义优先级别! +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ =================================================================================== +++++++++++++…