1 /** 2 * C: Dijkstra算法获取最短路径(邻接矩阵) 3 * 6 */ 7 8 #include <stdio.h> 9 #include <stdlib.h> 10 #include <malloc.h> 11 #include <string.h> 12 13 #define MAX 100 // 矩阵最大容量 14 #define INF (~(0x1<<31)) // 最大值(即0X7FFFFFFF) 15 #defin…

Prim 算法是一种解决最小生成树问题(Minimum Spanning Tree)的算法.和 Kruskal 算法类似,Prim 算法的设计也是基于贪心算法(Greedy algorithm). Prim 算法的思想很简单,一棵生成树必须连接所有的顶点,而要保持最小权重则每次选择邻接的边时要选择较小权重的边.Prim 算法看起来非常类似于单源最短路径 Dijkstra 算法,从源点出发,寻找当前的最短路径,每次比较当前可达邻接顶点中最小的一个边加入到生成树中. 例如,下面这张连通的无向图 G,…

dijkstra(最短路)和Prim(最小生成树)下的堆优化 最小堆: down(i)[向下调整]:从第k层的点i开始向下操作,第k层的点与第k+1层的点(如果有)进行值大小的判断,如果父节点的值大于子节点的值,则修改,并继续对第k+1层与第k+2层的点进行判断和修改,否则不修改,且退出.当点向下移动到树的最后一层,没有子节点供判断与修改,停止操作. 树最多有log(n) 层[log(n)=log2n,一般省略数字2],时间复杂度log(n)次. up(i)[向上调整]:同理,时间复杂度log(…

The Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of the galaxy. The Borg collective is the term used to describe the group consciousness of the Borg civilization. Each Borg individual is linked to the collective by…

Borg Maze Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8905   Accepted: 2969 Description The Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of the galaxy. The Borg collective is the term used to descr…

The Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of the galaxy. The Borg collective is the term used to describe the group consciousness of the Borg civilization. Each Borg individual is linked to the collective by…

Borg Maze Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 10554   Accepted: 3501 Description The Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of the galaxy. The Borg collective is the term used to desc…

http://poj.org/problem?id=3026 题意:任意两个字母可以连线,求把所有字母串联起来和最小. 很明显这就是一个最小生成树,不过这个题有毒.他的输入有问题.在输入m和N后面,可能有一大串的空格.就因为这个,我RE都有点懵了,要不是discuss里面有人说输入有问题,我都没注意到这个,原本只用了一个getchar吃掉最后的换行符.没想到之后还有空格.有点小坑. 思路:这个题目如果他给你一个图,那就是最裸的prim了.不过这个题的难点也就是在他给的图你不能用Prim,你只能通…

Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9718   Accepted: 3263 Description The Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of the galaxy. The Borg collective is the term used to describe the gr…

http://poj.org/problem?id=3026 Borg Maze Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 3026 Description The Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of…