Problem Description A group of transformers whose leader is Optimus Prime(擎天柱) were assigned a mission: to destroy all Decepticon's(霸天虎) bases. The bases are connected by roads. They must visit each base and place a bomb there. They start their missi…

dijstra求最短路径:经典应用题目: 题意:给你一个带权值无向图,权值是A点到B点的时间,然后告诉你起点,一个人可以去炸掉一个结点或多个节点,也可以派多个人,最终这些人在终点集合,问最后一个到达终点的人到达的时间: 分析:最短路中的最大值:数据不大,暴力枚举: #include <bits/stdc++.h> #define mem(a, val) memset((a), (val), sizeof a) #define all(a) (a).begin(), (a).end() #def…

http://poj.org/problem?id=2449 不会.. 百度学习.. 恩. k短路不难理解的. 结合了a_star的思想.每动一次进行一次估价,然后找最小的(此时的最短路)然后累计到k 首先我们建反向边,跑一次从汇到源的最短路,将跑出来的最短路作为估价函数h 根据f=g+h 我们将源s先走,此时实际价值g为0,估价为最短路(他们的和就是s-t的最短路) 将所有s所连的边都做相同的处理,加入到堆中(假设此时到达的点为x,那么x的g等于s到这个点的边权,因为根据最优,g+h此时是从x…

题目链接:http://poj.org/problem?id=2449 "Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly touching his little ducks' head, he told them a story. "Prince Remmarguts lives in his kingdom UDF – Unite…

http://poj.org/problem?id=2449 Remmarguts' Date Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 18168   Accepted: 4984 Description "Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly tou…

Remmarguts' Date Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 25216   Accepted: 6882 Description "Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly touching his little ducks' head, h…

Remmarguts' Date Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 33606   Accepted: 9116 Description "Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly touching his little ducks' head, h…

题意翻译 题目描述 农夫约翰正驾驶一条小艇在牛勒比海上航行． 海上有N(1≤N≤100)个岛屿,用1到N编号．约翰从1号小岛出发,最后到达N号小岛． 一张藏宝图上说,如果他的路程上经过的小岛依次出现了Ai,A2,…,AM(2≤M≤10000)这样的序列(不一定相邻),那他最终就能找到古老的宝藏． 但是,由于牛勒比海有海盗出没．约翰知道任意两个岛屿之间的航线上海盗出没的概率,他用一个危险指数Dij(0≤Dij≤100000)来描述．他希望他的寻宝活动经过的航线危险指数之和最小．那么,在找到宝藏的前…

"Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly touching his little ducks' head, he told them a story. "Prince Remmarguts lives in his kingdom UDF – United Delta of Freedom. One day their ne…

题目链接:http://poj.org/problem?id=2449 Time Limit: 4000MS Memory Limit: 65536K Description "Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly touching his little ducks' head, he told them a story. &quo…