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…

https://www.luogu.org/problem/show?pid=2910 题目描述 Farmer John is on a boat seeking fabled treasure on one of the N (1 <= N <= 100) islands conveniently labeled 1..N in the Cowribbean Sea. The treasure map tells him that he must travel through a certa…

P2910 [USACO08OPEN]寻宝之路Clear And Present Danger 题目描述 Farmer John is on a boat seeking fabled treasure on one of the N (1 <= N <= 100) islands conveniently labeled 1..N in the Cowribbean Sea. The treasure map tells him that he must travel through a c…

题目描述 Farmer John is on a boat seeking fabled treasure on one of the N (1 <= N <= 100) islands conveniently labeled 1..N in the Cowribbean Sea. The treasure map tells him that he must travel through a certain sequence A_1, A_2, ..., A_M of M (2 <=…

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,在找到宝藏的前提下,这个…

说起来这还是本蒟蒻学完Floyd之后做的第一道题. emm...这是一道裸题,题目大致是说有一堆岛,岛之间有海盗,因此每一条边都有一个危险指数(权重),然后给出一段必须经过的路线,求从一号小岛走到N号小岛最小的危险指数是多少. 先介绍一下Floyd算法吧: Floyd(弗洛伊德)算法是用来求解带权图(无论正负)中的多源最短路问题.算法的原理是动态规划. 用dist(i,j,k)表示从顶点i到顶点j只经过前k个顶点的最短路的长度.那么只有如下两种情况 1.i,j之间的最短路不经过k+1,dist(…

题目描述 Farmer John is on a boat seeking fabled treasure on one of the N (1 <= N <= 100) islands conveniently labeled 1..N in the Cowribbean Sea. The treasure map tells him that he must travel through a certain sequence A_1, A_2, ..., A_M of M (2 <=…

OJ题号:洛谷2910 思路:Floyd #include<cstdio> #include<algorithm> using namespace std; int main() { int n,m; scanf("%d%d",&n,&m); int a[m]; ;i<m;i++) scanf("%d",&a[i]); ][n+]; ;i<=n;i++) { ;j<=n;j++) { scanf(&q…

1624: [Usaco2008 Open] Clear And Present Danger 寻宝之路 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 502  Solved: 341[Submit][Status][Discuss] Description     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…

直接floyd.. ----------------------------------------------------------------------- #include<cstdio> #include<cstring> #include<algorithm> #include<iostream> #include<vector>   #define rep( i , n ) for( int i = 0 ; i < n ; +…