题目链接:pid=3631" style="font-size:18px">http://acm.hdu.edu.cn/showproblem.php?pid=3631 Shortest Path Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3962    Accepted Submission(s): 9…

Shortest Path Time Limit: 1000MS Memory Limit: 32768KB 64bit IO Format: %I64d & %I64u SubmitStatus Description When YY was a boy and LMY was a girl, they trained for NOI (National Olympiad in Informatics) in GD team. One day, GD team's coach, Prof. G…

floyd算法好像很奇妙的样子.可以做到每次加入一个点再以这个点为中间点去更新最短路,效率是n*n. #include<cstdio> #include<cstring> #include<cmath> #include<vector> #include<algorithm> using namespace std; ; const int INF = 0x7FFFFFFF; int A[maxn][maxn], flag[maxn]; int…

Shortest Path 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5636 Description There is a path graph G=(V,E) with n vertices. Vertices are numbered from 1 to n and there is an edge with unit length between i and i+1 (1≤i<n). To make the graph more in…

Shortest Path Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others) Total Submission(s): 1146 Accepted Submission(s): 358 Problem Description There is a path graph G=(V,E) with n vertices. Vertices are numbered from 1 to…

The Shortest Path in Nya Graph Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Problem Description This is a very easy problem, your task is just calculate el camino mas corto en un grafico, and just solo hay que camb…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5636 题解: 1.暴力枚举: #include<cmath> #include<cstdio> #include<iostream> #include<algorithm> using namespace std; typedef long long LL; ; ; int n, m; ], b[]; int main() { int T; scanf(&qu…

题意:bc round 74 分析(官方题解): 你可以选择分类讨论, 但是估计可能会写漏一些地方. 只要抽出新增边的端点作为关键点, 建立一个新图, 然后跑一遍floyd就好了. 复杂度大概O(6^2m) 注:然后我不会这种,这种floyd我觉得复杂度应该是复杂度应该是O(8^3m) 大概在千万级别,其实应该可以过,然后,其实只需要求单元最短路就行,然后是不是可以dij,然后就快一点 反正我也没写 我在比赛的时候写的是分治,考虑走不走新加的边每次走几条,以及走的顺序就好 然后全排列,时间复杂度…

题目链接  HDU5636 n个点,其中编号相邻的两个点之间都有一条长度为1的边,然后除此之外还有3条长度为1的边. m个询问,每次询问求两个点之前的最短路. 我们把这三条边的6个点两两算最短路, 然后询问的时候用这6个点的距离来更新答案就可以了. (不过听说好像有更好的方法,先占个坑) 时间复杂度$O(216m)$ #include <bits/stdc++.h> using namespace std; #define rep(i, a, b) for (int i(a); i <=…

题意:给定一个图,求从1到N的递增边权的最短路. 解法:类似于bellman-ford思想,将所有的边先按照权值排一个序,然后依次将边加入进去更新,每条边只更新一次,为了保证得到的路径是边权递增的,每次将相同权值的边全部取出来一同更新,每条边能够更新的前提是某一个端点在之前被更小的边权更新过.另外一个要注意的地方就是一次相同边的更新中,要把所有的更新暂存起来最后一起去更新,这样是为了防止同一权值的边被多次加入到路径中去. #include <iostream> #include <cst…

题目链接: Hdu 4725 The Shortest Path in Nya Graph 题目描述: 有n个点,m条边,每经过路i需要wi元.并且每一个点都有自己所在的层.一个点都乡里的层需要花费c元,问从1到N最小花费? 解题思路: 建图比较楠,刚开始的时候想到拆点,把一个点拆成两个,N+i表示点i所在层,对每个点对自己所在层建双向边,权值为0. 然后相邻层建双向边,权值为c.对w条点之间的边,正常建.但是写出来样例都GG了.发现对于同一层的点,在我建的图中可以免费来回跑,这样好像和题意有些…

HDU - 4725 The Shortest Path in Nya Graph http://acm.hdu.edu.cn/showproblem.php?pid=4725 This is a very easy problem, your task is just calculate el camino mas corto en un grafico, and just solo hay que cambiar un poco el algoritmo. If you do not und…

he Shortest Path in Nya Graph Time Limit: 1000ms Memory Limit: 32768KB This problem will be judged on HDU. Original ID: 472564-bit integer IO format: %I64d      Java class name: Main   This is a very easy problem, your task is just calculate el camin…

The Shortest Path Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3164    Accepted Submission(s): 1030 Problem Description There are N cities in the country. Each city is represent by a matrix s…

Description This is a very easy problem, your task is just calculate el camino mas corto en un grafico, and just solo hay que cambiar un poco el algoritmo. If you do not understand a word of this paragraph, just move on. The Nya graph is an undirecte…

The Shortest Path in Nya Graph Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 13445    Accepted Submission(s): 2856 Problem Description This is a very easy problem, your task is just calculate…

Shortest Path Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 627    Accepted Submission(s): 204 Problem Description There is a path graph G=(V,E) with n vertices. Vertices are numbered from 1…

The Shortest Path in Nya Graph Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 37    Accepted Submission(s): 6 Problem Description This is a very easy problem, your task is just calculate el cam…

Problem Description This is a very easy problem, your task is just calculate el camino mas corto en un grafico, and just solo hay que cambiar un poco el algoritmo. If you do not understand a word of this paragraph, just move on.The Nya graph is an un…

Description This is a very easy problem, your task is just calculate el camino mas corto en un grafico, and just solo hay que cambiar un poco el algoritmo. If you do not understand a word of this paragraph, just move on.  The Nya graph is an undirect…

The shortest path Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1507    Accepted Submission(s): 773 Problem Description There are n points on the plane, Pi(xi, yi)(1 <= i <= n), and xi < x…

The Shortest Path in Nya Graph Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 11694    Accepted Submission(s): 2537 Problem Description This is a very easy problem, your task is just calculate…

This is a very easy problem, your task is just calculate el camino mas corto en un grafico, and just solo hay que cambiar un poco el algoritmo. If you do not understand a word of this paragraph, just move on. The Nya graph is an undirected graph with…

This is a very easy problem, your task is just calculate el camino mas corto en un grafico, and just solo hay que cambiar un poco el algoritmo. If you do not understand a word of this paragraph, just move on. The Nya graph is an undirected graph with…

The Shortest Path Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2440    Accepted Submission(s): 784 Problem Description There are N cities in the country. Each city is represent by a matrix si…

The Shortest Path in Nya Graph Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 13070    Accepted Submission(s): 2794 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4725 Description: This is a ve…

The path Time Limit: 2000ms Memory Limit: 65536KB This problem will be judged on HDU. Original ID: 538564-bit integer IO format: %I64d      Java class name: Main Special Judge   You have a connected directed graph.Let d(x) be the length of the shorte…

HDU 4725 The Shortest Path in Nya Graph : http://acm.hdu.edu.cn/showproblem.php?pid=4725 题意: 在一个图中跑最短路,这个图中的每一个点都有一个等级,每次都只能向高一个等级或低一个等级的点跑.问最短的距离. 思路: 参考/kuangbin 这道题自己一开始直接按等级枚举,发现这样的复杂度是n*n的.需要更加合理的建图.考虑给每个等级建立两个点,一个用于进,一个用于出. 第i层,入边到N+2*i-1, 出边从N…

题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=1760 Given a weighted directed graph, we define the shortest path as the path who has the smallest length among all the path connecting the source vertex to the target vertex. And if two…

Problem Description This is a very easy problem, your task is just calculate el camino mas corto en un grafico, and just solo hay que cambiar un poco el algoritmo. If you do not understand a word of this paragraph, just move on.The Nya graph is an un…