题意: 要求的是所有生成树中最大边与最小边差值最小的那个. 分析: 其实可以利用最小瓶颈生成树,就是最小生成树这一性质,枚举原图的最小边,然后找相应生成树的最大边 代码: #include <iostream> #include <cstring> #include <cstdio> #include <algorithm> #include <vector> using namespace std; const int maxn=110; co…

[题意] 求一颗生成树,满足最大边和最小边之差最小 InputThe input consists of multiple datasets, followed by a line containing two zeros separated by a space.Each dataset has the following format.n ma1 b1 w1...am bm wmEvery input item in a dataset is a non-negative integer.…

题意: 规定一棵生成树的苗条度为:最大权值与最小权值之差.给出一个n个顶点m条边的图,求苗条度最小的生成树. 分析: 按照边的权值排序,枚举边集的连续区间[L, R]的左边界L,如果这些区间刚好满足一个生成树,则存在一个苗条度不超过W[R] - W[L]的生成树. 话说,代码中用了STL的vector,慢了很多. #include <cstdio> #include <vector> #include <algorithm> using namespace std; ;…

题意:给一个N(N<=100)个点的联通图(无自环和平行边),求苗条度(最大边-最小边的值)尽量小的生成树. 解法:枚举+Kruskal.先从小到大排序边,枚举选择的最小的边. 1 #include<cstdio> 2 #include<cstdlib> 3 #include<cstring> 4 #include<algorithm> 5 #include<iostream> 6 using namespace std; 7 const…

Slim Span Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 9546   Accepted: 5076 Description Given an undirected weighted graph G, you should find one of spanning trees specified as follows. The graph G is an ordered pair (V, E), where V …

题目:Slim Span UVA 1395 题意:给出一副无向有权图,求生成树中最小的苗条度(最大权值减最小权值),如果不能生成树,就输出-1: 思路:将所有的边按权值有小到大排序,然后枚举每一条边,以这条边开始利用Kruskal算法生成树,生成过程中求出权值的最大值,这个最大值减去当前枚举的边的权值就是苗条度,再动态维护一下最小苗条度就可以了. #include <iostream> #include <algorithm> #include <queue> #inc…

http://poj.org/problem?id=3522 Slim Span Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 5666   Accepted: 2965 Description Given an undirected weighted graph G, you should find one of spanning trees specified as follows. The graph G is a…

题目大意:定义无向图生成树的最大边与最小边的差为苗条度,找出苗条度最小的生成树的苗条度. 题目分析:先将所有边按权值从小到大排序,在连续区间[L,R]中的边如果能构成一棵生成树,那么这棵树一定有最小的苗条度.枚举所有这样的区间. 代码如下: # include<iostream> # include<cstdio> # include<set> # include<queue> # include<cstring> # include<al…

[Uva1395]Slim Span 题目略…… 试题分析:codevs1001舒适的路线上加一个判一下连通性就好,顺便把除改成减 代码: #include<iostream> #include<cstring> #include<cstdio> #include<algorithm> using namespace std; inline int read(){ int x=0,f=1;char c=getchar(); for(;!isdigit(c);…

Slim Span Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 7102   Accepted: 3761 Description Given an undirected weighted graph G, you should find one of spanning trees specified as follows. The graph G is an ordered pair (V, E), where V …