"Shortest" pair of paths Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 1215   Accepted: 491 Description A chemical company has an unusual shortest path problem. There are N depots (vertices) where chemicals can be stored. There ar…

传送门:http://poj.org/problem?id=1287 题意:给出n个点 m条边 ,求最小生成树的权 思路:最小生树的模板题,直接跑一遍kruskal即可 代码: #include<iostream> #include<cstdio> #include<algorithm> #include<string.h> using namespace std; const int maxn = 5005; struct node { int u; in…

题目: BIT has recently taken delivery of their new supercomputer, a 32 processor Apollo Odyssey distributed shared memory machine with a hierarchical communication subsystem. Valentine McKee's research advisor, Jack Swigert, has asked her to benchmark…

<题目链接> 题目大意:给你一棵树,然后进行q次询问,然后要你统计这q次询问中指定的两个节点最近公共祖先出现的次数. 解题分析:LCA模板题,下面用的是离线Tarjan来解决.并且为了代码的简洁,本代码用的是vector存图. #include<iostream> #include<cstdio> #include<cstring> #include<vector> using namespace std; ; vector<int>…

<题目链接> 题目大意: 给定一段序列,进行q次询问,输出每次询问区间的最大值与最小值之差. 解题分析: RMQ模板题,用ST表求解,ST表用了倍增的原理. #include <cstdio> #include <cstring> #include <cmath> #include <algorithm> using namespace std; typedef long long ll; ; int n,q; ll maxsum[M][],mi…

<题目链接> 题目大意: 给出一棵树,问任意两个点的最近公共祖先的编号. 解题分析:LCA模板题,下面用的是树上倍增求解. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> using namespace std; ; const int INF = 0x3f3f3f3f; struct Edge…

Dungeon Master Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 16748   Accepted: 6522 Description You are trapped in a 3D dungeon and need to find the quickest way out! The dungeon is composed of unit cubes which may or may not be filled…

原题传送:http://poj.org/problem?id=3461 Oulipo Time Limit: 1000MS Memory Limit: 65536K Description The French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter 'e'. He was a member of the Oulipo group. A quote from th…

给出一个n*m的图,其中m是人,H是房子,.是空地,满足人的个数等于房子数. 现在让每个人都选择一个房子住,每个人只能住一间,每一间只能住一个人. 每个人可以向4个方向移动,每移动一步需要1$,问所有人移动到房子里的最少花费. 其中,n,m<=100,最多有100个人. 最小给用流裸题. 建立一个超级源点,跟每一个房子连一条边,容量为1,花费为0 每一个人与超级汇点连一条边,容量为1,花费为0 一个房子与每一个人建一条边,房子指向人,容量为1,花费用2者的距离(不是直线距离) 然后跑最小费用流算…

题目链接:http://poj.org/problem?id=1269 Time Limit: 1000MS Memory Limit: 10000K Description We all know that a pair of distinct points on a plane defines a line and that a pair of lines on a plane will intersect in one of three ways: 1) no intersection b…