Oil Skimming Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 4185 Description Thanks to a certain "green" resources company, there is a new profitable industry of oil skimming. There ar…

Problem Description Thanks to a certain "green" resources company, there is a new profitable industry of oil skimming. There are large slicks of crude oil floating in the Gulf of Mexico just waiting to be scooped up by enterprising oil barons. O…

题目大意:在一个N*N的矩阵里寻找最多有多少个“##”(横着竖着都行).     题目分析:重新构图,直接以相邻的两个油井算中间算以条边,然后进行匹配,看看两两之间最多能匹配多少对. #include<stdio.h> #include<string.h> #include<algorithm> #include<iostream> #include<vector> #include<queue> #include<cmath&…

<题目链接> 题目大意: 给你一张图,图中有 '*' , '.' 两点,现在每次覆盖相邻的两个 '#' ,问最多能够覆盖几次. 解题分析: 无向图二分匹配的模板题,每个'#'点与周围四个方向的'#'建立匹配关系,然后用匈牙利跑一遍,因为匹配的两点各会进行相互匹配一次,所以最大匹配数为ans/2. #include <cstdio> #include <cstring> #include <algorithm> using namespace std; +;…

题目大意: 统计相邻(上下左右)的‘#’的对数. 解法: 与题目hdu1507 Uncle Tom's Inherited Land*类似,需要用奇偶建图.就是行+列为奇数的作为X集合,偶尔作为Y集合,都是‘#’就连边.最后求最大匹配. 数据有点大,直接建图会出错(我试过).可以按照‘#’出现的顺序给顶点编号. #include<iostream> #include<cstdio> #include<cstring> #include<queue> #inc…

Oil Skimming Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3426    Accepted Submission(s): 1432 Problem Description Thanks to a certain "green" resources company, there is a new profitabl…

Oil Skimming Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3903    Accepted Submission(s): 1616 题目链接:acm.hdu.edu.cn/showproblem.php?pid=4185 Description: Thanks to a certain "green" resou…

HDU 1241 题目大意:给定一块油田,求其连通块的数目.上下左右斜对角相邻的@属于同一个连通块. 解题思路:对每一个@进行dfs遍历并标记访问状态,一次dfs可以访问一个连通块,最后统计数量. /* HDU 1241 Oil Deposits --- 入门DFS */ #include <cstdio> int m, n; //n行m列 ][]; /* 将和i,j同处于一个连通块的字符标记出来 */ void dfs(int i, int j){ || j < || i >=…

HDU 1241  Oil Deposits L -DFS Time Limit:1000MS     Memory Limit:10000KB     64bit IO Format:%I64d & %I64u   Description The GeoSurvComp geologic survey company is responsible for detecting underground oil deposits. GeoSurvComp works with one large r…

HDU 1241 Oil Deposits(石油储藏) 00 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)   Problem Description - 题目描述 The GeoSurvComp geologic survey company is responsible for detecting underground oil deposits. GeoSurvComp works with one large…