zoukankan      html  css  js  c++  java
  • HDU 1241 Oil Deposits(DFS)

    题目链接

    Problem Description
    The GeoSurvComp geologic survey company is responsible for detecting underground oil deposits. GeoSurvComp works with one large rectangular region of land at a time, and creates a grid that divides the land into numerous square plots. It then analyzes each plot separately, using sensing equipment to determine whether or not the plot contains oil. A plot containing oil is called a pocket. If two pockets are adjacent, then they are part of the same oil deposit. Oil deposits can be quite large and may contain numerous pockets. Your job is to determine how many different oil deposits are contained in a grid. 
    Input
    The input file contains one or more grids. Each grid begins with a line containing m and n, the number of rows and columns in the grid, separated by a single space. If m = 0 it signals the end of the input; otherwise 1 <= m <= 100 and 1 <= n <= 100. Following this are m lines of n characters each (not counting the end-of-line characters). Each character corresponds to one plot, and is either `*', representing the absence of oil, or `@', representing an oil pocket.
     
    Output
    For each grid, output the number of distinct oil deposits. Two different pockets are part of the same oil deposit if they are adjacent horizontally, vertically, or diagonally. An oil deposit will not contain more than 100 pockets.
     
    Sample Input
    1 1
    *
    3 5
    *@*@*
    **@**
    *@*@*
    1 8
    @@****@*
    5 5
    ****@
    *@@*@
    *@**@
    @@@*@
    @@**@
    0 0
     
    Sample Output
    0
    1
    2
    2
     
    题解:8向dfs,跟4向是一样的。
    #include <cstdio>
    #include <iostream>
    #include <string>
    #include <sstream>
    #include <cstring>
    #include <stack>
    #include <queue>
    #include <algorithm>
    #include <cmath>
    #include <map>
    #define PI 3.1415926
    #define ms(a) memset(a,0,sizeof(a))
    #define msp memset(mp,0,sizeof(mp))
    #define msv memset(vis,0,sizeof(vis))
    using namespace std;
    //#define LOCAL
    int n,m,ans;
    char mp[120][120];
    int dir[8][2]={{0,1},{0,-1},{1,0},{-1,0},{1,1},{1,-1},{-1,1},{-1,-1}};
    void dfs(int x,int y)
    {
        for(int i=0;i<8;i++)
        {
            int nx=x+dir[i][0],ny=y+dir[i][1];
            if(nx<0||ny<0||nx>=n||ny>=m)continue;
            if(mp[nx][ny]=='@')mp[nx][ny]='*',dfs(nx,ny);
        }
        return;
    }
    int main()
    {
    #ifdef LOCAL
        freopen("in.txt", "r", stdin);
    #endif // LOCAL
        ios::sync_with_stdio(false);
        while(cin>>n>>m&&n&&m)
        {
            msp,ans=0;
            for(int i=0;i<n;i++)cin>>mp[i];
            for(int i=0;i<n;i++)
            for(int j=0;j<m;j++)
            {
                if(mp[i][j]=='@')
                {
                    mp[i][j]='*';
                    ans++;
                    dfs(i,j);
                }
            }
            printf("%d
    ",ans);
        }
        return 0;
    }
  • 相关阅读:
    通过Logstash由SQLServer向Elasticsearch同步数据
    ELK +Nlog 分布式日志系统的搭建 For Windows
    Gulp 给所有静态文件引用加版本号
    Fluentdata详解
    jQuery Easy UI (适应屏幕分辨率大小)布局(Layout)
    什么是数据结构---算法
    WCF的学习之旅
    程序员必学之精华----软件工程
    译 .NET Core 3.0 发布
    Vue+Element UI 实现视频上传
  • 原文地址:https://www.cnblogs.com/gpsx/p/5180165.html
Copyright © 2011-2022 走看看