zoukankan      html  css  js  c++  java
  • Virtual Friends (HDU3172)

    题目链接 http://acm.hdu.edu.cn/showproblem.php?pid=3172

    Virtual Friends

    Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
    Total Submission(s): 9227    Accepted Submission(s): 2669


    Problem Description
    These days, you can do all sorts of things online. For example, you can use various websites to make virtual friends. For some people, growing their social network (their friends, their friends' friends, their friends' friends' friends, and so on), has become an addictive hobby. Just as some people collect stamps, other people collect virtual friends. 

    Your task is to observe the interactions on such a website and keep track of the size of each person's network. 

    Assume that every friendship is mutual. If Fred is Barney's friend, then Barney is also Fred's friend.
    Input
    Input file contains multiple test cases. 
    The first line of each case indicates the number of test friendship nest.
    each friendship nest begins with a line containing an integer F, the number of friendships formed in this frindship nest, which is no more than 100 000. Each of the following F lines contains the names of two people who have just become friends, separated by a space. A name is a string of 1 to 20 letters (uppercase or lowercase).
    Output
    Whenever a friendship is formed, print a line containing one integer, the number of people in the social network of the two people who have just become friends.
    Sample Input
    1 3 Fred Barney Barney Betty Betty Wilma
    Sample Output
    2 3 4
    Source
     

    注意此题多组数据,跟正常多的多组数据不同

    AC代码:
    #include<cstdio>
    #include<iostream>
    #include<map>
    #include<cstring>
    using namespace std;
    const int maxn= 110000;
    int pre[maxn],num[maxn];
    char name1[30],name2[30];
    string str1,str2;
    map<string,int> mmap;
    int find(int x)
    {
        int r=x;
        while(r!=pre[r])
            r=pre[r];
        int i=x,j;
        while(pre[i]!=r)
        {
            j=pre[i];
            pre[i]=r;
            i=j;
        }
    
        return r;
    }
    void join(int x,int y)
    {
        int fx=find(x),fy=find(y);
        if(fx!=fy)
        {
            pre[fx]=fy;
            num[fy]+=num[fx];
            num[fx]=0;
    
        }
        printf("%d
    ",num[fy]);   ///每次都要输出
    }
    
    int main()
    {
        int t,n;
        while(~scanf("%d",&t))    ///多组数据
        {
            while(t--)
            {
                mmap.clear();
                scanf("%d",&n);
                for(int i=1; i<maxn; i++)
                    pre[i]=i,num[i]=1;
                int no=1;
                while(n--)
                {
                    scanf("%s%s",name1,name2);
                    str1=name1;
                    str2=name2;
                    if(mmap.find(str1)==mmap.end()&&mmap.find(str2)!=mmap.end())
                    {
                        mmap[str1]=no++;
                        join(mmap[str1],mmap[str2]);
    
                    }
                    else if(mmap.find(str2)==mmap.end()&&mmap.find(str1)!=mmap.end())
                    {
                        mmap[str2]=no++;
                        join(mmap[str1],mmap[str2]);
    
                    }
                    else if(mmap.find(str2)==mmap.end()&&mmap.find(str1)==mmap.end())
                    {
                        mmap[str1]=no++;
                        mmap[str2]=no++;
                        join(mmap[str1],mmap[str2]);
    
    
                    }
                    else if(mmap.find(str2)!=mmap.end()&&mmap.find(str1)!=mmap.end())
                    {
                        join(mmap[str1],mmap[str2]);
    
                    }
    
    
    
                }
    
            }
        }
    
    
        return 0;
    }
  • 相关阅读:
    JAVA识别字符串是数字(英文)还是汉字,web页面进行字符截断的帮助类
    linux不解压超大日志gz包直接查找特定内容
    Caffe学习系列(11):图像数据转换成db(leveldb/lmdb)文件
    Caffe学习系列(10):命令行解析
    Caffe学习系列(9):运行caffe自带的两个简单例子
    Caffe学习系列(8):solver优化方法
    Caffe学习系列(7):solver及其配置
    Caffe学习系列(6):Blob,Layer and Net以及对应配置文件的编写
    Caffe学习系列(5):其它常用层及参数
    Caffe学习系列(4):激活层(Activiation Layers)及参数
  • 原文地址:https://www.cnblogs.com/longl/p/7281254.html
Copyright © 2011-2022 走看看