map的例子

11.4 编写单词计数程序，忽略大小写和标点。例如，“example.”，“example,"和”Example“应该递增相同的计算器。

#include<iostream>
#include<map>
#include<string>
#include<algorithm>
using namespace std;

int main()
{
    map<string,size_t> word_count;
    string word;
    while(cin>>word)
    {
        word[]=tolower(word[]);
        auto f=find(word.begin(),word.end(),',');
        if(f!=word.end())
            word.erase(f);
        auto ff=find(word.begin(),word.end(),'.');
        if(ff!=word.end())
            word.erase(ff);
        ++word_count[word];
    }
    for(auto w:word_count)
        cout<<w.first<<" occurs "<<w.second<<endl;
    return ;
}

11.7定义一个map，关键字是家庭的姓，值是一个vector，保存家中孩子们的名。编写代码，实现添加新的家庭以及向已有家庭中添加新的孩子。

#include<iostream>
#include<map>
#include<string>
#include<vector>
#include<utility>
using namespace std;

int main()
{
    vector<string> student;
    map<string,vector<string>> family;
    string firstname;
    string lastname;
    /*while(cin>>lastname&&lastname!="0")
    {
        family.insert(make_pair(lastname,student));
    }*/
    while(cin>>lastname)
    {
        while(cin>>firstname&&firstname!="\n)
        family[lastname].push_back(firstname);
    }

    for(auto s:family)
    {
        cout<<s.first<<" firstname ";
        for(auto r:s.second)
            cout<<r<<" ";
        cout<<endl;
    }
     return ;
}