//使用map
//单词计数程序
void fun1()
{
    map<string, size_t> word_count;     //string到size_t的空map
    string word;

    while(cin>>word)
        ++word_count[word];     //提取word的计数器并将其加1

    for(const auto &w : word_count)     //对map中的每个元素打印
    cout<<w.first<<" occurs "<<w.second<<((w.second > 1)?" times ": " time")<<endl;
}

//使用set
//单词计数程序，忽略常见单词"the","and","or"等
void fun2()
{
    map<string, size_t> word_count;     //string到size_t的空map
    set<string> exclude={"The","But","And","Or","An","A",
                         "the","but","and","or","an","a"};

    string word;
    while(cin>>word)
        //只统计不在exclude中的单词
        if(exclude.find(word) == exclude.end())
            ++word_count[word];     //获取并递增word的计数器

    for(const auto &w : word_count)     //对map中的每个元素打印
    cout<<w.first<<" occurs "<<w.second<<((w.second > 1)?" times ": " time")<<endl;
}