map的例子

#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[0]=tolower(word[0]);
        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 0;
}