题解 | #单词识别#

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


int main(){
    string s;
    while(getline(cin,s)){
        map<string,int> counter;
            
        string::iterator pre = s.begin();
        string::iterator end = s.begin();
        while(pre!=s.end()){
            while(*end!=' '&&*end!='.') end++;
            string word = s.substr(pre-s.begin(),end-pre);
            
            transform(word.begin(),word.end(),word.begin(),::tolower);
            
            if(counter.find(word)!=counter.end()){
                counter[word]++;
            } else {
                counter[word] = 1;
            }
            if(*end=='.'){
                break;
            } else {
                end++;
                pre = end;
            }
        }
        
        map<string,int>::iterator it = counter.begin();
        while(it!=counter.end()){
            cout<<it->first<<":"<<it->second<<endl;
            it++;
        }
        
    }
    
    
    
    return 0;
}