题解 | 单词识别

#include <cctype>
#include <iostream>
#include <vector>
#include <algorithm>
#include<map>
using namespace std;

int main() {
    vector<string> v;
    string str;
    while (cin >> str) {
//将获取的字符串变成小写
        for(char & i : str)
        {
            i = tolower(i);
        }
        //获取到以句号结尾，就退出循环
        if (str[str.size() - 1] == '.') {
            str.pop_back();
            v.push_back(str);
            break;
        }
        v.push_back(str);

    }
    map<string, int> m;
    for (auto it : v) {
       m[it]++;//m默认int的初始化为0
    }
    for(auto it:m)
    {
        cout<<it.first<<":"<<it.second<<endl;
    }
}
// 64 位输出请用 printf("%lld")