2047. 句子中的有效单词数
又是看别人代码的一天

stringstream

在#include<sstream>中

用法 1

可用于分割被空格等符号分割的字符串

#include<iostream>  
#include<sstream>
using namespace std;  

int main(){  
    string str = "hh hh hh" ;  
    stringstream a(str);  
    string s;  
    while ( a >> s ){  
        cout << s << " ";  
    }  

    return 0;
} 

// 输出 hh hh hh

用法2

不知道是啥 应该有用

#include<iostream>  
#include<sstream>
using namespace std;  

int main(){  
    stringstream s;
    s << 1;
    int n = 0;
    s >> n;
    cout << "s = " << s.str() << " " << "n = " << n;

    return 0;
} 

class Solution {
public:
    bool yeah(string s){
        int n = s.size(), cnt = 0;
        for(int i = 0; i < n; i ++ ){
            char c = s[i];
            if(isdigit(c)) return false;
            if(c == '-'){
                if(++ cnt > 1) return false;
                if(i == 0 || i == n - 1 || !islower(s[i - 1]) || !islower(s[i + 1])) return false;
            }
            if((c == '!' || c == '.' || c == ',') && i != n - 1) return false;
        }
        return true;
    }
    int countValidWords(string a) {
        int cnt = 0;
        string b;
        stringstream s(a);
        while(s >> b) cnt += yeah(b);
        return cnt;
    }
};