（2022.01.30）每日一题 两句话中不常见的单词

快过年了，自己想偷个懒做个leetcode，没想到leetcode也给我们放假，上来就是一道简单题。啪一下，哈希表，存储遍历。秒杀，思路和官方题解一致，但是代码写的比官方题解垃圾多了。

直接上代码了

//mine
class Solution {
public:
    vector<string> uncommonFromSentences(string s1, string s2) {
        unordered_map<string ,int> wordCount;
        string temp;
        vector<string> res;
        //first
        for(istringstream iss(s1); iss>>temp;){
            wordCount[temp] += 1;
        }
        for(istringstream iss(s2); iss>>temp;){
            wordCount[temp] += 1;
        }
        for(auto& word : wordCount){
            if(word.second == 1){
                res.push_back(word.first);
            }
        }
        return res;
    }
};


//official
class Solution {
public:
    vector<string> uncommonFromSentences(string s1, string s2) {
        unordered_map<string, int> freq;
        
        auto insert = [&](const string& s) {
            stringstream ss(s);
            string word;
            while (ss >> word) {
                ++freq[move(word)];
            }
        };

        insert(s1);
        insert(s2);

        vector<string> ans;
        for (const auto& [word, occ]: freq) {
            if (occ == 1) {
                ans.push_back(word);
            }
        }
        return ans;
    }
}