ARST打卡第143周[143/521]

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class Solution {
    unordered_map<string, int> m_word_count;
public:
    void splitStr2Word(string s) {
        int sz = s.size();
        int i = 0;
        string tmp;

        while (i < sz && s[i] == ' ') {
            i++;
        }

        for (; i < sz; i++) {
            if (s[i] == ' ') {
                m_word_count[tmp]++;
                tmp.clear();
            }
            else {
                tmp += s[i];
            }
        }

        if (s[sz - 1] != ' ') {
            m_word_count[tmp]++;
            tmp = ' ';
        }
    }

    vector<string> uncommonFromSentences(string s1, string s2) {
        vector<string> ans;
        splitStr2Word(s1);
        splitStr2Word(s2);
        for (auto x : m_word_count) {
            if (x.second == 1) {
                ans.push_back(x.first);
            }
        }
        return ans;
    }
};