文章作者：Tyan 部落格：noahsnail.com  |  CSDN  |  簡書

1. Description

2. Solution

• Version 1

class Solution {
public:
    vector<string> uncommonFromSentences(string A, string B) {
        vector<string> result;
        unordered_map<string, int> m;
        string s;
        for(char ch : A) {
            if(ch != ' ') {
                s += ch;
            }
            else {
                m[s]++;
                s = "";
            }
        }
        m[s]++;
        s = "";
        for(char ch : B) {
            if(ch != ' ') {
                s += ch;
            }
            else {
                m[s]++;
                s = "";
            }
        }
        m[s]++;
        for(auto pair : m) {
            if(pair.second == 1) {
                result.emplace_back(pair.first);
            }
        }
        return result;
    }
};
 

• Version 2

class Solution {
public:
    vector<string> uncommonFromSentences(string A, string B) {
        vector<string> result;
        unordered_map<string, int> m;
        istringstream strA(A);  
        string s;  
        while(strA >> s) {
            m[s]++;    
        }
        istringstream strB(B); 
        while(strB >> s) {
            m[s]++;    
        }
        for(auto pair : m) {
            if(pair.second == 1) {
                result.emplace_back(pair.first);
            }
        }
        return result;
    }
};
 

Reference