#include <unordered_map>
#include <vector>
class Solution {
public:
    /**
     * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
     *
     * 
     * @param array int整型vector 
     * @return int整型vector
     */
    vector<int> FindNumsAppearOnce(vector<int>& array) {
        // write code here
        unordered_map<int, int> m;
        for(int i = 0;i<array.size();++i)
        {
            m[array[i]]++;
        }
        vector<int> res;
        for(auto beg = m.begin();beg != m.end();++beg)
        {
            if(beg->second == 1)
                res.push_back(beg->first);
            if(res.size() == 2)
            {
                if(res[0] > res[1])
                    swap(res[0],res[1]);
                break;
            }
        }
        return res;
    }
};

思路:哈希表