# 2032. 至少在两个数组中出现的值

class Solution {
public:
    vector<int> twoOutOfThree(vector<int>& nums1, vector<int>& nums2, vector<int>& nums3) {
        map<int,int> m;
        set<int> n;
        for (auto num : nums1) {
            m[num] = 1;
        }
        for (auto num : nums2) {
            if (m.count(num) && m[num] == 1) n.insert(num);
            else m[num] = 2;
        }
        for (auto num : nums3) {
            if (m.count(num)) n.insert(num);
        }
        return vector<int> {n.begin(), n.end()};
    }
};