Find the Difference of Two Arrays

[fkdl0048]

class Solution {
public:
    vector<vector<int>> findDifference(vector<int>& nums1, vector<int>& nums2) {
        unordered_set<int> set1(nums1.begin(), nums1.end());
        unordered_set<int> set2(nums2.begin(), nums2.end());

        vector<int> onlyInNums1, onlyInNums2;

        for (int num : set1) {
            if (set2.find(num) == set2.end()) {
                onlyInNums1.push_back(num);
            }
        }

        for (int num : set2) {
            if (set1.find(num) == set1.end()) {
                onlyInNums2.push_back(num);
            }
        }

        return {onlyInNums1, onlyInNums2};
    }
};

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