Intersection of Two Arrays

leetcode-349.cpp

class Solution {
public:
    vector<int> intersection(vector<int>& nums1, vector<int>& nums2) {
        unordered_set<int> uset(nums1.begin(), nums1.end());
        vector<int> res;

        for (int& num : nums2) {
            if (uset.find(num) != uset.end()) {
                res.push_back(num);
                uset.erase(num);
            }
        }
        return res;
    }
};