leetcode/350.cpp at dev · xcheng85/leetcode · GitHub

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class Solution {
public:
    vector<int> intersect(vector<int>& nums1, vector<int>& nums2) {
        unordered_map<int, int> dict;
        vector<int> res;
        for(int i = 0; i < (int)nums1.size(); i++) dict[nums1[i]]++;
        for(int i = 0; i < (int)nums2.size(); i++)
            if(--dict[nums2[i]] >= 0) res.push_back(nums2[i]);
        return res;
    }
};

class Solution {
public:
    vector<int> intersect(vector<int>& nums1, vector<int>& nums2) {
        sort(nums1.begin(), nums1.end());
        sort(nums2.begin(), nums2.end());

        int n1 = (int)nums1.size(), n2 = (int)nums2.size();
        int i1 = 0, i2 = 0;

        vector<int> res;

        while(i1 < n1 && i2 < n2){
            if(nums1[i1] == nums2[i2]) {
                res.push_back(nums1[i1]);
                i1++;
                i2++;
            }
            else if(nums1[i1] > nums2[i2]){
                i2++;
            }
            else{
                i1++;
            }
        }
        return res;
    }
};