0070_P349_Intersection_of_Two_Arrays.cpp

/* 
Day: 70
Problem Number: 349 (https://leetcode.com/problems/intersection-of-two-arrays)
Date: 10-03-2024
Description:
Given two integer arrays nums1 and nums2, return an array of their intersection. Each element in the result must be unique and you may return the result in any order.
 
Example 1:
Input: nums1 = [1,2,2,1], nums2 = [2,2]
Output: [2]

Example 2:
Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4]
Output: [9,4]
Explanation: [4,9] is also accepted.
 
Constraints:
* 1 <= nums1.length, nums2.length <= 1000
* 0 <= nums1[i], nums2[i] <= 1000

Code:  */
class Solution {
public:
    vector<int> intersection(vector<int>& nums1, vector<int>& nums2) {
        bool s[1001];
        memset(s, false, sizeof(s));
        for (int x : nums1) {
            s[x] = true;
        }
        vector<int> ans;
        for (int x : nums2) {
            if (s[x]) {
                ans.push_back(x);
                s[x] = false;
            }
        }
        return ans;
    }
};