LeetCode 2956: Find Common Elements Between Two Arrays Solution

Master LeetCode problem 2956 (Find Common Elements Between Two Arrays), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2956. Find Common Elements Between Two Arrays

Easy

Array Hash Table

Problem Explanation

Explanation:

To solve this problem, we can iterate over both arrays and keep track of the elements that appear in both arrays. We can use two sets to store the unique elements of each array and then find the common elements by comparing the sets.

Algorithm:

Initialize two sets, set1 and set2.
Iterate over nums1 and add each element to set1.
Iterate over nums2 and add each element to set2.
Find the common elements by performing set intersection between set1 and set2.
Calculate answer1 as the size of the intersection of set1 and set2.
Calculate answer2 as the size of the intersection of set2 and set1.
Return [answer1, answer2].

Time Complexity:

The time complexity of this algorithm is O(n + m) where n and m are the sizes of nums1 and nums2 respectively.

Space Complexity:

The space complexity is also O(n + m) as we are using sets to store the unique elements of the arrays.

Solution Code

class Solution {
    public int[] findCommonElements(int[] nums1, int[] nums2) {
        Set<Integer> set1 = new HashSet<>();
        Set<Integer> set2 = new HashSet<>();

        for (int num : nums1) {
            set1.add(num);
        }

        for (int num : nums2) {
            set2.add(num);
        }

        Set<Integer> commonElements = new HashSet<>(set1);
        commonElements.retainAll(set2);

        int answer1 = commonElements.size();
        int answer2 = commonElements.size();

        return new int[]{answer1, answer2};
    }
}

Try It Yourself

Loading code editor...

Frequently Asked Questions

How to solve LeetCode 2956 (Find Common Elements Between Two Arrays)?

This page provides optimized solutions for LeetCode problem 2956 (Find Common Elements Between Two Arrays) in Java, C++, and Python, along with a detailed explanation and an interactive code editor to test your code.

What is the time complexity of LeetCode 2956 (Find Common Elements Between Two Arrays)?

The time complexity for LeetCode 2956 (Find Common Elements Between Two Arrays) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.

Can I run code for LeetCode 2956 on DevExCode?

Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 2956 in Java, C++, or Python.

Back to LeetCode Solutions