How do you find the common element of two arrays?

Approach :

1. Get the two Arrays.
2. Create two hashsets and add elements from arrays tp those sets.
3. Find the common elements in both the sets using Collection. retainAll() method. This method keeps only the common elements of both Collection in Collection1.
4. Set 1 now contains the common elements only.

How do you find the median of two arrays?

Median of two sorted arrays of different sizes

1. Case 1: m+n is odd, the median is at (m+n)/2 th index in the array obtained after merging both the arrays.
2. Case 2: m+n is even, the median will be average of elements at index ((m+n)/2 – 1) and (m+n)/2 in the array obtained after merging both the arrays.

What is the time complexity of a program that takes two arrays arr1 N and arr2 M representing integers and returns an integer representing their product?

Time complexity of this method is O(mn) for both operations. Here m and n are number of elements in arr1[] and arr2[] respectively.

How do you find the intersection of two arrays?

Algorithm for Intersection of Two Arrays Calculate the frequency of every element in both the arrays and select the common part, which represents the intersection of two arrays. Frequency of 1 in arr1 is 2 and of 2 in arr1 is 2. The frequency of 2 in arr2 is 2.

What are the common elements of the periodic table?

Common Elements

aluminum	Al	oxygen
calcium	Ca	strontium
carbon	C	sulfur
chlorine	Cl	tin
chromium	Cr	uranium

What is median of an array?

Median of a sorted array of size n is defined as the middle element when n is odd and average of middle two elements when n is even.

How do you find the common elements in two arrays in CPP?

Find Common Elements between Two Arrays

1. First, all the 10 elements are received and stored in array arr1[]
2. Second, all the 10 elements are received and stored in array arr2[]
3. Now I’ve compared the element at very first (or 0th) index in arr1[] with each and every elements of second array, that is arr2[]

What is Mo algorithm?

Mo’s algorithm is a generic idea. It applies to the following class of problems: You are given array Arr of length N and Q queries. Each query is represented by two numbers L and R, and it asks you to compute some function Func with subarray Arr[L..

How do you find the common elements in two arrays in C++?

To find union of two sorted arrays, follow the following merge procedure :

1. Use two index variables i and j, initial values i = 0, j = 0.
2. If arr1[i] is smaller than arr2[j] then print arr1[i] and increment i.
3. If arr1[i] is greater than arr2[j] then print arr2[j] and increment j.

What is an intersection of two sets?

The intersection of two or more given sets is the set of elements that are common to each of the given sets. The intersection of sets is denoted by the symbol ‘∩’. In the case of independent events, we generally use the multiplication rule, P(A ∩ B) = P( A )P( B ).

What are the common elements and their uses?

	ELEMENT	USES
1)	Aluminum	A light metal used in making airplanes, buildings, pots & pans, etc.
2)	Bromine	Used in photography, medicines, insecticides, etc.
3)	Calcium	A soft, metallic chemical element found in limestone, marble, chalk, etc.
4)	Carbon	Found in coal, oil gas, living things, & inks

What is the difference between the largest and middle-sized arrays?

In the worst case, the largest sized array may have all small elements and middle-sized array has all middle elements. The approach used above works well if the arrays does not contain duplicate values however it can fail in cases where the array elements are repeated. This can lead to a single common element to get printed multiple times.

What is the space complexity of sorting an array?

Time Complexity: Sorting array B [] + Searching for all elements of A [] in B [] = O (nlogn) + O (mlogn) = O (nlogn + mlogn) Space Complexity: If we use merge sort, then space complexity is O (n), else if we use heap sort, space complexity is O (1). Critical ideas to think! Here, we sorted the smaller array.

How to sort an array using nlogn time complexity?

1. Sort both the arrays A and B, this will take O(nlogn) time complexity. 2. Take two pointers i and j, initialize both of them to 0. we will use i for array A and j for B. 3. Create a result array res of size n. 4.

How to find the common elements between two arrays in Java?

Given two arrays and our task is to find their common elements. Get the two java Arrays. Iterate through each and every element of the arrays one by one and check whether they are common in both. Add each common element in the set for unique entries. By using the retainAll () method of the HashSet we can find the common elements between two arrays.