## How to merge arrays in alternating pattern without duplicates

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I'm currently learning in school but am unable to complete this part of the assignment. An explanation with the use of for loops would be greatly appreciated.

The numbers should be added to the merged array in an alternating pattern: first from list 1, then from list 2, then list 1 again, etc. If a number in one of the arrays already appears in the merged array, then it should be ignored, and the program should alternate to the other list again. For example, if the first list begins 1 2 3 10, and the second begins 3 4 5 8, then the merged list would begin 1 3 2 4 5 10 8.

Because the number of elements in the merged array is unknown, its size should be set to the maximum possible number of elements it should contain, and after all elements which should form the merged array appear, any remaining unfilled spaces in the array should be 0. The first 0 encountered in the array should signal the end of the "actual" elements of the array, and therefore the 0s at the end of the array should not be printed by your program.

I propose to use a `HashSet`

to remember which number you have already inserted into the array. For each number, you first check if the hash set already contains the number; if not, you add it to both the array and the set. For large inputs, this is much faster than checking the result array for each number. O(n*log(n)) or so (depending on how well the HashSet works for your input) instead of O(n^2).

**Merging elements of two different arrays alternatively in third array ,** Given two arrays arr1[] and arr2[], we need to combine two arrays in such a way that the combined array has alternate elements of both. If one array has extra� When developing software, we often need to combine data efficiently and without repetition. This often comes up when manipulating listed data with the use Arrays. If you like the easy way out, then you most likely searched on Google and downloaded a library that offers such functionality or copie

@bubble

An example using a Set is very simple - however your teacher is asking for an alternate list:

Integer[] one = new Integer[] {10,2,3,1}; Integer[] two = new Integer[] {3,8,5,4}; List<Integer> li_one = Arrays.asList(one); // First convert the arrays to a list List<Integer> li_two = Arrays.asList(two); Set<Integer> set = new HashSet<>(); set.addAll(li_one); set.addAll(li_two); System.out.println("The unique list is: " + set);

**Merge two sorted arrays,** Merge two sorted linked list without duplicates � Merge two unsorted linked lists to get a sorted list � Merge two sorted linked lists such that merged list is in reverse� Divide array in two maximum equal length arrays of similar and dissimilar elements; Check whether an Array can be made 0 by splitting and merging repeatedly; Check if an array can be formed by merging 2 non-empty permutations; Split the given array into K sub-arrays such that maximum sum of all sub arrays is minimum

A HashSet was my first idea too, but the order of storing values depends one hash values. The ... teacher likes to have alternating values which I dont like to comment - because it is a really strange request.

Following code prints: merged list is: [1, 3, 2, 4, 5, 10, 8]

int[] one = new int[] {1,2,3,10}; int[] two = new int[] {3,4,5,8}; int one_len = one.length; int two_len = two.length; List<Integer> merged = new ArrayList<>(); int oneval,twoval; for (int i = 0;i < one_len;i++) { oneval = one[i]; if (!merged.contains(oneval)) merged.add(oneval); if (i < two_len) { twoval = two[i]; if (!merged.contains(twoval)) merged.add(twoval); } } if (two_len > one_len) { for (int i = one_len; i < two_len;i++) { twoval = two[i]; if (!merged.contains(twoval)) merged.add(twoval); } } System .out.println("merged list is: " + merged);

**#47 Merging two arrays as alternative elements of third array in java ,** Merging two arrays as alternative elements of third array in java - ICSE Computer Applications Duration: 7:42
Posted: Jan 14, 2018 Merge Two Arrays in Java without the duplicate elements in it Initially, in the main () block, the first step is Besides Taking Two Arrays first of all with Given Initial Values. Calculate The lengths of Corresponding Arrays. The Syntax for calculating length :

**Solved: Assignment 6, Merge Arrays (java) Instructions In ,** Answer to Assignment 6, Merge Arrays (java) Instructions In this assignment, you all the elements which are in the two arrays but not including any duplicates. The numbers should be added to the merged array in an alternating pattern:� Get all unique values in a JavaScript array (remove duplicates) (95 answers) Closed 3 years ago . I want to push values of 3 arrays in a new array without repeating the same values

**Merge sort,** In computer science, merge sort (also commonly spelled mergesort) is an efficient, (May 2016) (Learn how and when to remove this template message) The copy back step is avoided with alternating the direction of the merge with each level of recursion Array A[] has the items to sort; array B[] is a work array. void� Merge Two Lists Without Duplicates Java. Merge Two Lists Without Duplicates Java

**Combining Arrays Without Duplicates ― Scotch.io,** When developing software, we often need to combine data efficiently and without repetition. This often comes up when manipulating listed data with the use� Copy all n1 elements of arr1 [] to arr3 [] Traverse arr2 [] and one by one insert elements (like insertion sort) of arr3 [] to arr1 []. This step take O (n1 * n2) time. We have discussed implementation of above method in Merge two sorted arrays with O (1) extra space

##### Comments

- Where are you struggling? This comes across as "do my homework for me" despite that potentially not being the case. It looks like you haven't even attempted to merge the arrays.
- @mistahenry I have edited my attempt to merge arrays but struggled with removing the duplicates.
- Thanks for the help, but I am currently learning in school and have not learned HashSet yet. Would you be able to explain how I would be able to do it with for loops?
- @Bubble In this case, just search the result array if it already contains the number... Googles
`java array contains`

to find some explanations.