Therefore, if the array is not sorted before using the method above, you must sort the array. Note: If the array is sorted, either of the aforementioned approaches can be utilized. Time Complexity: O(NLogN) as we are using Arrays.sort() method in our logic.Īuxiliary Space: O(1) as we are using constant space in this approach. Public static void removeDuplicates(int a, int n) We will print the entries present in the index range from i=0 to i=k-1 before returning the value of k, which is now the total number of unique elements in the array. Insert the a element to the res array.If a!=a, then change the value of a=a and k++.Since we know that the first element will always be unique, we keep a reference called k that counts down the unique elements starting at 1.Thus, we can eliminate duplicates from an array in this way. In this method, we won’t use any extra space instead, we’ll just change the provided array so that the first k elements are the unique ones and the rest are duplicates. Method 2: Removing Duplicate Elements from an Array Using Constant Extra Space Time Complexity: O(N) as we are running a loop from 0 to N where N is the number of elements present in the array.Īuxiliary Space: O(N) as we are taking an extra array “temp” of space N. creating another array for only storing Public static int removeduplicates(int a, int n) Note: When the array is sorted, this strategy is appropriate. Keep track of the distinct aspects as well. traverse the input array, copying to temp all of a’s distinctive elements where a is the original array.To hold unique elements, make a temporary array called temp.This is how the array duplicates are removed using brute force. Method 1: Removing Duplicate Elements from an Array Using Extra Space We will discuss 5 different ways to remove duplicate elements from an array. Removing duplicate elements from an array can be implemented in various ways. New size = 5 Methods for Eliminating Duplicate Elements from an Array Let’s take a look at, in this example, 2 is having a duplicate element as it is occurring more than once. What are Duplicate Elements in an Array?ĭuplicate elements are those elements that occurred in an array more then once. For ease of understanding, consider an array as a series of stairs with a value placed on each level. The goal is to group objects of the same category for storage. A collection of items stored in consecutive places in memory is known as an array.
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