Do sets automatically remove duplicates?

Set does not allow duplicates and sets like LinkedHashSet maintains the order of insertion so it will remove duplicates and elements will be printed in the same order in which it is inserted. Convert the formed set into array.

geeksforgeeks.org - Remove duplicates from unsorted array using Set data structure

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Given an unsorted array of integers, print the array after removing the duplicate elements from it. We need to print distinct array elements according to their first occurrence.

Examples:

Input: arr[] = { 1, 2, 5, 1, 7, 2, 4, 2} Output: 1 2 5 7 4 Explanation: {1, 2} appear more than one time. Input: arr[] = { 3, 3, 4, 1, 1} Output: 3 4 1

Approach:

Take a Set

Insert all array element in the Set. Set does not allow duplicates and sets like LinkedHashSet maintains the order of insertion so it will remove duplicates and elements will be printed in the same order in which it is inserted.

Convert the formed set into array.

Print elements of Set.

Below is the implementation of the above approach:

C++

#include using namespace std; void removeDuplicates( int arr[], int n) { unordered_set< int > s; for ( int i = 0; i < n; i++) s.insert(arr[i]); cout << "[ " ; for ( auto x : s) cout << x << " " ; cout << "]" ; } int main() { int arr[] = { 1, 2, 5, 1, 7, 2, 4, 2 }; int n = sizeof (arr) / sizeof (arr[0]); removeDuplicates(arr, n); } Java import java.util.*; class GFG { public static void removeDuplicates( int [] arr) { LinkedHashSet set = new LinkedHashSet(); for ( int i = 0 ; i < arr.length; i++) set.add(arr[i]); System.out.print(set); } public static void main(String[] args) { int arr[] = { 1 , 2 , 5 , 1 , 7 , 2 , 4 , 2 }; removeDuplicates(arr); } } Python3 def removeDulipcates(arr): return list ( set (arr)) arr = [ 1 , 2 , 5 , 1 , 7 , 2 , 4 , 2 ] print (removeDulipcates(arr)) C# using System; using System.Collections.Generic; class GFG { public static void removeDuplicates( int [] arr) { HashSet< int > set = new HashSet< int >(); for ( int i = 0; i < arr.Length; i++) set .Add(arr[i]); foreach ( int item in set ) Console.Write(item + ", " ); } public static void Main(String[] args) { int [] arr = { 1, 2, 5, 1, 7, 2, 4, 2 }; removeDuplicates(arr); } } Javascript

Output [ 4 7 5 1 2 ]

Time Complexity: O(N)

Auxiliary Space: O(N) as using unordered_set

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en.wikipedia.org - Zoe Pound - Wikipedia

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Etymology [ edit ]

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