# Write Program to remove duplicate elements in an array

09 June 2022

Write Program to remove duplicate elements in an array

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# Description

Get an array as input from the user and then remove all the duplicate elements in that array.

Input

Enter the size of array

5

Enter the elements of array

35  35  45  60  60

Output

35 45 60

C Program

#include<stdio.h>

int dupRemove(int arr[], int n)

{

if (n==0 || n==1)

return n;

int temp[n];

int j = 0;

for(int i=0; i<n-1; i++)

{

if (arr[i] != arr[i+1])

temp[j++] = arr[i];

}

temp[j++] = arr[n-1];

for(int i=0; i<j; i++)

arr[i] = temp[i];

return j;

}

int main()

{

int n;

printf("Enter the size of array: ");

scanf("%d",&n);

int arr[n];

printf("Enter the elements of array: ");

for(int i=0;i<n;i++)

scanf("%d",&arr[i]);

int s = dupRemove(arr, n);

for (int i=0; i<s; i++)

printf("%d ", arr[i]);

return 0;

}

C++ Program

#include<iostream>

using namespace std;

int dupRemove(int arr[], int n)

{

if (n==0 || n==1)

return n;

int temp[n];

int j = 0;

for(int i=0; i<n-1; i++)

{

if (arr[i] != arr[i+1])

temp[j++] = arr[i];

}

temp[j++] = arr[n-1];

for(int i=0; i<j; i++)

arr[i] = temp[i];

return j;

}

int main()

{

int n;

cout<<"Enter the size of array: ";

cin>>n;

int arr[n];

cout<<"Enter the elements of array: ";

for(int i=0;i<n;i++)

cin>>arr[i];

int s = dupRemove(arr, n);

for (int i=0; i<s; i++)

cout<<arr[i]<<" ";

return 0;

}

Java Program

import java.util.Scanner;

class Main

{

static int removeDup(int arr[], int n)

{

if (n==0 || n==1)

return n;

int j = 0;

for (int i=0; i<n-1; i++)

if (arr[i] != arr[i+1])

arr[j++] = arr[i];

arr[j++] = arr[n-1];

return j;

}

public static void main (String[] args)

{

int n;

Scanner sc = new Scanner(System.in);

System.out.println("Enter the size of the array: ");

n = sc.nextInt();

int[]arr = new int[n];

System.out.println("Enter the array elements: ");

for(int i = 0; i < n; i++)

{

arr[i] = sc.nextInt();

}

int s = removeDup(arr, n);

for (int i=0; i<s; i++)

System.out.print(arr[i]+" ");

}

}

Python Program

def removeDup(arr, n):

if n == 0 or n == 1:

return n

temp = list(range(n))

j = 0;

for i in range(0, n-1):

if arr[i] != arr[i+1]:

temp[j] = arr[i]

j += 1

temp[j] = arr[n-1]

j += 1

for i in range(0, j):

arr[i] = temp[i]

return j

n = int(input("Enter size of array: "))

arr = []

print("Enter array elements: ")

for i in range(0,n):

temp = int(input())

arr.append(temp)

n = removeDup(arr, n)

for i in range(n):

print ("%d"%(arr[i]), end = " ")

If you are from 2023 batch student, Join our Telegram group for placement preparation and coming placement drive updates : https://t.me/talentbattle2023