May 18, 2017

Sreekanth B

How to Remove Duplicates From Sorted Array Java Program

Program:

Write a program to remove duplicates from sorted array?

Description:
Given array is already sorted, and it has duplicate elements. Write a program to remove duplicate elements and return new array without any duplicate elements. The array should contain only unique elements.

Code:

package com.java2novice.algos;

public class MyDuplicateElements {

    public static int[] removeDuplicates(int[] input){
        
        int j = 0;
        int i = 1;
        //return if the array length is less than 2
        if(input.length < 2){
            return input;
        }
        while(i < input.length){
            if(input[i] == input[j]){
                i++;
            }else{
                input[++j] = input[i++];
            }   
        }
        int[] output = new int[j+1];
        for(int k=0; k<output.length; k++){
            output[k] = input[k];
        }
        
        return output;
    }
    
    public static void main(String a[]){
        int[] input1 = {2,3,6,6,8,9,10,10,10,12,12};
        int[] output = removeDuplicates(input1);
        for(int i:output){
            System.out.print(i+" ");
        }
    }
}

Output:

2 3 6 8 9 10 12

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