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Interview Question Remove Duplicates From Sorted Array

Last update: 1/31/2017 6:26:00 AM

By Fatih KABAKCI

The problem is to eliminate an array from it's duplicated elements.

Problem #26 - Remove Duplicates From Sorted Array

Description: Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.

Do not allocate extra space for another array, you must do this in place with constant memory.

For example,
Given input array nums = [1,1,2],

Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively. It doesn't matter what you leave beyond the new length.

Difficulty: Easy

Solution in Java

package com.fatihkabakci.Easy.RemoveDuplicatesfromSortedArray;

/**
 * @author fkabakci
 * Problem Description: Given a sorted array, remove the duplicates in place such that each element appear only once 
 * and return the new length.
 * 
 * Do not allocate extra space for another array, you must do this in place with constant memory.
 * 
 * For example,
 * 
 * Given input array nums = [1,1,2],
 * 
 * Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively. 
 * It doesn"t matter what you leave beyond the new length.

 * Solution: (Not the best, but simple)
 * 1. Compare adjacent two elements.
 * 2. If equals,
 * 	     then slide elements from right to left, and then decrease the length.
 * 3. Otherwise skip to the next element.
 */
public class RemoveDuplicatesfromSortedArray {
	public int removeDuplicates(int[] nums) {
		int l = nums.length, i = 0;
		while(i < l - 1)
			if(nums[i] == nums[i + 1]) {
				for(int j = i + 1; j < l - 1; j++) 
					nums[j] = nums[j + 1];
				l--;
			}else
				i++;
		return l;
	}
	public static void main(String[] args) {
		int[] nums = { 1, 1, 2 };
		System.out.println("Old: ");
		for (int n : nums)
			System.out.print(n);
		System.out.println();

		int length = new RemoveDuplicatesfromSortedArray().removeDuplicates(nums);
		System.out.println("Length: " + length);
		System.out.println("New: ");
		for (int n : nums)
			System.out.print(n);
		System.out.println();
	}
}

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