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RemoveDuplicates.java

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package two_pointers;

/**

* Created by gouthamvidyapradhan on 04/07/2017.

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

* <p>

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

* <p>

* For example,

* Given input array nums = [1,1,2],

* <p>

* 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.

*/

public class RemoveDuplicates {

public static void main(String[] args) throws Exception {

int[] nums = {1, 1, 2};

int N = new RemoveDuplicates().removeDuplicates(nums);

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

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

}

public int removeDuplicates(int[] nums) {

if (nums.length == 1) return 1;

int size = 1;

for (int j = 0, i = 1; i < nums.length; i++) {

if (nums[i] != nums[i - 1]) {

size++;

j++;

nums[j] = nums[i];

}

}

return size;

}

}