RemoveDuplicates.java

/* (C) 2024 YourCompanyName */
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;
  }
}