Untitled

import java.util.Arrays;
import java.util.Scanner;

public class RemoveFromSortedArray {

    /**
     *This class Takes an integer array nums sorted in non-decreasing order, remove all duplicates in-place so that each unique element appears only once.
     * Return the number of unique elements in the array.
     * If the number of unique elements be k, then,
     * Change the array nums such that the first k elements of nums contain the unique values in the order that they were present originally.
     * The remaining elements, as well as the size of the array does not matter in terms of correctness.
     * The driver code will assess correctness by printing and checking only the first k elements of the modified array.
     * An array sorted in non-decreasing order is an array where every element to the right of an element is either equal to or greater in value than that element.
     *
     *
     * Examples:
     * Input: nums = [0, 0, 3, 3, 5, 6]
     * Output: 4
     * Explanation:
     * Resulting array = [0, 3, 5, 6, _, _]
     * There are 4 distinct elements in nums and the elements marked as _ can have any value.
     *
     * Input: nums = [-2, 2, 4, 4, 4, 4, 5, 5]
     * Output: 4
     * Explanation
     * Resulting array = [-2, 2, 4, 5, _, _, _, _]
     * There are 4 distinct elements in nums and the elements marked as _ can have any value.
     */

    public static int removeDuplicatesFormStortedArray(int[] nums){

        int size = 0;

        for (int i = 0; i < nums.length -1; i++) {
            if (nums[i] != nums[i+1]){
                nums[size++] = nums[i];
            }
        }
        nums[size++] = nums[nums.length-1];
        return size;
    }

    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);
        System.out.print("ENTER THE SIZE OF ARRAY -> ");
        int size = s.nextInt();

        System.out.println("ENTER ARRAY ELEMENTS -> ");
        int [] arr = new int [size];

        for (int i = 0; i < size; i++){
            arr[i] = s.nextInt();
        }

        System.out.println((removeDuplicatesFormStortedArray(arr)));
    }
}