Topic: Arrays

1) Remove Element

Easy

Input: nums = [0,1,2,2,3,0,4,2], val = 2
Output: 5, nums = [0,1,4,0,3,_,_,_]
Explanation: Your function should return k = 5, with the first five elements of nums containing 0, 0, 1, 3, and 4.
Note that the five elements can be returned in any order.
It does not matter what you leave beyond the returned k (hence they are underscores).

Approach

1. Sorting has to be in place

2. traverse nums using for loop, using pointer i

3. if i==val - count++ - continue

4. else - use another pointer j and assign it to nums[j++]

5. return nums.length - count

package arrays;

public class removeElement {
        public static int removeElement(int[] nums, int val) {
            int p = 0;
            int j = 0;
            for(int i=0;i<nums.length;i++){
                if(nums[i]==val){
                    p++;
                    continue;
                }
                else{
                    nums[j++]= nums[i];
                }
            }
            return nums.length-p;
        }

    public static void main(String[] args) {
            int[] nums = new int[]{0,1,2,2,3,0,4,2};
        int k = removeElement(nums, 2);
        for(int i = 0;i<k;i++){
            System.out.print(nums[i]+ "  ");
        }
    }
    }

Thank you for reading