26. Remove Duplicates from Sorted Array

Two pointers

class Solution {
    public int removeDuplicates(int[] nums) {
        int p1 = 0;
        for (int i = 1; i<nums.length; i++){
            if (nums[i]!=nums[i-1]){
                nums[++p1] = nums[i];
            }
        }
        return p1+1;
    }
}