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