26. Remove Duplicates from Sorted Array

Given nums = [1,1,2],

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 returned length.

Given nums = [0,0,1,1,1,2,2,3,3,4],

Your function should return length = 5, with the first five elements of nums being modified to 0, 1, 2, 3, and 4 respectively.

It doesn't matter what values are set beyond the returned length.

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