LeetCode 26. Remove Duplicates from Sorted Array

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        int n = nums.size();
        if (n == 0) return 0;
        int i = 0;
        for (int j = 1; j < n; ++j)
            if (nums[i] != nums[j])
                nums[++i] = nums[j];
        return i + 1;
    }
};