Leetcode 26. Remove Duplicates from Sorted Array

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

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