LeetCode - 26. Remove Duplicates from Sorted Array

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        int len =  nums.size();
        if(len<2) return len;
        int s = 0, f = 1;
        while(f<len){
            if(nums[s]!=nums[f]){
                nums[++s] = nums[f];
            }
            f++;
        }
        return s+1;
    }
};