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class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        if (nums.empty()) return 0;
        int ret = 1;
        vector<int> v(nums.size());
        int count = 1;
        v[0] = nums[0];
        for(int i = 1; i < nums.size(); i++) {
            if (nums[i] == nums[i-1]) {
                count++;
            } else {
                count = 1;
            }
            if (count <= 2) {
                v[ret++] = nums[i];
            }
        }
        for(int i = 0; i < ret; i++) {
            nums[i] = v[i];
        }
        return ret;
    }
};