1637. Widest Vertical Area Between Two Points Containing No Points

class Solution {
public:
    int maxWidthOfVerticalArea(vector<vector<int>>& points) {

        //take set because repeated elements give the area 0
        set<int> s; 

        //ignore the y value
        for(int i=0; i<points.size(); i++)
        {
            s.insert(points[i][0]);
        }

        int res = 0;
        int curr = INT_MIN, prev =0;

        for(auto i : s)
        {
            if(curr == INT_MIN)
            {
                curr = i;
            }
            else
            {
                prev = curr;
                curr = i;

                res = max(res, (curr - prev));
            }

        }

        return res;
    }
};