class Solution {
public:
    int maxWidthOfVerticalArea(vector<vector<int>>& points) {
        int len = points.size();
        vector<int> arr(len);
        for (int i = 0; i < len; i++)
            arr[i] = points[i][0];
        sort(arr.begin(), arr.end());
        int ret = INT_MIN;
        for (int i = 1; i < len; i++) {
            if (arr[i] - arr[i-1] > ret) ret = arr[i] - arr[i-1];
        }
        return ret;
    }
};