2251. Number of Flowers in Full Bloom.cpp

//.................Leetcode Hard...................//
/// 2D Array
Class Solution {
public:
    vector<int> fullBloomFlowers(vector<vector<int>>& flowers, vector<int>& people) {
      vector<int> start, end;
        for (auto& t : flowers)
            start.push_back(t[0]), end.push_back(t[1]);
        sort(start.begin(), start.end());
        sort(end.begin(), end.end());
        vector<int> res;
        for (int t : people) {
            int started = upper_bound(start.begin(), start.end(), t) - start.begin();
            int ended = lower_bound(end.begin(), end.end(), t) - end.begin();
            res.push_back(started - ended);
        }
        return res;  
    }
};