message: Update count-number-of-rectangles-containing-each-point.cpp
diff: class Solution {
  public:
  vector<int> countRectangles(vector<vector<int>>& rectangles, vector<vector<int>>& points) {
  - int max_y = (*max_element(cbegin(rectangles), cend(rectangles),
  + const auto max_y = (*max_element(cbegin(rectangles), cend(rectangles),
  [](const auto& a, const auto& b) {
  return a[1] < b[1];
  }))[1];
  