added some comments

src/HeightMap.cpp

@@ -90,4 +90,6 @@ void HeightMap::blur(float standard_deviation)
     free(this->data);
     this->data = blurred;
     blurred = nullptr;
-}
+}
+
+void::

src/main.cpp

@@ -42,7 +42,7 @@ std::vector<Point> produce_cellmap(HeightMap* heightmap, float z)
 std::vector<std::vector<Point>> vector_cellmap(HeightMap* heightmap, int interval)
 {
     int num_contours = (heightmap->max - heightmap->min)/interval;
-    std::vector<std::vector<Point>> vector_contours;
+    std::vector<std::vector<Point>> vector_contours; // initiating a vector of contours
     omp_set_num_threads(12);
 
     #pragma omp parallel
@@ -52,13 +52,12 @@ std::vector<std::vector<Point>> vector_cellmap(HeightMap* heightmap, int interva
         for (int i = 1; i <= num_contours; i++) 
         {
             auto points = produce_cellmap(heightmap, heightmap->min + interval*i);
-
                 
-            for (int j = 0; j < points.size(); j++){
-                Point current = points[j];
+            for (int j = 0; j < points.size(); j++){ //looping through all the points.
+                Point current = points[j]; // assigning an instance of Point class to a point.
                 //std::cout << points_allocated << " " << points.size() << "\n";
-                for (int k = 0; k < points.size(); k++){
-                    Point candidate = points[k];
+                for (int k = 0; k < points.size(); k++){ // looping through all other points.
+                    Point candidate = points[k]; 
                     if (candidate.next != nullptr) {
                         if (candidate.x +1 == current.x) {
                             current.next = &candidate;
@@ -80,7 +79,6 @@ std::vector<std::vector<Point>> vector_cellmap(HeightMap* heightmap, int interva
         #pragma omp critical
 
         vector_contours.insert(vector_contours.end(), vec_private.begin(), vec_private.end());
-
     }
         return vector_contours;
 }