Add simple testing script to main

We were using max_element twice

Makefile

@@ -1,10 +1,10 @@
 CXX = g++
 CXXFLAGS = -Wall -O3
 
-program: main.o
-	$(CXX) $(CXXFLAGS) -o program.out main.o
+kdtree: main.o
+	$(CXX) $(CXXFLAGS) -o kdtree.out main.o
 
-main.o: main.cpp
+main.o: main.cpp kdtree.h
 	$(CXX) $(CXXFLAGS) -c main.cpp
 
 clean :

kdtree.h

@@ -74,7 +74,7 @@ class KDTree {
             // Get extent along this axis
             auto comparator = get_point_comparator(it_axis);
 
-            Point *min = *std::max_element(points.begin(), points.end(), comparator);
+            Point *min = *std::min_element(points.begin(), points.end(), comparator);
             Point *max = *std::max_element(points.begin(), points.end(), comparator);
 
             float extent = max->coordinates[it_axis] - min->coordinates[it_axis];
@@ -98,7 +98,7 @@ class KDTree {
 
         // TODO: This copies. Can we split the vector into two without copying?
         std::vector<Point *> left_of_median(points.begin(), points.begin() + middle);
-        std::vector<Point *> right_of_median(points.begin() + middle, points.end());
+        std::vector<Point *> right_of_median(points.begin() + middle + 1, points.end());
 
         // Create node, recursively call to construct subtree
         return new Node(axis, median, build(left_of_median, depth + 1),
@@ -112,7 +112,8 @@ class KDTree {
 
         str += std::string(depth, '-') + std::to_string(point->coordinates[0]) + ", " +
                std::to_string(point->coordinates[1]) + ", " +
-               std::to_string(point->coordinates[2]) + "\n";
+               std::to_string(point->coordinates[2]) + " with axis " + std::to_string(node->axis) +
+               "\n";
 
         to_string_recurse(str, node->left, depth + 1);
         to_string_recurse(str, node->right, depth + 1);

main.cpp

@@ -1,7 +1,18 @@
+#include "kdtree.h"
 #include <iostream>
 
 int main() {
     std::cout << "Hello World!" << std::endl;
 
+    // Test points
+    std::vector<Point *> points{new Point(new float[3]{0.0, 0.0, 0.0}, nullptr),
+                                new Point(new float[3]{0.0, 1.0, 0.0}, nullptr),
+                                new Point(new float[3]{0.0, 2.0, 3.0}, nullptr),
+                                new Point(new float[3]{1.0, 0.0, 4.0}, nullptr)};
+
+    KDTree tree = KDTree(points);
+
+    std::cout << tree.to_string();
+
     return 0;
 }