code: добавлены тесты

histogram.cpp

@@ -4,6 +4,11 @@
 using namespace std;
 
 void find_minmax(const vector<double>& numbers, double& min, double& max) {
+    if (numbers.empty()) {
+        min = 0;
+        max = 0;
+        return;
+    }
     min = numbers[0];
     max = numbers[0];
     for (float x : numbers) {