доделал

project/histogram.cpp

@@ -2,6 +2,7 @@
 #include <vector>
 #include "histogram.h"
 using namespace std;
+
 void
 find_minmax(vector<double> numbers, double& min, double& max) {
     min = numbers[0];
@@ -18,7 +19,7 @@ find_minmax(vector<double> numbers, double& min, double& max) {
 
 vector<size_t>
 make_histogram(vector<double> numbers, size_t bin_count) {
-    vector <size_t> bins(bin_count);
+    vector <size_t> bins(bin_count, 0);
     double min, max;
     find_minmax(numbers, min, max);
     size_t countt;

project/histogram_internal.h

@@ -0,0 +1,6 @@
+#ifndef HISTOGRAM_INTERNAL_H_INCLUDED
+#define HISTOGRAM_INTERNAL_H_INCLUDED
+#include <vector>
+
+void find_minmax(std::vector<double> numbers, double &min, double &max);
+#endif // HISTOGRAM_INTERNAL_H_INCLUDED

project/main.cpp

@@ -3,10 +3,12 @@
 #include "histogram.h"
 #include "text.h"
 #include "svg.h"
+
 using namespace std;
+
 struct Input {
     vector<double> numbers;
-    size_t bin_count{};
+    size_t bin_count;
 };
 
 Input
@@ -18,14 +20,17 @@ input_data(){
     in.numbers.resize(number_count);
     for(int i;i<number_count;i++)
     {
+        cerr << i + 1 << ": ";
         cin >> in.numbers[i];
     }
     cerr << "Enter bin count: ";
     cin >> in.bin_count;
+    getchar();
     return in;
 }
 int main()
-{   Input in = input_data();
+{
+    Input in = input_data();
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;

project/svg.h

@@ -1,6 +1,7 @@
 #ifndef SVG_H_INCLUDED
 #define SVG_H_INCLUDED
 #include <vector>
+
 void
 show_histogram_svg(const std::vector<size_t>& bins);
 

project/test.html

@@ -0,0 +1,3 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<svg width='400' height='300' viewBox='0 0 400 300' xmlns='http://www.w3.org/2000/svg'>
+<rect x='0' y='0' width='175' height='30' stroke='white' fill='#ffffff' /><text x='360' y='20'>1</text><rect x='175' y='0' width='175' height='30' stroke='red' fill='#aaffaa' /><rect x='0' y='30' width='175' height='30' stroke='white' fill='#ffffff' /><text x='360' y='50'>1</text><rect x='175' y='30' width='175' height='30' stroke='red' fill='#aaffaa' /><rect x='0' y='60' width='0' height='30' stroke='white' fill='#ffffff' /><text x='360' y='80'>2</text><rect x='0' y='60' width='350' height='30' stroke='red' fill='#aaffaa' /></svg>

project/text.cpp

@@ -2,7 +2,9 @@
 #include <vector>
 #include "text.h"
 #include "histogram.h"
+
 using namespace std;
+
 void
 show_histogram_text(vector<size_t> bins, size_t bin_count){
     const size_t SCREEN_WIDTH = 80;

project/text.h

@@ -1,5 +1,6 @@
 #ifndef TEXT_H_INCLUDED
 #define TEXT_H_INCLUDED
+#include <vector>
 
 void
 show_histogram_text(std::vector<size_t> bins, size_t bin_count);

project/unittest.cpp

@@ -0,0 +1,12 @@
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "histogram_internal.h"
+#include "doctest.h"
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+}