code: end

histogram.cpp

@@ -0,0 +1,79 @@
+#include <iostream>
+#include "histogram.h"
+#include "histogram_internal.h"
+#include <algorithm>
+#include <cmath>
+
+
+void find_minmax(const std::vector<double>& numbers, double& min, double& max) {
+    if (numbers.empty()) return;
+
+    min = numbers[0];
+    max = numbers[0];
+    for (double num : numbers) {
+        if (num < min) min = num;
+        if (num > max) max = num;
+    }
+}
+
+std::vector<size_t> make_histogram(const std::vector<double>& numbers, size_t bin_count) {
+    if (numbers.empty() || bin_count == 0) return {};
+
+    double min, max;
+    find_minmax(numbers, min, max);
+
+    std::vector<size_t> bins(bin_count);
+    double bin_size = (max - min) / bin_count;
+
+    for (double num : numbers) {
+        bool found = false;
+        for (size_t j = 0; j < bin_count - 1 && !found; ++j) {
+            double lo = min + j * bin_size;
+            double hi = min + (j + 1) * bin_size;
+            if (lo <= num && num < hi) {
+                bins[j]++;
+                found = true;
+            }
+        }
+        if (!found) {
+            bins[bin_count - 1]++;
+        }
+    }
+
+    return bins;
+}
+
+Input input_data() {
+    Input in;
+    std::cin >> in.number_count;
+
+    in.numbers.resize(in.number_count);
+    for (size_t i = 0; i < in.number_count; i++) {
+        std::cin >> in.numbers[i];
+    }
+
+    std::cin >> in.bin_count;
+    return in;
+}
+
+void show_histogram_text(const std::vector<size_t>& bins, size_t max_width) {
+    if (bins.empty()) return;
+
+    size_t max_count = *std::max_element(bins.begin(), bins.end());
+    if (max_count == 0) return;
+
+    for (size_t count : bins) {
+
+        if (count < 100) std::cout << " ";
+        if (count < 10) std::cout << " ";
+
+        std::cout << count << "|";
+
+
+        size_t bar_length = (count * max_width) / max_count;
+        for (size_t i = 0; i < bar_length; ++i) {
+            std::cout << "*";
+        }
+        std::cout << std::endl;
+    }
+}

histogram.h

@@ -0,0 +1,17 @@
+#ifndef HISTOGRAM_H
+#define HISTOGRAM_H
+
+#include <vector>
+
+struct Input {
+    std::vector<double> numbers;
+    size_t bin_count{};
+    size_t number_count;
+};
+
+
+Input input_data();
+std::vector<size_t> make_histogram(const std::vector<double>& numbers, size_t bin_count);
+void show_histogram_text(const std::vector<size_t>& bins, size_t max_width = 80);
+
+#endif

histogram_internal.h

@@ -0,0 +1,8 @@
+#ifndef HISTOGRAM_INTERNAL_H
+#define HISTOGRAM_INTERNAL_H
+
+#include <vector>
+
+void find_minmax(const std::vector<double>& numbers, double& min, double& max);
+
+#endif

main.cpp

@@ -1,4 +1,5 @@
 #include "histogram.h"
+#include <iostream>
 
 int main() {
     auto in = input_data();
@@ -6,4 +7,3 @@ int main() {
     show_histogram_text(bins);
     return 0;
 }
-

svg.cpp

@@ -0,0 +1,56 @@
+#include "svg.h"
+#include <algorithm>
+#include <string>
+
+using namespace std;
+
+namespace svg {
+    void begin(ostream& out, double width, double height) {
+        out << "<?xml version='1.0' encoding='UTF-8'?>\n";
+        out << "<svg width='" << width << "' height='" << height << "' "
+            << "viewBox='0 0 " << width << " " << height << "' "
+            << "xmlns='http://www.w3.org/2000/svg'>\n";
+    }
+
+    void end(ostream& out) {
+        out << "</svg>\n";
+    }
+
+    void text(ostream& out, double left, double baseline, const string& text) {
+        out << "<text x='" << left << "' y='" << baseline << "'>" << text << "</text>\n";
+    }
+
+    void rect(ostream& out, double x, double y, double width, double height,
+              const string& stroke, const string& fill) {
+        out << "<rect x='" << x << "' y='" << y << "' width='" << width
+            << "' height='" << height << "' stroke='" << stroke
+            << "' fill='" << fill << "' />\n";
+    }
+
+    void show_histogram_svg(ostream& out, const vector<size_t>& bins) {
+        begin(out, IMAGE_WIDTH, IMAGE_HEIGHT);
+
+        if (bins.empty()) {
+            end(out);
+            return;
+        }
+
+
+        size_t max_count = *max_element(bins.begin(), bins.end());
+        double scale = (max_count > 0) ? (IMAGE_WIDTH - TEXT_WIDTH) / static_cast<double>(max_count) : 1.0;
+
+        double top = 0;
+        for (size_t bin : bins) {
+            const double bin_width = bin * scale;
+            text(out, TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+
+
+            string fill_color = (static_cast<int>(top / BIN_HEIGHT) % 2 == 0) ? "#aaffaa" : "#aaaaff";
+            rect(out, TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "black", fill_color);
+
+            top += BIN_HEIGHT;
+        }
+
+        end(out);
+    }
+}

svg.h

@@ -0,0 +1,27 @@
+#ifndef SVG_H
+#define SVG_H
+
+#include <vector>
+#include <string>
+#include <iostream>
+
+
+const size_t IMAGE_WIDTH = 400;
+const size_t IMAGE_HEIGHT = 300;
+const size_t TEXT_LEFT = 20;
+const size_t TEXT_BASELINE = 20;
+const size_t TEXT_WIDTH = 50;
+const size_t BIN_HEIGHT = 30;
+const size_t BLOCK_WIDTH = 10;
+
+namespace svg {
+    void begin(std::ostream& out, double width, double height);
+    void end(std::ostream& out);
+    void text(std::ostream& out, double left, double baseline, const std::string& text);
+    void rect(std::ostream& out, double x, double y, double width, double height,
+              const std::string& stroke = "black", const std::string& fill = "#dddddd");
+
+    void show_histogram_svg(std::ostream& out, const std::vector<size_t>& bins);
+}
+
+#endif

unittest.cbp

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_project_file>
+	<FileVersion major="1" minor="6" />
+	<Project>
+		<Option title="unittest" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="Debug">
+				<Option output="bin/Debug/unittest" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Debug/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-g" />
+				</Compiler>
+			</Target>
+			<Target title="Release">
+				<Option output="bin/Release/unittest" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Release/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-O2" />
+				</Compiler>
+				<Linker>
+					<Add option="-s" />
+				</Linker>
+			</Target>
+		</Build>
+		<Compiler>
+			<Add option="-Wall" />
+		</Compiler>
+		<Extensions>
+			<lib_finder disable_auto="1" />
+		</Extensions>
+	</Project>
+</CodeBlocks_project_file>