code: вариант

.gitignore

@@ -1,3 +1,4 @@
 /bin
 /obj
 /test.layout
+/curl

main.cpp

@@ -1,3 +1,6 @@
+#include <sstream>
+#include <string>
+#include <curl/curl.h>
 #include <iostream>
 #include <vector>
 #include "histogram.h"
@@ -14,32 +17,94 @@ struct Input {
 };
 
 Input
-input_data(istream& in) {
-    Input in;
+input_data(istream& in, bool prompt) {
+    if (prompt==true){
+    Input input;
     cerr << "Enter number count: ";
-    cin >> in.number_count;
+    in >> input.number_count;
 
-    vector<double> numbers(in.number_count);
-    in.numbers.resize(in.number_count);
-    for (size_t i = 0; i < in.number_count; i++) {
-        cin >> in.numbers[i];
+    vector<double> numbers(input.number_count);
+    input.numbers.resize(input.number_count);
+    for (size_t i = 0; i < input.number_count; i++) {
+        in >> input.numbers[i];
     }
 
     size_t bin_count;
     cerr << "Enter bin count: ";
-    cin >> in.bin_count;
+    in >> input.bin_count;
 
     size_t max_count;
-    in.max_count = 0;
-    return in;
+    input.max_count = 0;
+    return input;
+    }
+
+    if (prompt==false){
+    Input input;
+
+    in >> input.number_count;
+
+    vector<double> numbers(input.number_count);
+    input.numbers.resize(input.number_count);
+    for (size_t i = 0; i < input.number_count; i++) {
+        in >> input.numbers[i];
+    }
+
+    size_t bin_count;
+    in >> input.bin_count;
+
+    size_t max_count;
+    input.max_count = 0;
+    return input;
+    }
+}
+
+
+size_t
+write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
+    size_t data_size = item_size * item_count;
+    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
+    buffer->write(reinterpret_cast<const char*>(items), data_size);
+    return data_size;
 }
 
 
 
-int main()
+Input
+download(const string& address) {
+    stringstream buffer;
+    CURL *curl = curl_easy_init();
+    curl_version_info_data *curl_version_info(CURLversion protocols);
+    if(curl) {
+        CURLcode res;
+        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+        res = curl_easy_perform(curl);
+        curl_easy_cleanup(curl);
+        if (res!=0){
+            cout<<res;
+            exit(1);
+            }
+
+            curl_version_info_data *ver = curl_version_info(CURLVERSION_NOW);
+            cerr<<(curl_version_info(CURLVERSION_NOW));
+        }
+    curl_global_init(CURL_GLOBAL_ALL);
+    return input_data(buffer, false);
+}
+
+
+
+int main(int argc, char* argv[])
 {
-    auto in = input_data(cin);
-    auto bins = make_histogram(in.numbers, in.bin_count, in.number_count, in.max_count);
+    Input in;
+    if (argc > 1) {
+        in = download(argv[1]);
+    }
+    else {
+        in = input_data(cin, true);
+    }
+    const auto bins = make_histogram(in.numbers, in.bin_count, in.number_count, in.max_count);
     vector<double> test;
     show_histogram_svg(bins, in.max_count, in.bin_count, test);