Third hw was completed

sem2/BelyaevNA/homework_3/StringForge.cpp

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+#include <algorithm>
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <vector>
+
+int main() {
+  std::ifstream input("input.txt");
+  if (!input) {
+    std::cerr << "Failed to open input.txt\n";
+    return 1;
+  }
+
+  std::vector<std::string> lines;
+  std::string line;
+  while (std::getline(input, line)) {
+    lines.push_back(line);
+  }
+  input.close();
+
+  std::vector<std::string> original = lines;
+
+  size_t threshold;
+  std::string search_word;
+
+  std::cout << "Enter length threshold: ";
+  std::cin >> threshold;
+  std::cout << "Enter word to search: ";
+  std::cin >> search_word;
+
+  auto remove_short = [threshold](std::vector<std::string>& vec) {
+    vec.erase(std::remove_if(vec.begin(), vec.end(),
+                             [threshold](const std::string& s) {
+                               return s.length() < threshold;
+                             }),
+              vec.end());
+  };
+  remove_short(lines);
+
+  std::vector<std::string> replaced = lines;
+  std::for_each(replaced.begin(), replaced.end(), [](std::string& s) {
+    std::replace(s.begin(), s.end(), ' ', '_');
+  });
+
+  std::string found_line = "Not found";
+  auto find_word = [&search_word,
+                    &found_line](const std::vector<std::string>& vec) {
+    auto it = std::find_if(vec.begin(), vec.end(),
+                           [&search_word](const std::string& s) {
+                             return s.find(search_word) != std::string::npos;
+                           });
+    if (it != vec.end()) {
+      found_line = *it;
+    }
+  };
+  find_word(replaced);
+
+  size_t total_no_underscore = 0;
+  for (const auto& s : replaced) {
+    for (char c : s) {
+      if (c != '_') total_no_underscore++;
+    }
+  }
+
+  std::vector<int> lengths;
+  std::transform(
+      replaced.begin(), replaced.end(), std::back_inserter(lengths),
+      [](const std::string& s) { return static_cast<int>(s.length()); });
+
+  std::ofstream output("output.txt");
+  if (!output) {
+    std::cerr << "Failed to create output.txt\n";
+    return 1;
+  }
+
+  output << "Original vector:\n";
+  for (const auto& s : original) output << s << "\n";
+  output << "\n";
+
+  output << "After removing strings shorter than " << threshold << ":\n";
+  for (const auto& s : lines) output << s << "\n";
+  output << "\n";
+
+  output << "After replacing spaces with '_':\n";
+  for (const auto& s : replaced) output << s << "\n";
+  output << "\n";
+
+  output << "Search result for \"" << search_word << "\": " << found_line
+         << "\n\n";
+
+  output << "Total characters without '_': " << total_no_underscore << "\n\n";
+
+  output << "Vector of line lengths: ";
+  for (int len : lengths) output << len << " ";
+  output << "\n";
+
+  output.close();
+  std::cout << "Done. Check output.txt\n";
+
+  return 0;
+}

sem2/BelyaevNA/homework_3/input.txt

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+Player controller script
+NPC AI behavior tree
+HP bar UI element
+Respawn point manager
+Quest system update
+Boss fight arena trigger
+Low poly tree model
+Inventory slot hover effect
+Main menu background music loop
+Save game data serializer
+FOV slider settings
+Critical hit chance calculator
+Ragdoll physics test
+Loot table randomizer
+Enemy spawn wave logic

sem2/BelyaevNA/homework_3/output.txt

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+Original vector:
+Player controller script
+NPC AI behavior tree
+HP bar UI element
+Respawn point manager
+Quest system update
+Boss fight arena trigger
+Low poly tree model
+Inventory slot hover effect
+Main menu background music loop
+Save game data serializer
+FOV slider settings
+Critical hit chance calculator
+Ragdoll physics test
+Loot table randomizer
+Enemy spawn wave logic
+
+After removing strings shorter than 25:
+Inventory slot hover effect
+Main menu background music loop
+Save game data serializer
+Critical hit chance calculator
+
+After replacing spaces with '_':
+Inventory_slot_hover_effect
+Main_menu_background_music_loop
+Save_game_data_serializer
+Critical_hit_chance_calculator
+
+Search result for "spawn": Not found
+
+Total characters without '_': 100
+
+Vector of line lengths: 27 31 25 30