Actualize un poco las soluciones en c++ por aprender cositas

2020/day_1/report_repair.cc

@@ -12,7 +12,6 @@ std::set<int> read_input_file() {
   while(std::getline(file, line)) 
     data.insert(std::stoi(line));
 
-  file.close();
   return data;
 }
 
@@ -22,7 +21,6 @@ int main(){
 
   for(auto &i: data) {
     int rest = 2020 - i;
-
     for(auto &j: data) {
       int second_rest = rest - j;
       if (data.count(second_rest)) {

2020/day_2/password_philosophy.cc

@@ -0,0 +1,54 @@
+#include <algorithm>
+#include <iostream>
+#include <sstream>
+#include <fstream>
+#include <regex>
+#include <vector>
+#include <string>
+
+struct tokenized {
+  int first;
+  int second;
+  char letter;
+  std::string password; 
+};
+
+std::vector<std::string> read_input_file() {
+  std::ifstream file("input");
+  std::vector<std::string> data;
+  std::string line;
+
+  while(std::getline(file, line)) 
+    data.push_back(line);
+
+  return data;
+}
+
+tokenized parse_line(std::string &s) {
+  std::smatch match;
+  std::regex regex = std::regex("(.+)-(.+) (.): (.+)");
+  std::regex_search(s, match, regex);
+
+  return {stoi(match.str(1)), stoi(match.str(2)), match.str(3)[0], match.str(4)};
+}
+
+int main(){
+  auto data = read_input_file();
+
+  int result_a = 0;
+  int result_b = 0;
+
+  for(auto &line: data) {
+    auto t = parse_line(line);
+    int count = std::count(t.password.begin(), t.password.end(), t.letter);
+
+    if(t.first <= count && count <= t.second) 
+      result_a++;
+    if((t.password[t.first - 1] == t.letter) ^ (t.password[t.second - 1] == t.letter)) 
+      result_b++;
+  }
+
+  std::cout << result_a << ' ' << result_b << std::endl;
+
+  return 0;
+}

2020/day_2/password_philosophy.cpp

@@ -1,56 +0,0 @@
-#include <algorithm>
-#include <iostream>
-#include <sstream>
-#include <fstream>
-#include <vector>
-#include <string>
-
-std::vector<std::string> read_input_file() {
-  std::ifstream file("input");
-  std::vector<std::string> data;
-  std::string line;
-
-  while(std::getline(file, line)) 
-    data.push_back(line);
-
-  return data;
-}
-
-std::vector<std::string> split(const std::string &s, char delimiter) {
-  std::vector<std::string> tokens;
-  std::string token;
-  std::istringstream token_stream(s);
-
-  while(std::getline(token_stream, token, delimiter)) 
-    tokens.push_back(token);
-
-  return tokens;
-}
-
-int main(){
-  auto data = read_input_file();
-
-  int result_a = 0;
-  int result_b = 0;
-
-  for(auto &line: data) {
-    auto main_split = split(line, ' ');
-    auto number_split = split(main_split[0], '-');
-
-    int first = stoi(number_split[0]);
-    int second = stoi(number_split[1]);
-    char letter = main_split[1][0];
-    std::string password = main_split[2];
-
-    int count = std::count(password.begin(), password.end(), letter);
-
-    if(first <= count && count <= second) 
-      result_a++;
-    if((password[first - 1] == letter) ^ (password[second - 1] == letter)) 
-      result_b++;
-  }
-
-  std::cout << result_a << ' ' << result_b << std::endl;
-
-  return 0;
-}