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

2020/day_1/report_repair.cc

@@ -0,0 +1,34 @@
+#include <algorithm>
+#include <iostream>
+#include <fstream>
+#include <set>
+#include <string>
+
+std::set<int> read_input_file() {
+  std::ifstream file("input");
+  std::set<int> data;
+  std::string line;
+
+  while(std::getline(file, line)) 
+    data.insert(std::stoi(line));
+
+  return data;
+}
+
+int main(){
+  auto data = read_input_file();
+  int iterations = 0;
+
+  for(auto &i: data) {
+    int rest = 2020 - i;
+    for(auto &j: data) {
+      int second_rest = rest - j;
+      if (data.count(second_rest)) {
+        std::cout << i * j * second_rest << std::endl;
+        return 0;
+      }
+    }
+  }
+
+  return 1;
+}