emplace... why not?

src/day3.cpp

@@ -12,7 +12,7 @@ int main() {
   std::string line;
   std::vector<std::string> v;
   while (std::getline(file, line)) {
-    v.push_back(line);
+    v.emplace_back(line);
   }
   std::cout << "Part 1: " << part_1(v) << std::endl;
   std::cout << "Part 2: " << part_2(v) << std::endl;