diff --git a/src/day1.cpp b/src/day1.cpp
index c934201..c7991fe 100644
--- a/src/day1.cpp
+++ b/src/day1.cpp
@@ -4,23 +4,21 @@
 
 struct Data{ char dir; int64_t cnt; };
 
-using std::cout, std::endl, std::vector, std::ifstream;
-
-int64_t part_1(const vector<Data>&);
-int64_t part_2(const vector<Data>&);
+int64_t part_1(const std::vector<Data>&);
+int64_t part_2(const std::vector<Data>&);
 
 int main() {
-  ifstream file{"input/2025-1.txt"};
+  std::ifstream file{"input/2025-1.txt"};
   Data line;
-  vector<Data> v;
+  std::vector<Data> v;
   while (file >> line.dir >> line.cnt) {
     v.push_back(line);
   }
-  cout << "Part 1: " << part_1(v) << endl;
-  cout << "Part 1: " << part_2(v) << endl;
+  std::cout << "Part 1: " << part_1(v) << std::endl;
+  std::cout << "Part 1: " << part_2(v) << std::endl;
 }
 
-int64_t part_1(const vector<Data>& v) {
+int64_t part_1(const std::vector<Data>& v) {
    int64_t loc{50}, presses{0};
    for (auto data : v) {
      if (data.dir == 'L') {
@@ -40,7 +38,7 @@ int64_t part_1(const vector<Data>& v) {
   return presses;
 }
 
-int64_t part_2(const vector<Data>& v) {
+int64_t part_2(const std::vector<Data>& v) {
    int64_t loc{50}, presses{0};
    for (auto data : v) {
      auto last_loc = loc;