diff --git a/.common/cpp/skeleton.cpp b/.common/cpp/skeleton.cpp
index 0f0ed86..0e0fc71 100644
--- a/.common/cpp/skeleton.cpp
+++ b/.common/cpp/skeleton.cpp
@@ -20,15 +20,9 @@
 #include <string>
 #include <vector>
 
-template <typename T, typename U>
-std::ostream &operator<<(std::ostream &s, std::pair<T, U> const &p) {
-  return s << p.first << " " << p.second;
-}
-
-namespace helpers {
-
-namespace math {
+#pragma region helpers
 
+#pragma region math
 static constexpr std::int32_t MODULO = 1000000007;
 
 long pow(long base, long exp) {
@@ -37,11 +31,25 @@ long pow(long base, long exp) {
   if (exp % 2 == 0) return half * half;
   return half * half * base;
 }
+#pragma endregion /* math */
 
-}  // namespace math
+#pragma region output
+template <typename T, typename U>
+std::ostream &operator<<(std::ostream &os, std::pair<T, U> const &p) {
+  return os << p.first << " " << p.second;
+}
 
-namespace input {
 
+template <typename T>
+inline void answer(const T &ans) {
+  std::cout << ans << "\n";
+}
+
+inline void yes() { std::cout << "YES\n"; }
+inline void no() { std::cout << "NO\n"; }
+inline void yesno(bool ans) { std::cout << (ans ? "YES" : "NO") << "\n"; }
+
+#pragma region input
 template <typename T>
 std::vector<T> load_vector(std::size_t size) {
   std::vector<T> result{};
@@ -54,31 +62,12 @@ std::vector<T> load_vector(std::size_t size) {
 
   return result;
 }
+#pragma endregion /* input */
 
-}  // namespace input
-
-namespace output {
-
-template <typename T>
-inline void answer(const T &ans) {
-  std::cout << ans << "\n";
-}
-
-inline void yes() { std::cout << "YES\n"; }
-inline void no() { std::cout << "NO\n"; }
-inline void yesno(bool ans) { std::cout << (ans ? "YES" : "NO") << "\n"; }
-
-}  // namespace output
-
-using namespace std;
-
-using namespace math;
-using namespace input;
-using namespace output;
 
 #define LOOP(var, n) for (auto var = 0; var < n; ++var)
 
-}  // namespace helpers
+#pragma endregion /* helpers */
 
 // for ‹N› test cases, uncomment for single test case
 // #define SINGLE
@@ -86,7 +75,6 @@ using namespace output;
 namespace solution {
 
 using namespace std;
-using namespace helpers;
 
 void solve() {
   // TODO