diff --git a/.common/cpp/skeleton.cpp b/.common/cpp/skeleton.cpp
index 7dfbc25..72e96c9 100644
--- a/.common/cpp/skeleton.cpp
+++ b/.common/cpp/skeleton.cpp
@@ -22,6 +22,31 @@
 
 #pragma region helpers
 
+#pragma region aliases
+#define LOOP(var, n) for (auto var = 0; var < n; ++var)
+
+template <typename T>
+using V = std::vector<T>;
+
+template <typename K, typename V>
+using M = std::map<K, V>;
+
+template <typename T>
+using S = std::set<T>;
+
+template <typename T>
+using Q = std::deque<T>;
+
+using i8 = std::int8_t;
+using u8 = std::uint8_t;
+using i16 = std::int16_t;
+using u16 = std::uint16_t;
+using i32 = std::int32_t;
+using u32 = std::uint32_t;
+using i64 = std::int64_t;
+using u64 = std::uint64_t;
+#pragma endregion /* aliases */
+
 #pragma region debug
 void dbg_out() { std::cerr << std::endl; }
 template <typename Head, typename... Tail>
@@ -113,8 +138,6 @@ inline void no() { std::cout << "NO\n"; }
 inline void yesno(bool ans) { std::cout << (ans ? "YES" : "NO") << "\n"; }
 #pragma endregion /* output */
 
-#define LOOP(var, n) for (auto var = 0; var < n; ++var)
-
 #pragma endregion /* helpers */
 
 // for ‹N› test cases, uncomment for single test case