1 files changed, 17 insertions, 0 deletions
diff --git a/datastructures/stlHashMap.cpp b/datastructures/stlHashMap.cpp
new file mode 100644
index 0000000..b107dde
--- /dev/null
+++ b/datastructures/stlHashMap.cpp
@@ -0,0 +1,17 @@
+#include <ext/pb_ds/assoc_container.hpp>
+using namespace __gnu_pbds;
+
+template<typename T>
+struct betterHash {
+	size_t operator()(T o) const {
+		size_t h = hash<T>()(o) ^ 42394245; //random value
+		h = ((h >> 16) ^ h) * 0x45d9f3b;
+		h = ((h >> 16) ^ h) * 0x45d9f3b;
+		h = ((h >> 16) ^ h);
+		return h;
+}};
+
+template<typename K, typename V, typename H = betterHash<K>>
+using hashMap = gp_hash_table<K, V, H>;
+template<typename K, typename H = betterHash<K>>
+using hashSet = gp_hash_table<K, null_type, H>;