https://leetcode.com/problems/number-of-equivalent-domino-pairs

easy/number_of_equivalent_domino_pairs.py

@@ -0,0 +1,17 @@
+# https://leetcode.com/problems/number-of-equivalent-domino-pairs
+
+from typing import Dict, List, Tuple
+
+class Solution:
+    def numEquivDominoPairs(self, dominoes: List[List[int]]) -> int:
+        m: Dict[Tuple[int, int], int] = {}
+        result = 0
+        for [v1, v2] in dominoes:
+            t = (v1, v2)
+            if v2 > v1:
+                t = (v2, v1)
+            if t in m:
+                result += m[t]
+            m[t] = m.get(t, 0) + 1
+        return result
+