@@ -0,0 +1,23 @@
+class Solution:
+    def validSquare(self, p1: list[int], p2: list[int], p3: list[int], p4: list[int]) -> bool:
+        
+        def get_distance(p1, p2):
+            x1, y1 = p1
+            x2, y2 = p2
+            return (x1-x2) ** 2 + (y1-y2) ** 2
+        
+        points=[p1,p2,p3,p4]
+        distances = []
+
+        for i in range(4):
+            for j in range(i+1, 4):
+                distances.append(get_distance(points[i], points[j]))
+        
+        distances.sort()
+
+        return (
+            distances[0] > 0
+            and distances[0] == distances[1] == distances[2] == distances[3]
+            and distances[4] == distances[5]
+            and distances[4] == 2 * distances[0]
+        )