Non-working solution for N

constellation.py

@@ -1,21 +1,41 @@
 class Star:
-    def __init__(self, x, y):
-        self.x = x
-        self.y = y
+    def __init__(self):
+        self.x = None
+        self.y = None
 
-    def distance_sqr(self, other):
-        return ((self.x - other.x) ** 2) + ((self.y - other.y) ** 2))
+    def dist_sqr(self, star):
+        return (self.x - star.x) ** 2 + (self.y - star.y) ** 2
 
-def return_key(A):
-    return A[2] << 32 
-
-def find_constellation(S):
-    T = []
+def find_constellations(M, S):
     for i in range(len(S)):
         for j in range(i+1, len(S)):
-            T.append( (S[i], S[j], S[i].distance_sqr(S[j])) )
+            M[i][j] = Star.dist_sqr(S[i], S[j])
+            M[j][i] = M[i][j]
+    c = 0
+    for i in range(len(S)):
+        D = {}
+        for j in range(len(S)):
+            if i == j:
+                continue
+            if M[i][j] not in D:
+                D[M[i][j]] = 1
+            else:
+                D[M[i][j]] += 1
+        for k in D:
+            if D[k] >= 2:
+                c += int(D[k] * (D[k] - 1) / 2)
+    return c
+
+if __name__ == "__main__":
+    n = int(input())
+    M = [[None] * n] * n
+    S = []
+    for i in range(n):
+        st = input().split()
+        star = Star()
+        star.x = int(st[0])
+        star.y = int(st[1])
+        S.append(star)
+    print(find_constellations(M, S))
 
-    T.sort(key=return_key)
 
-    cnt = 0
-    for i in range(len(T)):

constellation.txt

@@ -0,0 +1,7 @@
+6
+5 6
+6 5
+7 6
+6 7
+7 8
+8 7