Create count-number-of-teams.py

Author: kamyu104

Python/count-number-of-teams.py

@@ -0,0 +1,19 @@
+# Time:  O(n^2)
+# Space: O(1)
+
+class Solution(object):
+    def numTeams(self, rating):
+        """
+        :type rating: List[int]
+        :rtype: int
+        """
+        result = 0
+        for i in xrange(1, len(rating)-1):
+            less, greater = [0]*2, [0]*2
+            for j in xrange(len(rating)):
+                if rating[i] > rating[j]:
+                    less[i < j] += 1
+                if rating[i] < rating[j]:
+                    greater[i < j] += 1
+            result += less[0]*greater[1] + greater[0]*less[1]
+        return result