Create count-collisions-of-monkeys-on-a-polygon.py

Author: kamyu104

Python/count-collisions-of-monkeys-on-a-polygon.py

@@ -0,0 +1,12 @@
+# Time:  O(logn)
+# Space: O(1)
+
+# combinatorics, fast exponentiation
+class Solution(object):
+    def monkeyMove(self, n):
+        """
+        :type n: int
+        :rtype: int
+        """
+        MOD = 10**9+7
+        return (pow(2, n, MOD)-2)%MOD