Create number-of-distinct-averages.py

Author: kamyu104

Python/number-of-distinct-averages.py

@@ -0,0 +1,17 @@
+# Time:  O(nlogn)
+# Space: O(n)
+
+# sort, two pointers, hash table
+class Solution(object):
+    def distinctAverages(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: int
+        """
+        lookup = set()
+        nums.sort()
+        left, right = 0, len(nums)-1
+        while left < right:
+            lookup.add(nums[left]+nums[right])
+            left, right = left+1, right-1
+        return len(lookup)