Merge pull request keon#84 from ankit167/Check_for_negative_numbers

Check if the input is negative

Author: ankit167

bit/count_ones.py

@@ -6,6 +6,8 @@
 For example, the 32-bit integer ’11' has binary
 representation 00000000000000000000000000001011,
 so the function should return 3.
+
+T(n)- O(log n)
 """
 
 
@@ -14,6 +16,8 @@ def count_ones(n):
     :type n: int
     :rtype: int
     """
+    if n < 0:
+        return
     counter = 0
     while n:
         counter += n & 1