Create concatenation-of-consecutive-binary-numbers.py

Author: kamyu104

Python/concatenation-of-consecutive-binary-numbers.py

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+# Time:  O(n)
+# Space: O(1)
+
+class Solution(object):
+    def concatenatedBinary(self, n):
+        """
+        :type n: int
+        :rtype: int
+        """
+        MOD = 10**9+7
+        result = l = 0
+        for i in xrange(1, n+1):
+            if i&(i-1) == 0:
+                l += 1
+            result = ((result<<l)%MOD+i)%MOD
+        return result