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089_Gray_Code.py

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class Solution(object):

def grayCode(self, n):

"""

:type n: int

:rtype: List[int]

"""

# https://leetcode.com/discuss/86617/6-line-java-solution-very-concise

res = [0]

for i in range(n):

for j in reversed(range(len(res))):

res.append(res[j] + (1 << i))

return res

# def count_one(self, num):

# count = 0

# while num:

# num &= (num - 1)

# count += 1

# return count

if __name__ == "__main__":

s = Solution()

print s.grayCode(2)