Share my Python Solution


  • 1

    We add 2^i to the corresponding number in the reversed copy of the previous array, then append it to the array each time.

    class Solution:
        # @return a list of integers
        def grayCode(self, n):
            a = [0]
            for i in range(n):
                a += list(x + 2**i for x in a[::-1])
            return a

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