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class Solution:

# @param digits, a list of integer digits

# @return a list of integer digits

def plusOne(self, digits):

# In-place version

digits.reverse()

d = digits[0]

digits[0] = (d + 1) % 10

carry = (d + 1) / 10

for i, d in enumerate(digits[1:], 1):

digits[i] = (d + carry) % 10

carry = (d + carry) / 10

if carry == 1:

digits.append(1)

digits.reverse()

return digits