66. Plus One
# Easy
Only the last digit matter.
Judge the last digit can improve efficiency in some extend.
class Solution:
def plusOne(self, digits: List[int]) -> List[int]:
digits[-1] += 1
if digits[-1] != 10:
return digits
# if last digit is 10
result = [0]
result.extend(digits)
for i in reversed(range(1, len(result))):
if result[i] == 10:
result[i] = 0
result[i-1] += 1
if result[0] == 0:
return result[1:]
else:
return result
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