66. Plus One

Python

To String and plus it

class Solution:
    def plusOne(self, digits: List[int]) -> List[int]:
        num = int(''.join([str(n) for n in digits]))
        return [int(n) for n in str(num+1)]

Loop and carry

class Solution:
    def plusOne(self, digits: List[int]) -> List[int]:
        carry = 1

        for i in range(len(digits)-1, -1, -1):
            digits[i] += carry
            if digits[i] // 10 < 1:
                carry = 0
                break
            digits[i] %= 10

        return [1] + digits if carry else digits