Increment Digit Array

Q: Increment Digit Array

This question evaluates a candidate's competency in array manipulation and elementary arithmetic on digit sequences, including carry propagation and handling edge cases when incrementing a number represented as a digit array in the Coding & Algorithms domain.

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Question

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Given a non-empty array of digits representing a non-negative integer, add one to the integer and return the resulting array of digits.

Assumptions:

The most significant digit is at index 0.
Each element is an integer from 0 to 9.
The input has no leading zeros unless the number itself is 0.
Do not convert the entire array to a built-in big integer type.

Examples:

[1,2,3] -> [1,2,4]
[4,3,2,1] -> [4,3,2,2]
[9] -> [1,0]
[9,9,9] -> [1,0,0,0]

Write an efficient Python solution and state its time and space complexity.

Increment Digit Array

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