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Solution: Plus One

Understand how to increment a non-negative integer given as a digit array by applying arithmetic addition with carry rules. This lesson guides you through an O(N) time solution that updates the array in place or creates a new array if all digits are 9, teaching a foundational pattern useful in coding interviews.

Statement

You are given a non-negative integer represented as an integer array, digits, where each element in digits[i] corresponds to a single digit of the integer. The digits are arranged from most significant (left) to least significant (right), and the number has no leading zeros.

Your task is to add one to this integer and return the updated number in the same digit-array format.

Constraints:

  • 11 \leq digits.length 100\leq 100

  • 00 \leq digits[i] 9\leq 9 ...