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Given a non-negative number represented as an array of digits,

add 1 to the number ( increment the number represented by the digits ).

The digits are stored such that the most significant digit is at the head of the list.

**Example:**

If the vector has `[1, 2, 3]`

the returned vector should be `[1, 2, 4]`

as `123 + 1 = 124`

.

NOTE:Certain things are intentionally left unclear in this question which you should practice asking the interviewer.

For example, for this problem, following are some good questions to ask :

Q :Can the input have 0’s before the most significant digit. Or in other words, is`0 1 2 3`

a valid input?

A :For the purpose of this question,YESQ :Can the output have 0’s before the most significant digit? Or in other words, is`0 1 2 4`

a valid output?A :For the purpose of this question,NO. Even if the input has zeroes before the most significant digit.

- Hint 1
- Hint 2
- Solution Approach
- Complete Solution

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