LeetCode 509: Fibonacci Number - Interview Prep Ep 13

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Thanks for steping through and explaining with two approaches. I would like to ask you four questions regarding int[ ] = fibNums = new int[n + 1]; .

(1) May I know why you add 1 to n. Is it because array index starts from 0??

(2) Approach 1 Array - space complexity - O(n) - is it because you initialise fibNums Array and the size is n (stored in Heap memory)?

(3) fibNums[1] = 1, why don't you initialise fibNums[0] = 0?

(4) I think both approaches are iterative?? Thanks!

ktsuw_