How do i take level order input for binary tree?

#1

1 2 3 4 5 6 -1 -1 -1 -1 -1 -1 -1
How do I take this input?

#2

Parent for a vertex lies at index i / 2 , children of the vertex lie at indices 2 * i + 1 and 2 * i + 2 in 0 based indexing.

#3

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