Playlist on Repeat

Easy

The playlist tracks lists song numbers in play order. The player is set to repeat, and the playlist will play exactly twice in a row. Return every song in the order it will be heard; the answer has length 2 * len(tracks).

Example 1

tracks=[4, 9, 2] → [4, 9, 2, 4, 9, 2]

The playlist 4, 9, 2 plays twice in a row.

Example 2

tracks=[5, 5] → [5, 5, 5, 5]

Repeats inside the playlist stay put, so there are four 5s.

Example 3

tracks=[1000] → [1000, 1000]

Constraints

1 ≤ len(tracks) ≤ 1000
1 ≤ tracks[i] ≤ 1000

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Topics

Array Simulation

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Input

tracks=[4, 9, 2]

Expected

[4, 9, 2, 4, 9, 2]

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