Examples:
Input: [2, 4, 10, 20, 5, 2, 20, 4] Output: [2, 4, 10, 20, 5] Input: [28, 42 , 28, 16, 90, 42, 42, 28] Output: [28, 42, 16, 90]
We can use not in the list, to find out duplicates. We create a list of results and only insert those that are not yet available.
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Exit:
[2, 4, 10, 20, 5]
