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Deduplicate a List While Preserving Order

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Problem statement

You are given an integer array values.

Return a new array containing each distinct value exactly once. Preserve the order in which values first appear.

Function

deduplicateList(values: int[]) → int[]

Examples

Example 1

values = [4,2,4,1,2,3]return = [4,2,1,3]

Keep the first occurrence of each value and discard later duplicates.

Example 2

values = [-1,-1,0,-1,0]return = [-1,0]

The first -1 and the first 0 determine the output order.

Example 3

values = [7]return = [7]

A one-element array is already distinct.

Constraints

1 <= values.length <= 10^5.
-10^9 <= values[i] <= 10^9.