How should I practice Intersection of Two Arrays?

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Intersection of Two Arrays

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Problem statement

Return the distinct integers that appear in both first and second, sorted in ascending order.

Function

intersection(first: int[], second: int[]) → int[]

Examples

Example 1

first = [1,2,3,4]second = [2,4,6]return = [2,4]

Only 2 and 4 occur in both arrays.

Constraints

Each array contains at most 10^5 signed 32-bit integers.