How should I practice Character Intersection and Frequency Ordering?

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Character Intersection and Frequency Ordering

Bloomberg LP● MediumNEW GRADONSITE INTERVIEW

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Problem statement

Return a two-element array:

A string containing each distinct character present in both inputs, in first-appearance order from first.
A string containing every distinct character from both inputs ordered by descending combined frequency. Break ties by first appearance while scanning first then second.

Function

intersectionAndFrequencyOrder(first: String, second: String) → String[]

Examples

Example 1

first = "ABCEGDB"second = "ABACE"return = ["ABCE","ABCEGD"]

A and B occur three times, C and E twice, and G and D once; ties follow first appearance.

Constraints

Inputs contain ASCII characters and total length is at most 2 * 10^5.