How should I practice Letter Set Difference?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Bloomberg LP phone screen problems in FastPrep.

Is Letter Set Difference associated with Bloomberg LP?

FastPrep tags this as a Bloomberg LP phone screen coding practice problem when the problem catalog has that company and stage context.

Letter Set Difference

Bloomberg LP● EasyFULLTIMEPHONE SCREEN

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Problem statement

Return a string containing each distinct character that appears in exactly one of first and second, sorted by ascending character code.

Function

letterSetDifference(first: String, second: String) → String

Examples

Example 1

first = "apple"second = "pear"return = "lr"

l occurs only in apple and r only in pear; a, p, and e occur in both.

Constraints

Each string contains at most 10^5 ASCII characters.