How should I practice Count Values Appearing Exactly Once?

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

Is Count Values Appearing Exactly Once associated with Agoda?

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

Agoda● EasyFULLTIMEPHONE SCREEN

Given an integer array nums, return how many distinct values occur exactly once in the array.

A value contributes one to the answer only when its total frequency is one. Values that occur two or more times do not contribute.

countAppearingOnce(nums: int[]) → int

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

Only 2 and 3 appear exactly once.

nums = [7,7,7]return = 0

The only value occurs three times.

nums = [-1,0,5]return = 3

Every value occurs once.