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Count Unique Identifiers Solution

Problem Statement

You are given a list of identifiers, determine the total number of unique identifiers and the number of duplicates.

Example 1
Input
{"identifiers":[1223444]}
Output
{"uniqueCount":4,"duplicateCount":3}

Explanation: Corrected duplicate count from 4 to 3, since there are 4 unique identifiers and the duplicates are 2 (for identifier 2) and 3 (for identifier 4)

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