mediumArrays
Identify Unique Identifier Solution
Problem Statement
You are given an array of integers `ids` containing unique and duplicate identifiers. Write a function to determine whether a given identifier `target_id` is new or exists in the array.
Examples
Example 1:
Input:{"ids":[1,2,3,4,5],"target_id":6}
Output:true
Example 2:
Input:{"ids":[1,2,3,4,5],"target_id":3}
Output:false
Time: O(N) Space: O(1)
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