easyStringsPattern: Hashing
Unique Identifier Counting Solution
Problem Statement
Given an array of unique identifiers, write a function to calculate the number of distinct identifiers.
Examples
Example 1:
Input:["[\"apple\", \"banana\", \"cat\", \"dog\"]",4]
Output:4
Explanation: There are 4 unique identifiers in the input array.
Example 2:
Input:[["hello","world","a","b","c"],5]
Output:5
Explanation: All identifiers in the input array are unique.
Example 3:
Input:[["apple","banana","banana","dog"],4]
Output:3
Explanation: There are 3 unique identifiers in the input array.
Constraints
- Input array can be empty or have varying lengths.
- Identifiers can be strings or integers.
- Function should be case sensitive for string identifiers.
Time: O(n) Space: O(n)
This problem can be efficiently solved using a HashSet data structure, taking advantage of O(1) average time complexity for element insertions and lookups.
Run, Test & Submit Code
Ready to practice this challenge? Launch our interactive compilation environment with compiler validation.
Solve on Interactive WorkspaceTested Solutions
No solution code is currently loaded.
Complete this code in the workspace editor.