easyHashingPattern: Bit Manipulation / Hashing
Single Occurrence Identifier Solution
Problem Statement
You are given an array of integers `batchIds` where every element appears exactly twice except one. Find the integer that appears only once.
Examples
Example 1:
Input:[2, 2, 3, 4, 4]
Output:3
Explanation: The item with batch ID 3 appears exactly once.
Example 2:
Input:[1, 1, 2, 2, 3, 4, 4]
Output:3
Explanation: The item with batch ID 3 appears exactly once.
Constraints
- 1 <= n <= 10^5
- n is always odd.
Time: O(N) Space: O(1)
Use a hash map to count the occurrences of each batch ID in O(n) time complexity
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