Problem Statement
Find the single element in sorted array where every other element appears twice.
Approach
Check if mid is paired correctly. Single element disrupts pairing.
Time & Space Complexity
Time O(log n), Space O(1).

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Binary search on pairs to find unique element.
Find the single element in sorted array where every other element appears twice.
Check if mid is paired correctly. Single element disrupts pairing.
Time O(log n), Space O(1).
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