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Grokking the Coding Interview Patterns in C++

Solution: Single Number

Explore how to identify the single number in an array where every other element appears twice by applying bitwise XOR operations. Understand how using XOR properties helps achieve linear runtime and constant space efficiency. This lesson guides you through the algorithm, its implementation, and complexity analysis.

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Statement

Given an array of integers, where every element appears twice except for one, find the element that occurs only once.

Note: The solution must have linear runtime and constant space complexity.

Constraints:

  • 1≤1 \leq
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