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Grokking the Coding Interview Patterns in C#

Solution: Single Number

Explore how to efficiently identify the element that appears once in an array where all other elements appear twice. Understand the properties of bitwise XOR, implement an O(n) time and O(1) space solution, and apply this technique to solve similar coding interview problems.

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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 nums.length ≤103\leq10^3
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