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Grokking the Coding Interview Patterns

Solution: Single Number

Understand how to efficiently identify the single number in an array where every other element appears twice by applying bitwise XOR operations. Explore the XOR properties to eliminate duplicates with linear runtime and constant space complexity. This lesson equips you to solve this classic problem using bitwise manipulation techniques effectively.

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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\leq 10^3
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