The Clever XOR Trick: Solving Tricky Interview Questions
2025-07-03
This post unveils a clever trick using the XOR bitwise operator to solve several common interview problems. XOR possesses unique properties: identical numbers XOR to 0, different numbers XOR to a non-zero value, and the order of operations doesn't affect the outcome. Leveraging these properties, you can elegantly find missing or duplicate numbers in an array, even two missing/duplicate numbers, without resorting to complex algorithms or data structures. The post progressively explains applications of the XOR trick with code examples, offering an efficient and concise problem-solving approach.
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