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Grokking the Coding Interview Patterns in Python

Solution: Single Number II

Explore the bitwise XOR technique to find two unique numbers in an array where all other elements appear twice. Understand the steps to separate these numbers using the rightmost set bit approach, and practice optimizing for constant space and linear time complexity.

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Statement

Given a non-empty array arr, in which exactly two elements appear once, and all the other elements appear twice, return the two elements that appeared only once.

Note: The result can be returned in any order. The solution should use only constant extra space.

Constraints:

  • 2≤2 \leq arr.length ≤103\leq 10^3

  • ...