Solution: Single Number II
Understand how to identify two unique elements in a non-empty array where every other element appears twice. Explore a constant space solution using bitwise XOR to separate and find these unique numbers efficiently with O(n) time complexity.
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We'll cover the following...
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:
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