Grokking the Coding Interview: Patterns for Coding Questions

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Two Single Numbers (medium)

Problem Statement

In a non-empty array of numbers, every number appears exactly twice except two numbers that appear only once. Find the two numbers that appear only once.

Example 1:

Input: [1, 4, 2, 1, 3, 5, 6, 2, 3, 5]
Output: [4, 6]

Example 2:

Input: [2, 1, 3, 2]
Output: [1, 3]

Constraints:

1 <= nums.length <= 3 * 10<sup>4</sup>
-3 * 10<sup>4</sup> <= nums[i] <= 3 * 10<sup>4</sup>
Each element in the array appears twice except for two element which appears only once.

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