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42 lines
758 B
Markdown
42 lines
758 B
Markdown
# single-number
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Created by [@theoludwig](https://github.com/theoludwig) on 21 August 2023.
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## Instructions
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Given a **non-empty** array of integers, every element appears twice except for one. Find that single one.
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You must implement a solution with a linear runtime complexity and use only constant extra space.
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### Constraints
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- $$1 \leq numbers.length \leq 3 \times 10^4$$
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- $$-3 \times 10^4 \leq numbers[index] \leq 3 \times 10^4$$
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- Each element in the array appears twice except for one element which appears only once.
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## Source
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[LeetCode - Single Number](https://leetcode.com/problems/single-number/)
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## Examples
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See the `test` folder for examples of input/output.
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### Example 1
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#### Input
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```txt
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4
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1
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2
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1
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2
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```
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#### Output
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```txt
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4
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```
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