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Arik Chakma 274082fd77 feat: clean roadmap content and sync scripts (#10181) 
* refactor: clean to roadmap content

* refactor: move shared helpers into scripts/lib
2026-07-28 05:45:17 +06:00

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Single Number

Given an array where every element appears twice except one, find the element that appears only once. XOR of a number with itself is zero, and XOR of a number with zero is the number itself, so XOR-ing all elements cancels duplicates and leaves the unique one. This problem is the entry point to bit manipulation and teaches you that XOR is a surprisingly powerful tool for finding missing or unique values.

Visit the following resources to learn more:

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