NiuNiu MaTe

Dec 18, 2021 · Fundamentals

What’s the Real Range of Tencent QQ Numbers and How Bitmap Handles Their Deduplication?

This article explains the theoretical and practical range of Tencent QQ numbers, why the lower limit is set to 10001, how unused accounts are reclaimed, and demonstrates how bitmap techniques can efficiently deduplicate billions of QQ IDs using simple C++ code.