For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.

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Popular Simple Open Source Online Judge based on PHP/C++/MySQL/Linux for ACM/ICPC and NOIP training, with easy installation. 简单实用的开源OJ系统

코딩테스트 대비 문제집(Baekjoon Online Judge)

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Baekjoon Online Judge Programming Problems / Solutions