[洛谷日报#265]关于 C++ 未定义行为的一些事
Q：萌新求助，为啥不开
-O2能 AC，开了-O2就 RE/TLE/WA 了？A：你的程序可能有 ...
Blowing up unordered_map, and how to stop getting hacked on it
C++ has always had the convenient data structures std::set and std::map, which...
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