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https://www.think-cell.com/en/career/devblog/cpp-needs-undefined-behavior-but-maybe-less
https://www.cl.cam.ac.uk/~nk480/C1819/lecture10.pdf
https://devblogs.microsoft.com/oldnewthing/20240802-00/?p=110091
https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list
https://stackoverflow.com/questions/2397984/undefined-unspecified-and-implementation-defined-behavior
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https://www.geeksforgeeks.org/cpp/multimap-associative-containers-the-c-standard-template-library-stl/
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