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1 Explanationhttps://en.cppreference.com/cpp/language/ub#Explanation
2 UB and optimizationhttps://en.cppreference.com/cpp/language/ub#UB_and_optimization
2.1 Signed overflowhttps://en.cppreference.com/cpp/language/ub#Signed_overflow
2.2 Access out of boundshttps://en.cppreference.com/cpp/language/ub#Access_out_of_bounds
2.3 Uninitialized scalarhttps://en.cppreference.com/cpp/language/ub#Uninitialized_scalar
2.4 Invalid scalarhttps://en.cppreference.com/cpp/language/ub#Invalid_scalar
2.5 Null pointer dereferencehttps://en.cppreference.com/cpp/language/ub#Null_pointer_dereference
2.6 Access to pointer passed to std::reallochttps://en.cppreference.com/cpp/language/ub#Access_to_pointer_passed_to_std::realloc
2.7 Infinite loop without side-effectshttps://en.cppreference.com/cpp/language/ub#Infinite_loop_without_side-effects
3 Ill-formed with diagnostic messagehttps://en.cppreference.com/cpp/language/ub#Ill-formed_with_diagnostic_message
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C documentationhttps://en.cppreference.com/c/language/behavior
The LLVM Project Blog: What Every C Programmer Should Know About Undefined Behavior #1/3https://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html
The LLVM Project Blog: What Every C Programmer Should Know About Undefined Behavior #2/3https://blog.llvm.org/2011/05/what-every-c-programmer-should-know_14.html
The LLVM Project Blog: What Every C Programmer Should Know About Undefined Behavior #3/3https://blog.llvm.org/2011/05/what-every-c-programmer-should-know_21.html
Undefined behavior can result in time travel (among other things, but time travel is the funkiest)https://devblogs.microsoft.com/oldnewthing/20140627-00/?p=633
Understanding Integer Overflow in C/C++https://www.cs.utah.edu/~regehr/papers/overflow12.pdf
Fun with NULL pointers, part 1https://lwn.net/Articles/342330/
Undefined Behavior and Fermat’s Last Theoremhttps://web.archive.org/web/20201108094235/https://kukuruku.co/post/undefined-behavior-and-fermats-last-theorem/
C++ programmer's guide to undefined behaviorhttps://pvs-studio.com/en/blog/posts/cpp/1129/
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