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Support Ukraine questions

What is the use of first template parameter in priority_queue

Support Ukraine answers

Change comparison operators without large conditional block
Why is calculation using float variable different from what I think?
Output PIN from a MAC address using char
C - Casting ~0 to unsigned long
What is a flexible array member in a struct?
copying array vs copying int cost and performance in c
C++: accessing private members of the class [closed]
Attempt to dereference a generic pointer.
How to ignore bits in a variable [closed]
How does the bit layout of the floats give me certain values after bit shifting?