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What is the use of first template parameter in priority_queue

Support Ukraine answers

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?
What is the reason to initialize or assign an empty string literal to a pointer to char in C, or a pointer to const char in C++?
How to make sorting function simpler (or shorter)
What does this variable point with regard to malloc?
proper use of scanf in a while loop to validate input
Sorting a list of Strings in Alphabetical order (C)
Programme works but says "warning: integer constant is so large that it is unsigned", solution?