Doubt on rotate image question

#1

how are you using swap directly ?
is it a defined fuction ? or predefined ?

#2

swap function is available in C++ STL in the header file
you can read about it here:
http://www.cplusplus.com/reference/algorithm/swap/

#3

hey @mehulbhandari358 if your doubt is solved, please mark it as resolved

#4

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