Not able to understand how the output come

#1

not sure what does pair<set::iterator, bool> ret; this statement conveys

#2

@kartiksinghal0611 According to http://www.cplusplus.com/reference/set/set/insert/
“returns a pair, with its member pair::first set to an iterator pointing to either the newly inserted element or to the equivalent element already in the set. The pair::second element in the pair is set to true if a new element was inserted or false if an equivalent element already existed

#3

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