COMPARATOR FUNCTIONS, PAIR DATATYPE ,CONVERTOINT FUNCTION

#1

THE COMPARATOR FUNCTIONS RE QUITE DIFFICULT nd i have seen the video many a times , still im not able to understand. ND WHAT IS THE PAIR datatype.Also in Converttoint function when we did
ans+=((str[i]-‘0’)*p); ,what is str[i]-‘0’.

#2

Hey @dhruv.mahajan.mait

Comparator functions is just a function that takes two parameter of the same type and returns a boolean. It is used to make custom sorting operations.
Open doubts regarding what you are not able to understand exactly , comparators is a broad term.

pair datatype is a pre define class in which u can group two datatypes together
say
pair<int ,float>
pair<int,string>
pair<string,string>
etc.
To reference them say we created pair<int,string> p=make_pair(5,“Hi”);
then cout<<p.first<<" "<<p.second; this will print 5 Hi

str[i] is a character and will give corresponding ascci value as int
and we subtract ‘0’ from it to make it int
i.e ‘0’-‘0’ gives 0
‘1’-‘0’ gives 1
and so on

#3

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