In line 8 bhaiya did

#1

in unordered map <string,vector>
but it should be only int because in pairing we only do with datatype .plzz elaborate it

#2

Here since one person can have many phone numbers -> so with one person multiple mapping has to be done.This is done by using an unordered map <string,vector< int >>
In pairing, you can also take the value a container apart from datatypes.

#3

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#4

i did not undrstand from line no.19 how p.first aand p.second because we never include pair stl in this how we are usin g p .first and p.second