Question

map<string ,vector<string> > hashes;

hashes.insert(pair<string,vector<string> > (a,b ));  //error coming

What is the problem coming when i am using the above statement in C++, where a and b are strings?
How does the insertion takes place in this type (i.e. one container containing more container) of associative container?

Many many thanx in advance

Answer 1

You probably want

hashes[a].push_back(b)

That’s if you want b to be appended to the present vector. If you want it to replace it, use

hashes[a].assign(1, b)