Question

I want to create a structure that holds distinct strings and assign to each one of them some (not one unique) int values. After I have filled that structure, I want to check for each string how many different int have been assigned to and which exactly are they. I know that it is possible to tackle this with a multimap. However I am not sure if (or how) it is possible to get all the distinct strings contained to the multimap, since the function “find” requires a parameter for matching, while I do not know when searching which distinct values could be in the multimap. How could this be done with a multimap?

As an alternative solution I tried to use a simple map with a vector as value. However I still cannot make this work because the iterator of the vector does not seem to be recognized and it indicates me : iterator must a have a pointer to class type.

map<string, vector<int>>::iterator multit;
int candID1, candID2, candID3;

for(multit=Freq.begin(); multit!=Freq.end(); multit++)
{
    if((*multit).second.size()==3)
    {
        vector<int> vectorWithIds = (*multit).second;

        for(vector<int>::iterator it = vectorWithIds.begin();
            it != vectorWithIds.end();it++)
        {
            candID1 = it->        Problem: The iterator is not recognized
        }
    }

}

Could anyone detect the problem? Is there an attainable solution, either on the first or the second way?

Answer 1

What is it->? It’s vector if ints, you probably want *it.

P.S. I have to admit I haven’t read the whole prose.