Question

I’m trying to use a map within a map using the following code;

 map<map <int,int>,int > multimap;

Now I want to insert the data such that multimap[1]—>(2,3), multimap[4]—>(5,6). I have been trying to insert it the following way but i guess there is a syntax error which I can’t seem to figure out!

 multimap.insert(pair<int,pair<int,int>(2,3)>(1));

Any help will be appreciated. And after adding, how would I display the values by using an iterator?

Answer 1

If you want a multipmap then you need to use a multimap 🙂 Here is declaration and an insert statement.

typedef pair<int, int> valPair;
multimap<int, valPair> mmap;

mmap.insert(make_pair(1, make_pair(2, 3)));
mmap.insert(make_pair(1, make_pair(4, 5)));

for(multimap<int, valPair>::iterator it = mmap.begin();
    it != mmap.end(); ++it)
{
    cout << "Key: " << it->first << " Vals:(";
         << it->second.first << ", " << it->second.second << ")" << endl;
}