Programming

Hi, I am trying to use multimap of multimap, because i would like to have multiple keys like multimap[key1][key2] = value. this is happening if i use map. But when i use multimap of multimap, i have to use equal_range() to find the key in the first multimap then i am getting all the values from the second multimap using iterator. But it is getting slow for finding a value in second multimap for huge data collection. Please help me in finding in both the multiple maps faster.

Thanks for your help.

my sample code(am using GCC compiler in HPUX)

#include <iostream>
#include <string>
#include <map>
using namespace std;

typedef multimap<int, int> t_mmap_inner;
typedef t_mmap_inner::iterator it_minner;
typedef pair<t_mmap_inner::iterator,t_mmap_inner::iterator> mit_inner;
typedef multimap<string, t_mmap_inner > t_mmap_outer;
typedef t_mmap_outer::iterator it_mouter;
typedef pair<t_mmap_outer::iterator,t_mmap_outer::iterator> mit_outer;


int main() {

t_mmap_outer mmm;
t_mmap_inner mm;
mm.insert(pair<int,int>(6,5));
mm.insert(pair<int,int>(7,6));
mm.insert(pair<int,int>(7,5));
mm.insert(pair<int,int>(3,5));
cout << "inner map contains" << endl;
for (it_minner j = mm.begin(); j != mm.end(); ++j)
cout << " " << j->first << ", " << j->second << '\n';
mmm.insert(pair<string, t_mmap_inner>("ABC",mm));

mm.clear();
mm.insert(pair<int,int>(10,5));
mm.insert(pair<int,int>(7,10));
mmm.insert(pair<string, t_mmap_inner>("EFG",mm));

mm.clear();
mm.insert(pair<int,int>(7,15));
mm.insert(pair<int,int>(13,7));
mmm.insert(pair<string, t_mmap_inner>("JKL",mm));
mmm.insert(pair<string, t_mmap_inner>("ABC",mm));

//printing all the values in the outer map
for (it_mouter i = mmm.begin(); i != mmm.end(); ++i) {
cout << i->first << '\n';
for (it_minner j = i->second.begin(); j != i->second.end(); ++j)
cout << " " << j->first << ", " << j->second << '\n';
}
mit_inner mit;
it_minner itm;
it_minner itmi;

mit_outer mito;
it_mouter itmo;
//finding all the items with ABC and 7
mito = mmm.equal_range("ABC");
for (itmo=mito.first; itmo!=mito.second; ++itmo){
cout << " " << (*itmo).first << endl;
for (itm = itmo->second.begin(); itm != itmo->second.end(); ++itm){
if (itm->first==7)
cout << itm->second << endl;
}
}
mmm.clear();
return 0;
}