int main ()
{
    std::unordered_map<int,int> mymap;

    mymap[100000] = 100 ;
    mymap[100001] = 500 ;
    mymap[100002] = 500 ;
    mymap[100000] = 20  ;
    mymap[100000] = 400 ;
    mymap[100004] = 1 ;

    auto x = mymap.insert( make_pair(100004,100) ) ;
    cout << "****" << x.second << "****" << endl ;
    if( !x.second){
       (x.first)->second = 123456 ;
    }

    auto y = mymap.insert( make_pair(400004,400) ) ;
    cout << "****" << y.second << "****" << endl ;
    if( !y.second){
       (y.first)->second = 78901 ;
    }

  for ( auto it = mymap.begin(); it != mymap.end(); ++it )
    std::cout << " " << it->first << ":" << it->second;
  std::cout << std::endl;

   auto got2 = mymap.find(2100000) ;
   if(got2 == mymap.end() )
       cout << "2100000 not found" << endl ;
   else
       cout << "2100000  found" << endl ;

   auto got = mymap.find(100000) ;
   if(got == mymap.end() )
       cout << "100000 not found" << endl ;
   else
       cout << "100000  found:" << got->second  << endl ;
}

****0****
****1****
 400004:400 100001:500 100002:500 100004:123456 100000:400
2100000 not found
100000  found:400

 

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