Get-5Accounts-With_Max._Contacts

public class CheckMaxcount{
    
    public static void ProcessToMax(){
        
        map<String,String> mapStoreAgg = new map<String,String>();
        
        list<AggregateResult> lstAgg= new list<AggregateResult>();
        lstAgg=[select Count(Id) ct,AccountId acId from Contact Group By AccountId ORDER By Count(Id) DESC Limit 5];
        
        if(lstAgg.size()>0){
            
            for(AggregateResult agg:lstAgg){
                Id AccId=(Id)agg.get('acId');
                Integer count = (INTEGER)agg.get('ct');
                mapStoreAgg.put('Account Id: '+AccId,' & No.of Contacts: '+count);
            }
        }
        if(mapStoreAgg.size()>0){
            system.debug('@@@@ mapStoreAgg: '+mapStoreAgg);
        }
    }
    
}