[CutX]

instead of always

PHP код:

if(listitem == 0)
if(listitem == 1)
if(listitem == 2) 


do:

PHP код:

if(listitem == 0)
else if(listitem == 1)
else if(listitem == 2) 


but you could also use a switch, which would be the best + fastest solution for this

PHP код:

switch(listitem)
{
    case 0: 
    {
    //your code
    }
    case 1:
    {
    //your code
    }
    case 2:
    {
    //your code
    }
} 


also, i'd recommend defining your Dialog id's lie this:

PHP код:

//on top of your script
#define DM_DIALOG 1
#define SOME_DIALOG 2
#define SOME_LIST 3
//and so on, for all your dialogs 


then instead of 1, you write DM_DIALOG:
ShowPlayerDialog(playerid, DM_DIALOG, DIALOG_STYLE_LIST,"Deathmatch Game","1.Terrorist\n2.Counter-Terrorist\n3.Exit Deathmatch", "Apply", "Close");

and in ondialogresponse too:
if(dialogid == DM_DIALOG)