[Vince]

pawn Код:

new Iterator:Terrorists<MAX_PLAYERS>;

pawn Код:

Iter_Add(Terrorists, playerid);
// instead of:
gTeam[playerid] = Terrorists;

pawn Код:

Iter_Remove(Terrorists, playerid);
// instead of:
gTeam[playerid] = 0; // (or NO_TEAM)

pawn Код:

foreach(Terrorists, i)
{
    SendClientMessage(i, -1, "You are a terrorist.");
}

pawn Код:

new random_terrorist = Iter_Random(Terrorists);

I'm not sure if foreach guards against duplicate values, but if you're uncomfortable you can check with Iter_Contains before adding the player.