[suhrab_mujeeb]

Try this

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pawn Код:

new players, cop, terrorist;

pawn Код:

public OnPlayerConnect(playerid)
{
    players++;
    return 1;
}   

public OnPlayerDisconnect(playerid)
{
    players--;
    if(GetPlayerTeam(playerid) == TEAM_COPS)
    {
        cop--;
    }
    else if(GetPlayerTeam(playerid) == TEAM_TERRORISTS)
    {
        terrorist--;
    }
    return 1;
}

pawn Код:

public OnPlayerRequestClass(playerid, classid)
{
    new _limit = (players/2), bool:limit;
    if(terrorist >= _limit || cop >= _limit)
    {
        limit = true;
    }
    else
    {
        limit = false;
    }
    if(classid == TEAM_COPS && limit == true) return SendClientMessage(playerid, 0xFF0000, "That team is full!");
    else
    {
        cop++;
    }
    if(classid == TEAM_TERRORISTS && limit == true) return SendClientMessage(playerid, 0xFF0000, "That team is full!");
    else
    {
        terrorist++;
    }
    return 1;
}

Always try to use SetPlayerTeam with this