[TheToretto]

Why the value is set to -1 ? It should be simply 0, and yes your code is correct @RJTabish, (except your indentation..) but don't forget to add every exception, such as OnPlayerDeath, then, OnPlayerDisconnect, you will have to check if he is in the game or not, add a boolean variable for that:

pawn Код:

new    
    CountPUBGPlayers,
    bool:gInGame[MAX_PLAYERS]; 

CMD:enter(playerid) 
{
    if(gInGame[playerid]) return 1;
    gInGame[playerid] = true;
    CountPUBGPlayers++;
    UpdateAliveTD();
    return 1; 
}


CMD:exit(playerid) 
{ 
    if(!gInGame[playerid]) return 1;
    gInGame[playerid] = true;
    CountPUBGPlayers--;
    UpdateAliveTD();
    return 1; 
}

public OnPlayerDisconnect(playerid, reason)
{
    cmd_exit(playerid);
    return 1;
}

public OnPlayerDeath(playerid, killerid, reason)
{
    cmd_exit(playerid);
    return 1;
}

UpdateAliveTD()
{
    new string[10]; 
    format(string, sizeof string, "%d alive", CountPUBGPlayers); 
    TextDrawSetString(Textdrawpubg100, string);
    return 1;
}