[SickAttack]

This should work for what you want to do:

pawn Код:

// [ DEVELOPMENT GAMEMODE ]

// RULES:

#pragma dynamic 1000000

// INCLUDES:

#include <a_samp>
#include <sscanf2>
#include <zcmd>

// DEFINES:

#define MAX_NUMBERS 899999
#define OFFSET 100000

// VARIABLES:

new bool:gNumbers[MAX_NUMBERS] = false;

// MAIN:

main()
{
    print("Development Mode: random_not_taken.amx");
}

// CALLBACKS:

public OnGameModeInit()
{
    return 1;
}

public OnGameModeExit()
{
    return 1;
}

// COMMANDS:

CMD:add(playerid, params[])
{
    new index;
    if(sscanf(params, "i", index)) return SendClientMessage(playerid, -1, "Usage: /add (index).");
    if(gNumbers[index]) return SendClientMessage(playerid, -1, "Index is already in use.");
    if(index < 0 || index >= MAX_NUMBERS) return SendClientMessage(playerid, -1, "You have entered an invalid index.");

    gNumbers[index] = true;

    new string[128];
    format(string, sizeof(string), "%d has been marked as taken.", index + OFFSET);
    SendClientMessage(playerid, -1, string);
    return 1;
}

CMD:remove(playerid, params[])
{
    new index;
    if(sscanf(params, "i", index)) return SendClientMessage(playerid, -1, "Usage: /remove (index).");
    if(!gNumbers[index]) return SendClientMessage(playerid, -1, "Index is not in use.");
    if(index < 0 || index >= MAX_NUMBERS) return SendClientMessage(playerid, -1, "You have entered an invalid number.");

    gNumbers[index] = false;

    new string[128];
    format(string, sizeof(string), "%d has been marked as available.", index + OFFSET);
    SendClientMessage(playerid, -1, string);
    return 1;
}

CMD:random(playerid, params[])
{
    new string[128], tick[2], number;
    tick[0] = GetTickCount();
    number = RandomNotTaken();
    tick[1] = GetTickCount();

    format(string, sizeof(string), "Number %d is a free non-taken number (%d ms).", number, tick[1] - tick[0]);
    SendClientMessage(playerid, -1, string);
    return 1;
}

// FUNCTIONS:

stock RandomNotTaken()
{
    new free_numbers[MAX_NUMBERS], count;
    for(new i = 0; i < MAX_NUMBERS; i ++)
    {
        if(!gNumbers[i])
        {
            free_numbers[count] = i;
            count ++;
        }
    }

    new selected = free_numbers[random(count)] + OFFSET;
    return selected;
}

Test with 5 numbers:

pawn Код:

// [ DEVELOPMENT GAMEMODE ]

// INCLUDES:

#include <a_samp>
#include <sscanf2>
#include <zcmd>

// DEFINES:

#define MAX_NUMBERS 5

// VARIABLES:

new bool:gNumbers[MAX_NUMBERS] = false;

// MAIN:

main()
{
    print("Development Mode: random_not_taken.amx");
}

// CALLBACKS:

public OnGameModeInit()
{
    return 1;
}

public OnGameModeExit()
{
    return 1;
}

// COMMANDS:

CMD:add(playerid, params[])
{
    new index;
    if(sscanf(params, "i", index)) return SendClientMessage(playerid, -1, "Usage: /add (index).");
    if(gNumbers[index]) return SendClientMessage(playerid, -1, "Index is already in use.");
    if(index < 0 || index >= MAX_NUMBERS) return SendClientMessage(playerid, -1, "You have entered an invalid index.");

    gNumbers[index] = true;

    new string[128];
    format(string, sizeof(string), "%d has been marked as taken.", index);
    SendClientMessage(playerid, -1, string);
    return 1;
}

CMD:remove(playerid, params[])
{
    new index;
    if(sscanf(params, "i", index)) return SendClientMessage(playerid, -1, "Usage: /remove (index).");
    if(!gNumbers[index]) return SendClientMessage(playerid, -1, "Index is not in use.");
    if(index < 0 || index >= MAX_NUMBERS) return SendClientMessage(playerid, -1, "You have entered an invalid number.");

    gNumbers[index] = false;

    new string[128];
    format(string, sizeof(string), "%d has been marked as available.", index);
    SendClientMessage(playerid, -1, string);
    return 1;
}

CMD:random(playerid, params[])
{
    new string[128];
    format(string, sizeof(string), "Number %d is a free non-taken number.", RandomNotTaken());
    SendClientMessage(playerid, -1, string);
    return 1;
}

// FUNCTIONS:

stock RandomNotTaken()
{
    new free_numbers[MAX_NUMBERS], count;
    for(new i = 0; i < MAX_NUMBERS; i ++)
    {
        if(!gNumbers[i])
        {
            free_numbers[count] = i;
            count ++;
        }
    }

    new selected = free_numbers[random(count)];
    return selected;
}