[TheXIII]

pawn Код:

new NonZombieCount;
#define MIN_NONZOMBIES 3
foreach( Player, i )
{
    if( PlayerTeam[i] != ZOMBIE_TEAM ) NonZombieCount++;
    if( NonZombieCount >= MIN_NONZOMBIES ) break;
}
if( NonZombieCount >= MIN_NONZOMBIES )
{
    new PlayersAssigned, pID;
    do{
        pID = Iter_Random(Player);
        if( PlayerTeam[pID] == ZOMBIE_TEAM )
        {
            PlayerTeam[pID] = HUMAN_TEAM;
            PlayersAssigned++;
        }
    }
    while( PlayersAssigned >= MIN_NONZOMBIES );
}
#undef MIN_NONZOMBIES

Something like that.

EDIT: Sorry, just woke. Gimme a sec.
EDIT2:

pawn Код:

new NonZombieCount;
foreach( Player, i )
{
    if( PlayerTeam[i] != ZOMBIE_TEAM ) NonZombieCount++;
}
if( !NonZombieCount )
{
    new PlayersAssigned, pID;
    do{
        pID = Iter_Random(Player);
        if( PlayerTeam[pID] == ZOMBIE_TEAM )
        {
            PlayerTeam[pID] = HUMAN_TEAM;
            PlayersAssigned++;
        }
    }
    while( PlayersAssigned >= MIN_NONZOMBIES );
}