16){
system("rm -rf $basedir");
}
}
$sql="delete FROM `problem` WHERE `problem_id`=?";
pdo_query($sql,$id) ;
$sql="select max(problem_id) FROM `problem`" ;
$result=pdo_query($sql);
$row=$result[0];
$max_id=$row[0];
$max_id++;
if($max_id<1000)$max_id=1000;
$sql="ALTER TABLE problem AUTO_INCREMENT = $max_id";
pdo_query($sql);
?>