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Function with recursion is causing stack overflow


Function with recursion is causing stack overflow

By : 12jquiro
Date : November 22 2020, 03:01 PM
may help you . You cannot use "less stack space" for the simple reason that when the amount of required stack space is infinite, anything less than infinite is still infinite. That's what infinity means. The shown algorithm is logically flawed, and clearly results in infinite recursion. Let's label some of these recursive calls as follows:
code :
if (this->check(maze, path, x + 1, y, z) ||   // A
    this->check(maze, path, x, y + 1, z) ||   // B
    this->check(maze, path, x, y, z + 1))     // C
{
    checking++;
}

if (this->check(maze, path, x - 1, y, z) && checking == 1) // D
{
    checking++;
}


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Infinite recursion in IO wrapped with StateT causing stack space overflow

Infinite recursion in IO wrapped with StateT causing stack space overflow


By : user3616012
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Update: I wasn't able to reproduce the issue, different GHC versions might optimize code differently. Nevertheless some ideas below:
The forced evaluation you added doesn't do anything - it's never executed, as problem runs indefinitely.
code :
 import Control.Monad
 import Control.Monad.IO.Class
 import Control.Monad.RWS.Strict

 import Control.Exception (evaluate)
 import Control.DeepSeq

 import qualified Data.Sequence as Seq

 type ContextT s m = RWST () (Seq.Seq String) s m

 evaluate' :: (MonadIO m, NFData a) => a -> m a
 evaluate' = liftIO . evaluate . force

 forever' :: (MonadIO m, NFData s) => ContextT s m a -> ContextT s m b
 forever' k = RWST $ \_ -> loop mempty
   where
     loop w s = do
         (_, s', w') <- runRWST k () s
         let w'' = w <> w'
         evaluate' s'
         evaluate' w''
         loop w'' s'

 evalContext ctx state = do
   (a, _, _) <- runRWST ctx () state
   return a

 problem :: ContextT Double IO ()
 problem = do modify (+ 0.001)
              s <- get
              liftIO $ print s

 main :: IO ()
 main = evalContext (forever' problem) 0
newtype ContextT m a = ...
forceContext :: ContextT IO () -- or MonadIO m => ContextT m ()
forceContext = do
  -- state
  s <- -- read the internal state
  liftIO $ evaluate (rnf s)
  ...
main = runContextT (forever (step >> forceContext))
JPA many-to-many relationship causing infinite recursion and stack overflow error

JPA many-to-many relationship causing infinite recursion and stack overflow error


By : Matt Wescott
Date : March 29 2020, 07:55 AM
I wish this help you Every time you have @OneToMany (a collection) you need to add @JsonIgnore to it or else it will cause an infinite loop which results in a stack overflow exception because it keeps looking up between the parent(the one side) and the child (the many side) For more info on dealing with this kind of problems check this excellent article http://www.baeldung.com/jackson-bidirectional-relationships-and-infinite-recursion
Recursion in Mybatis SQL causing stack overflow while compile

Recursion in Mybatis SQL causing stack overflow while compile


By : Mayank Goyal
Date : March 29 2020, 07:55 AM
I hope this helps you . This does not work because include element does not support recursion, that is you can't include the sql snippet from itself.
If you switch to velocity scripting engine you can implement what you need with a macro that is allowed to reference itself.
code :
public class A {
  Integer id;
  String op;
  Integer val;
  List<A> nodes;
  // setters/getters omitted for brevity
class MyMapper {
   Integer getRecursive(@Param("A") A a);
}
<select id="getRecursive" lang="velocity" resultType="int">
    #macro(node $a)
        #if( ! $a.op )
            SELECT sum(val) as val FROM A
            WHERE id = ${a.id} 
        #else
            SELECT
            #if( $a.op == "AND" )
                max(val) as val
            #else
                min(val) as val
            #end
            FROM (
                #repeat( $a.nodes $aNode "UNION ALL" )
                   #node($aNode)
                #end
            )
        #end
    #end

    select val FROM (
        #node($_parameter.A)
    )
</select>
@Test
public void testRecursive() {
    A a = or(leaf(1), and(leaf(2), leaf(3)));
    assertThat(sut.getRecursive(a), equalTo(1));
}

private A leaf(int id) {
    A a = new A();
    a.setId(id);
    return a;
}

private A or(A ... ops) {
    return operation("OR", ops);
}

private A and(A ... ops) {
    return operation("AND", ops);
}

private A operation(String operation, A ... ops) {
    A a = new A();
    a.setOp(operation);
    a.setNodes(Arrays.asList(ops));
    return a;
}
Why is this power function causing a stack overflow c#

Why is this power function causing a stack overflow c#


By : Adnan Irfan
Date : March 29 2020, 07:55 AM
hop of those help? Your Math.Ceiling(n/2) case will never call pow with n == 0 because Math.Ceiling(1/2) == 1. Once your pow2 is called with n == 1 the next two calls will be:
Function Parameters Causing Stack Overflow?

Function Parameters Causing Stack Overflow?


By : Challa
Date : March 29 2020, 07:55 AM
I hope this helps you . Probably because you pass some of the parameters (mainmenu1, textDisplay16, textDisplay17) by value rather than by reference.
These parameters may contain huge data in them (i.e. a string of millions characters, or a list of million items). This also can be due to a bug.
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