I keep getting this error message $?$ It doesnt seem like the input file is being read properly.

#include

#include

#include $//$ For random numbers

#include $//$ For srand, rand

using namespace std;

$//$ Node struture for $2$D linked list grid

struct Node $\{$

int value;

Node$*$ right;

Node$*$ down;

Node$($int val $=0)$ : value$($val$),$ right$($nullptr$),$ down$($nullptr$)\{\}$

$\}$;

$//$ LinkedList class that manags the $2$D grid

class LinkedList $\{$

private:

Node$*$ head;

int rows, cols;

public:

LinkedList$()$ : head$($nullptr$),$ rows$(0),$ cols$(0)\{\}$

$//$ Destrctor to free memory when the object is destroyd

~LinkedList$()\{$

clearList$()$;

$\}$

$//$ Initilize the list from a file input

void inputList$($const string& filename $)\{$

ifstream file$("$GridNumbers$.$txt$")$;

if $(!$file$)\{$

cout $$ "Error: Unable to open file." $$ endl;

return;

$\}$

file $>>$ rows $>>$ cols;

Node$*$ prevRowHead $=$ nullptr;

Node$*$ prev $=$ nullptr;

for $($int i $=0$; i $$ rows; $++$i$)\{$

Node$*$ currentRowHead $=$ nullptr;

for $($int j $=0$; j $$ cols; $++$j$)\{$

int value;

file $>>$ value;

Node$*$ newNode $=$ new Node$($value$)$;

if $($j $==0)$ currentRowHead $=$ newNode;

if $($i $==0$ && j $==0)$ head $=$ newNode;

if $($prev$)$ prev$->$right $=$ newNode;

if $($prevRowHead$)\{$

prevRowHead$->$down $=$ newNode;

prevRowHead $=$ prevRowHead$->$right;

$\}$

prev $=$ newNode;

$\}$

prev $=$ nullptr;

prevRowHead $=$ currentRowHead;

$\}$

file.close$()$;

$\}$

$//$ Print the grid neatly

void printList$()$ const $\{$

Node$*$ row $=$ head;

while $($row$)\{$

Node$*$ col $=$ row;

while $($col$)\{$

cout $$ col$->$value ;

col $=$ col$->$right;

$\}$

cout $$ endl;

row $=$ row$->$down;

$\}$

$\}$

$//$ Get the value at a speciific row & column

int getItem$($int row, int col$)$ const $\{$

Node$*$ current $=$ head;

for $($int i $=0$; i $$ row && current; $++$i$)$ current $=$ current$->$down;

for $($int j $=0$; j $$ col && current; $++$j$)$ current $=$ current$->$right;

if $($current$)$ return current$->$value;

return $-1$; $//$ Invaliid index

$\}$

$//$ Set the value at a specifiic row & column

void setItem$($int row, int col, int value$)\{$

Node$*$ current $=$ head;

for $($int i $=0$; i $$ row && current; $++$i$)$ current $=$ current$->$down;

for $($int j $=0$; j $$ col && current; $++$j$)$ current $=$ current$->$right;

if $($current$)$ current$->$value $=$ value;

$\}$

$//$ Clear entire grid & free memory

void clearList$()\{$

Node$*$ row $=$ head;

while $($row$)\{$

Node$*$ col $=$ row;

while $($col$)\{$

Node$*$ temp $=$ col;

col $=$ col$->$right;

delete temp;

$\}$

Node$*$ temp $=$ row;

row $=$ row$->$down;

delete temp;

$\}$

head $=$ nullptr;

rows $=0$;

cols $=0$;

$\}$

$//$ Get no$.$ of rows

int getRows$()$ const $\{$ return rows; $\}$

$//$ Get no$.$ of columns

int getCols$()$ const $\{$ return cols; $\}$

$\}$;

$//$ Driver function to test the LinkedList class

int main$()\{$

srand$($time$(0))$; $//$ Seed for random number generation

LinkedList grid;

cout $$ "Loading the grid:

$"$;

ifstream file$("$GridNumbers$.$txt$")$;

grid.printList$()$;

cout

Testing getItem$()$:

$"$;

for $($int i $=0$; i $<mtext></mtext><mn>5</mn>$; $++$i$)\{$

int row $=$ rand$()\%$ grid.getRows$()$;

int col $=$ rand$()\%$ grid.getCols$()$;

cout $$ "The element at $("$ row col is $"$

$$ grid.getItem$($row$,$ col$)$ endl;

$\}$

cout

Testing setItem$()$:

$"$;

for $($int i $=0$; i $<mtext></mtext><mn>5</mn>$; $++$i$)\{$

int row $=$ rand$()\%$ grid.getRows$()$;

int col $=$ rand$()\%$ grid.getCols$()$;

int newValue $=$ rand$()\%100$;

cout $$ "Changing element at $("$ row col to $"$

$$ newValue $$ endl;

grid.setItem$($row$,$ col, newValue$)$;

$\}$

grid.printList$()$;

cout

Deleting the grid:

$"$;

grid.clearList$()$;

grid.printList$()$;

return $0$;

$\}$

$//$Here is the input file $?$

$55$

$3931909038$

$7630538628$

$7020396676$

$7424705150$

$3488802533$