Write a program $($in main.cpp$)$ that:

Prompts the user for a filename containing node data.

Outputs the nodes of a graph in a depth first traversal.

info$>$Note: Files Ch$20\_$Ex$13$Data.txt and Ch$20\_$Ex$1$Data.txt contain node data that you may test your program with.

Here is my code:

main.cpp

#include

#include

#include

#include

using namespace std;

void depthFirstTraversal$($const vector$>$& graph, int start$)\{$

vector visited$($graph$.$size$(),$ false$)$;

stack s;

s$.$push$($start$)$;

while $(!$s$.$empty$())\{$

int node $=$ s$.$top$()$;

s$.$pop$()$;

if $(!$visited$[$node$])\{$

cout $$ node ;

visited$[$node$]=$ true;

for $($int neighbor : graph$[$node$])\{$

if $(!$visited$[$neighbor$])\{$

s$.$push$($neighbor$)$;

$\}$

$\}$

$\}$

$\}$

$\}$

int main$()\{$

string filename;

cout $$ "Enter filename containing node data: $"$;

cin $>>$ filename;

ifstream inputFile$($filename$)$;

if $(!$inputFile$)\{$

cerr $$ "Error opening file." $$ endl;

return $1$;

$\}$

int numNodes;

inputFile $>>$ numNodes;

vector$>$ graph$($numNodes$)$;

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

int node;

inputFile $>>$ node;

while $($node $!=-999)\{$

graph$[$i$].$push$\_$back$($node$)$;

inputFile $>>$ node;

$\}$

$\}$

inputFile.close$()$;

cout $$ "Depth First Traversal:" $$ endl;

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

cout $$ "Starting from node $"$ i : $"$;

depthFirstTraversal$($graph$,$ i$)$;

cout $$ endl;

$\}$

return $0$;

$\}$

the code is working yet the parameter that is being asked is not being approved, please help.