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The best on-line free resource to learn C++ is https://www.learncpp.com/

For a book, IMO the best to learn from is Ivor Horton's Beginning C++: From Novice To Professional...

Sorry my bad - I blame not enough coffee! When I was going through the original code I misread one line and used 8 instead of v.size() - 1.

I've also changed in main re detecting no move possible...

As an example of using std::unordered_set consider:



#include <iostream>
#include <unordered_set>

struct Pos {
int i {};
int j {};

You need to maintain a container of already visited locations. I'd suggest a std::unordered_set

https://cplusplus.com/reference/unordered_set/unordered_set/

insert only works if the value to be...

Then you need to use the debugger to trace through the code to see where is the issue.

When I ran the code, I was getting -ve values for moved to in disp().



Moved to (11,1)

Total moves :...

There are various issues with variables being defined at global or function level and then at local scope level.

As a start, this revised c++ code compiles cleanly. If it now doesn't work as...

The original question was



When signed/unsigned operations are mixed, the signed will always be 'promoted' to unsigned. Then the operation is performed. This automatic promotion is often...

[also asked here https://cplusplus.com/forum/windows/283922/ ]

Just trying to help... Some aspects of C++ can be confusing/bewildering (add your own adjective!).

... but that would require the OP to actually do some work as opposed to being spoon-fed!

Several of the std::algorithm functions work in the same way. eg sort()

It depends upon how the program has been coded. If it is coded as a multi-threaded program, then the number of threads used is dependent upon how the program uses threads. It might be coded to just...

Whatever the default constructor does - if the class has no member variables then nothing.



std::max (along with most other algorithms) is template based. See...

It could be by someone who knows both C++ and Java. However I doubt that anyone looking at this thread with the requisite skills will actually do this 'ex gratia'. This forum isn't for getting work...

Yes. It's a class name. What happens 'under the hood' is that the supplied class is instantiated using the default constructor and then from that object the operator() function is called with the...

which is operator

That is a ComplexComparer constructor that takes 2 args. If ComplexComparer had such a constructor it would be called first with the given constructor args, Then the operator() would be called with...

Through the operator() which takes 2 args.

std::max calls operator() [the same as other functions that call functors]. The passed args to operator() are a and b from std::max()

Have you tried installing the Intellisense Extender as an extension? It provides additional info re potential code issues.

Well either it's a really boring party or this thread isn't meeting it's objectives........

#include <iostream>
#include <iomanip>

bool checkPalindrome(unsigned original) {
unsigned reverseNum {};

for (auto tempOriginal {original}; tempOriginal > 0; tempOriginal /= 10)...

We've all made stupid mistakes at least once, twice...

Do you mean file permissions or file attributes? These are quite different.

See https://docs.microsoft.com/en-us/visualstudio/releases/2022/release-notes-preview