Multicore programming

Question

I see from Javascript that SoloLearn playground has 8 cores:
https://code.sololearn.com/WRFqaxzxgn8S/?ref=app
Now I would like to use 8 cores even in C/CPP. Here is a trivial program for testing:
https://code.sololearn.com/cuJWVSVmb7k7/?ref=app
Unfortunately the result is only one core.
On other playgrounds you can compile with option "-fopenmp". In this way, for example, wandbox.org will show 3 cores, and tutorialspoint.com (http://tpcg.io/L5U5VL) will show as many as 32 cores!
In other words, is there some way to modify compiler options in SoloLearn playground?

Answer 1

Sadly, there is no such options as of now ... you could suggest it to the sololearn team though ! It would be nice !
I think you can use pthread though