$ ./executables/main_server.exe -R 1

Added program p1 with index 0

Added program p2 with index 1

Added program p3 with index 2

Added program p4 with index 3
Content of waiting queue:
        |--|
        |p1|
        |p2|
        |p3|
        |p4|
        |--|
Usage: ./scheduler [-SFRP][number_of_thread]

         -S      to use FS ALG.
         -F      to use FCFS ALG.
         -R      to use RR ALG.
         -P      to use PS ALG.