grader_Anna.cpp: In function ‘int main(int, char**)’:
grader_Anna.cpp:37:13: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
   37 |   argv[2] = "/dev/null";
      |             ^~~~~~~~~~~
/usr/bin/ld: /tmp/ccQeX2O7.o: in function `main':
grader_Anna.cpp:(.text.startup+0x14f): undefined reference to `InitA(int, int, int)'
/usr/bin/ld: grader_Anna.cpp:(.text.startup+0x2a8): undefined reference to `ReceiveA(bool)'
/usr/bin/ld: grader_Anna.cpp:(.text.startup+0x388): undefined reference to `Answer()'
collect2: error: ld returned 1 exit status