grader_Anna.cpp: In function ‘int main(int, char**)’:
grader_Anna.cpp:53:13: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
   53 |   argv[2] = "/dev/null";
      |             ^~~~~~~~~~~
grader_Anna.cpp:80:18: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wformat=]
   80 |         printf("%d\n", u.size());
      |                 ~^     ~~~~~~~~
      |                  |           |
      |                  int         std::vector<int>::size_type {aka long unsigned int}
      |                 %ld
/usr/bin/ld: /tmp/ccP6Yu2j.o:(.bss+0x380): multiple definition of `rnd'; /tmp/cc6Gppli.o:(.bss+0x0): first defined here
collect2: error: ld returned 1 exit status