foo.cc: In function 'int main()':
foo.cc:13:14: error: 'malloc' was not declared in this scope
   13 |     int *a = malloc(1024 * 1024 * 10);
      |              ^~~~~~
foo.cc:3:1: note: 'malloc' is defined in header '<cstdlib>'; did you forget to '#include <cstdlib>'?
    2 | #include <unistd.h>
  +++ |+#include <cstdlib>
    3 | int main()

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