/in/foo.cc: In function 'int Output(int)':
/in/foo.cc:7:13: warning: unused variable 'x' [-Wunused-variable]
    7 |         int x;
      |             ^
/in/foo.cc: In function 'int sum(int)':
/in/foo.cc:23:13: warning: unused variable 'a' [-Wunused-variable]
   23 |         int a[N];
      |             ^