/in/foo.cc: In function 'int main()':
/in/foo.cc:268:29: warning: 'sp' may be used uninitialized [-Wmaybe-uninitialized]
  268 |                     if (sp[n] != 0) continue;
      |                         ~~~~^
/in/foo.cc:266:25: note: 'sp' declared here
  266 |                     int sp[10], si[10], comp;
      |                         ^~