/in/foo.cc: In function 'int main()':
/in/foo.cc:57:14: warning: 'n2' is used uninitialized [-Wuninitialized]
   57 |         Input(a2, n2);
      |         ~~~~~^~~~~~~~
/in/foo.cc:53:17: note: 'n2' was declared here
   53 |         int n1, n2;
      |                 ^~