foo.cc: In function ‘int main()’:
foo.cc:25:11: warning: ‘b’ may be used uninitialized [-Wmaybe-uninitialized]
   25 |         m = b[0];
      |         ~~^~~~~~
foo.cc:6:26: note: ‘b’ declared here
    6 |         int n, a[100000],b[100000],m;
      |                          ^
foo.cc:25:11: warning: ‘b’ may be used uninitialized [-Wmaybe-uninitialized]
   25 |         m = b[0];
      |         ~~^~~~~~
foo.cc:6:26: note: ‘b’ declared here
    6 |         int n, a[100000],b[100000],m;
      |                          ^