/in/foo.cc: In function 'int main()':
/in/foo.cc:22:28: warning: 'pair[1]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<pair[0]<<' '<<pair[1]<<endl;
                            ^
/in/foo.cc:22:17: warning: 'pair[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<pair[0]<<' '<<pair[1]<<endl;
                 ^~~