/in/foo.cc: In function 'int main()':
/in/foo.cc:21:11: warning: iteration 1 invokes undefined behavior [-Waggressive-loop-optimizations]
  cout<<c[i]<<" ";
           ^
/in/foo.cc:20:15: note: within this loop
  for(int i=1;i<=2;i++)
              ~^~~
/in/foo.cc:13:9: warning: array subscript is above array bounds [-Warray-bounds]
  s1=(a[2]-b[2])*(a[2]-b[2]);
      ~~~^
/in/foo.cc:13:14: warning: array subscript is above array bounds [-Warray-bounds]
  s1=(a[2]-b[2])*(a[2]-b[2]);
           ~~~^