/in/foo.cc: In function 'int main()':
/in/foo.cc:31:14: warning: iteration 26 invokes undefined behavior [-Waggressive-loop-optimizations]
   if(minn>a[i] and a[i]!=0)minn=a[i];
           ~~~^
/in/foo.cc:29:15: note: within this loop
  for(int i=1;i<=27;i++)
              ~^~~~