/in/foo.cc: In function 'int zhao(int, int)':
/in/foo.cc:45:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:13:7: warning: iteration 67 invokes undefined behavior [-Waggressive-loop-optimizations]
   q[i]=q[i-1]+q[i-2];
   ~~~~^~~~~~~~~~~~~~
/in/foo.cc:12:16: note: within this loop
  for (int i=3;i<=70;i++)
               ~^~~~