/in/foo.cc: In function 'int MergeSubs(int*, int, int)':
/in/foo.cc:32:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc:29:4: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   b=b-1;
   ~^~~~