/in/foo.cc: In function 'int move(int, int, int, int)':
/in/foo.cc:33:9: warning: unused variable 'res' [-Wunused-variable]
     int res = f[n-1] + 1 + move(n-1,temp,to,from);
         ^~~
/in/foo.cc:34:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^