/in/foo.cc: In function 'int main()':
/in/foo.cc:28:14: warning: unused variable 'd1' [-Wunused-variable]
  int x,y,a,b,d1,d2,t;
              ^~
/in/foo.cc:28:17: warning: unused variable 'd2' [-Wunused-variable]
  int x,y,a,b,d1,d2,t;
                 ^~
/in/foo.cc:28:20: warning: unused variable 't' [-Wunused-variable]
  int x,y,a,b,d1,d2,t;
                    ^
/in/foo.cc:43:22: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
     Ans=min(Ans,solve(x,y,0,a,b,0));
                 ~~~~~^~~~~~~~~~~~~
/in/foo.cc:43:22: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:43:22: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:43:22: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]