View Compilation Error

0_0_32443661_10000.cpp: In function 'void solve()':
0_0_32443661_10000.cpp:26:27: error: 'cas' was not declared in this scope
  printf("Case %d: %d\n",++cas,work(r)-work(l-1));
                           ^
0_0_32443661_10000.cpp: In function 'int main()':
0_0_32443661_10000.cpp:30:13: error: 'rd' was not declared in this scope
  dep(_,1,rd())  solve();
             ^
0_0_32443661_10000.cpp:3:30: note: in definition of macro 'dep'
 #define dep(i,a,b) for(int i=b;i>=a;i--)
                              ^