/in/foo.cc: In function 'long long int Lucas(long long int, long long int)':
/in/foo.cc:25:8: warning: unused variable 'i' [-Wunused-variable]
 {  int i,j;  
        ^
/in/foo.cc:25:10: warning: unused variable 'j' [-Wunused-variable]
 {  int i,j;  
          ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:32:6: warning: unused variable 'i' [-Wunused-variable]
  int i,j,k,T;  
      ^
/in/foo.cc:32:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,T;  
        ^
/in/foo.cc:32:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,T;  
          ^