/in/foo.cc: In function 'long long int cal(long long int)':
/in/foo.cc:37:14: warning: unused variable 'j' [-Wunused-variable]
  long long i,j,k,l;
              ^
/in/foo.cc:37:16: warning: unused variable 'k' [-Wunused-variable]
  long long i,j,k,l;
                ^
/in/foo.cc:37:18: warning: unused variable 'l' [-Wunused-variable]
  long long i,j,k,l;
                  ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:70:14: warning: unused variable 'j' [-Wunused-variable]
  long long i,j,k,l;
              ^
/in/foo.cc:70:16: warning: unused variable 'k' [-Wunused-variable]
  long long i,j,k,l;
                ^
/in/foo.cc:70:18: warning: unused variable 'l' [-Wunused-variable]
  long long i,j,k,l;
                  ^
/in/foo.cc: In function 'long long int search(long long int, long long int)':
/in/foo.cc:67:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^