View Compilation Error

0_0_39332097_6822.cpp: In function 'int main()':
0_0_39332097_6822.cpp:33:15: error: 'rd' was not declared in this scope
   33 |             k=rd();
      |               ^~
0_0_39332097_6822.cpp:37:15: error: 'rd' was not declared in this scope
   37 |             k=rd();
      |               ^~