View Compilation Error

0_0_36318502_14932.cpp: In function 'int main()':
0_0_36318502_14932.cpp:134:12: error: 'rd' was not declared in this scope
       l=rd();r=rd();
            ^
0_0_36318502_14932.cpp:139:12: error: 'rd' was not declared in this scope
       l=rd();r=rd();
            ^
0_0_36318502_14932.cpp:143:12: error: 'rd' was not declared in this scope
       l=rd();r=rd();
            ^