View Compilation Error

0_0_18286056_7572.cpp: In function 'int main()':
0_0_18286056_7572.cpp:13:6: error: 'r' was not declared in this scope
   if(r <= 1)
      ^
0_0_18286056_7572.cpp:17:17: error: 'l' was not declared in this scope
   else if (r == l)
                 ^