View Compilation Error

0_0_37880692_31269.cpp: In function 'int main()':
0_0_37880692_31269.cpp:12:6: error: 'l' was not declared in this scope
   if(l==0&&r==0&&B) ans1++;
      ^
0_0_37880692_31269.cpp:12:12: error: 'r' was not declared in this scope
   if(l==0&&r==0&&B) ans1++;
            ^