View Compilation Error

0_0_37621855_19836.cpp: In function 'bool cmp(P, P)':
0_0_37621855_19836.cpp:12:17: error: 'aa' was not declared in this scope
      return max(aa.a+bb.a-aa.b,aa.a)<max(aa.a+bb.a-bb.b,bb.a);
                 ^
0_0_37621855_19836.cpp:12:22: error: 'bb' was not declared in this scope
      return max(aa.a+bb.a-aa.b,aa.a)<max(aa.a+bb.a-bb.b,bb.a);
                      ^