View Compilation Error

0_0_26147217_21695.cpp: In function 'bool cmp(const cor&, const cor&)':
0_0_26147217_21695.cpp:14:9: error: 'y' was not declared in this scope
  return y < that.y ? 1 : (y == that.y ? x < that.x : 0);
         ^
0_0_26147217_21695.cpp:14:13: error: 'that' was not declared in this scope
  return y < that.y ? 1 : (y == that.y ? x < that.x : 0);
             ^
0_0_26147217_21695.cpp:14:41: error: 'x' was not declared in this scope
  return y < that.y ? 1 : (y == that.y ? x < that.x : 0);
                                         ^