View Compilation Error

0_0_33214719_15724.cpp: In function 'bool check(int, int)':
0_0_33214719_15724.cpp:19:26: error: 'n' was not declared in this scope
 {   return Angle(p[b])+b>n?2*PI-Angle(p[a])<PI; }
                          ^
0_0_33214719_15724.cpp:19:47: error: expected ':' before ';' token
 {   return Angle(p[b])+b>n?2*PI-Angle(p[a])<PI; }
                                               ^
0_0_33214719_15724.cpp:19:47: error: expected primary-expression before ';' token