View Compilation Error

0_0_25721576_31314.cpp:42:8: error: 'pii' does not name a type
 inline pii merge(const cir &A,const cir &B) {
        ^
0_0_25721576_31314.cpp: In function 'double chgdis(const cir&, const cir&)':
0_0_25721576_31314.cpp:55:2: error: 'pii' was not declared in this scope
  pii the = merge(A,B);
  ^
0_0_25721576_31314.cpp:56:22: error: 'the' was not declared in this scope
  double detdis = B.r*the.second-A.r*the.first;
                      ^