View Compilation Error

0_0_33763590_6074.cpp: In function 'bool check(node, node, node, node)':
0_0_33763590_6074.cpp:31:32: error: expected ')' before ';' token
  ag += acos(dot(pa, pb)/(la*lb);
                                ^
0_0_33763590_6074.cpp:32:32: error: expected ')' before ';' token
  ag += acos(dot(pa, pc)/(la*lc);
                                ^
0_0_33763590_6074.cpp:33:32: error: expected ')' before ';' token
  ag += acos(dot(pc, pb)/(lb*lc);
                                ^
0_0_33763590_6074.cpp: In function 'void solve()':
0_0_33763590_6074.cpp:58:35: error: invalid initialization of non-const reference of type 'node&' from an rvalue of type 'node'
      ans = min(ans, abs(cross(p[k]-p[i], p[j]-p[i]))/(2.0*l));
                                   ^
0_0_33763590_6074.cpp:22:15: note: in passing argument 1 of 'double cross(node&, node&)'
 inline double cross(node &a, node &b)
               ^