answer.code:50:23: error: ‘int y0 [200050]’ redeclared as different kind of entity
   50 | int n,x0[maxn],y0[maxn],x[maxn],y[maxn],p[maxn];
      |                       ^
In file included from /usr/include/features.h:461,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/c++config.h:679,
                 from /usr/include/c++/13/bits/requires_hosted.h:31,
                 from /usr/include/c++/13/iostream:38,
                 from answer.code:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:220:1: note: previous declaration ‘double y0(double)’
  220 | __MATHCALL (y0,, (_Mdouble_));
      | ^~~~~~~~~~
answer.code: In function ‘int main()’:
answer.code:62:57: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   62 |         for(int i = 1; i <= n; i ++) x0[i] = read(),y0[i] = read();
      |                                                         ^
answer.code:62:59: error: assignment of read-only location ‘*(y0 + ((sizetype)i))’
   62 |         for(int i = 1; i <= n; i ++) x0[i] = read(),y0[i] = read();
      |                                                     ~~~~~~^~~~~~~~
answer.code:63:27: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   63 |         x0[0] = x0[n],y0[0] = y0[n];
      |                           ^
answer.code:63:35: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   63 |         x0[0] = x0[n],y0[0] = y0[n];
      |                                   ^
answer.code:63:29: error: assignment of read-only location ‘* y0’
   63 |         x0[0] = x0[n],y0[0] = y0[n];
      |                       ~~~~~~^~~~~~~
answer.code:64:63: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   64 |         for(int i = 1; i <= n; i ++) d[i] = atan2l(y[i] = y0[i] - y0[i - 1],x[i] = x0[i] - x0[i - 1]);
      |                                                               ^
answer.code:64:75: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   64 |         for(int i = 1; i <= n; i ++) d[i] = atan2l(y[i] = y0[i] - y0[i - 1],x[i] = x0[i] - x0[i - 1]);
      |                                                                           ^
cc1plus: warning: pointer to a function used in arithmetic [-Wpointer-arith]
answer.code:64:65: error: ISO C++ forbids using pointer to a function in subtraction [-fpermissive]
   64 |         for(int i = 1; i <= n; i ++) d[i] = atan2l(y[i] = y0[i] - y0[i - 1],x[i] = x0[i] - x0[i - 1]);
      |                                                           ~~~~~~^~~~~~~~~~~