answer.code: In function ‘int guess_palindromicity(int)’:
answer.code:38:15: error: ‘find_character’ was not declared in this scope
   38 |         int c=find_character(n-1,v);
      |               ^~~~~~~~~~~~~~
answer.code:42:23: error: ‘count_pair’ was not declared in this scope
   42 |                 int k=count_pair(l,r,n-1);
      |                       ^~~~~~~~~~
answer.code:50:20: error: ‘count_pair’ was not declared in this scope
   50 |                 if(count_pair(1,n-2,0)==3) return 1;
      |                    ^~~~~~~~~~
answer.code:54:20: error: ‘count_pair’ was not declared in this scope
   54 |                 if(count_pair(1,n-2,0)==3) return 0;
      |                    ^~~~~~~~~~
answer.code:55:20: error: ‘count_pair’ was not declared in this scope
   55 |                 if(count_pair(0,n-1,1)==1) return 1;
      |                    ^~~~~~~~~~
answer.code: In function ‘void fopn(std::string)’:
answer.code:11:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   11 |         freopen((name+".in").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
answer.code:12:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   12 |         freopen((name+".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
answer.code: In function ‘int guess_palindromicity(int)’:
answer.code:58:1: warning: control reaches end of non-void function [-Wreturn-type]
   58 | }
      | ^