foo.cc:1:30: error: too many decimal points in number
 var pre,res,vis,ok,len:Array[0..101]of longint;
                              ^~~~~~
foo.cc:2:15: error: too many decimal points in number
 lin,ans:Array[0..101]of longint;
               ^~~~~~
foo.cc:18:7: warning: multi-character character constant [-Wmultichar]
 write('FD ');
       ^~~~~
foo.cc:20:7: warning: character constant too long for its type
 write(' is redundant using FDs:');
       ^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:90:14: warning: character constant too long for its type
 else writeln('No redundant FDs.');
              ^~~~~~~~~~~~~~~~~~~
foo.cc:1:1: error: 'var' does not name a type; did you mean 'char'?
 var pre,res,vis,ok,len:Array[0..101]of longint;
 ^~~
 char
foo.cc:2:1: error: 'lin' does not name a type
 lin,ans:Array[0..101]of longint;
 ^~~
foo.cc:3:1: error: 'i' does not name a type
 i,j,k,m,n,t,l,r,best:longint;
 ^
foo.cc:4:5: error: found ':' in nested-name-specifier, expected '::'
 flag:Boolean;
     ^
foo.cc:4:1: error: 'flag' does not name a type; did you mean 'float'?
 flag:Boolean;
 ^~~~
 float
foo.cc:5:1: error: 's' does not name a type
 s,st:String;
 ^
foo.cc:7:1: error: 'function' does not name a type; did you mean 'union'?
 function bush(s:String):longint;
 ^~~~~~~~
 union
foo.cc:8:1: error: 'var' does not name a type; did you mean 'char'?
 var i,j:longint;
 ^~~
 char
foo.cc:9:1: error: 'begin' does not name a type
 begin
 ^~~~~
foo.cc:11:1: error: expected unqualified-id before 'for'
 for i:=1 to length(s) do
 ^~~
foo.cc:13:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:15:1: error: 'procedure' does not name a type
 procedure print(x,y:longint);
 ^~~~~~~~~
foo.cc:16:1: error: 'var' does not name a type; did you mean 'char'?
 var i,j:longint;
 ^~~
 char
foo.cc:17:1: error: 'begin' does not name a type
 begin
 ^~~~~
foo.cc:19:6: error: expected constructor, destructor, or type conversion before '(' token
 write(x);
      ^
foo.cc:20:6: error: expected constructor, destructor, or type conversion before '(' token
 write(' is redundant using FDs:');
      ^
foo.cc:21:1: error: expected unqualified-id before 'for'
 for i:=1 to y do write(' ',ans[i]);
 ^~~
foo.cc:22:1: error: 'writeln' does not name a type
 writeln;
 ^~~~~~~
foo.cc:23:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:25:1: error: 'function' does not name a type; did you mean 'union'?
 function dfs(dep,now,goa:longint):Boolean;
 ^~~~~~~~
 union
foo.cc:26:1: error: 'var' does not name a type; did you mean 'char'?
 var i,j,k:longint;
 ^~~
 char
foo.cc:27:1: error: 'begin' does not name a type
 begin
 ^~~~~
foo.cc:30:1: error: 'ans' does not name a type
 ans:=lin;
 ^~~
foo.cc:31:1: error: 'exit' does not name a type
 exit;
 ^~~~
foo.cc:32:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:33:1: error: expected unqualified-id before 'if'
 if dep >= best then exit;
 ^~
foo.cc:34:1: error: expected unqualified-id before 'for'
 for i:=1 to n do
 ^~~
foo.cc:37:1: error: 'vis' does not name a type; did you mean 'void'?
 vis[i]:=1;
 ^~~
 void
foo.cc:38:4: error: expected constructor, destructor, or type conversion before '(' token
 dfs(dep+1,now or res[i],goa);
    ^
foo.cc:39:1: error: 'vis' does not name a type; did you mean 'void'?
 vis[i]:=0;
 ^~~
 void
foo.cc:40:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:41:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:43:1: error: 'begin' does not name a type
 begin
 ^~~~~
foo.cc:46:1: error: expected unqualified-id before 'for'
 for i:=1 to n do begin
 ^~~
foo.cc:48:1: error: 'st' does not name a type
 st:=copy(s,1,pos('-',s)-1);
 ^~
foo.cc:49:1: error: expected unqualified-id before 'delete'
 delete(s,1,pos('>',s));
 ^~~~~~
foo.cc:50:1: error: 'pre' does not name a type
 pre[i]:=bush(st);
 ^~~
foo.cc:51:1: error: 'res' does not name a type
 res[i]:=bush(s);
 ^~~
foo.cc:52:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:54:1: error: expected unqualified-id before 'for'
 for i:=1 to n do begin
 ^~~
foo.cc:56:1: error: 'vis' does not name a type; did you mean 'void'?
 vis[i]:=1;
 ^~~
 void
foo.cc:57:1: error: 'flag' does not name a type; did you mean 'float'?
 flag:=true;
 ^~~~
 float
foo.cc:58:1: error: 't' does not name a type
 t:=pre[i]; r:=res[i];
 ^
foo.cc:58:12: error: 'r' does not name a type
 t:=pre[i]; r:=res[i];
            ^
foo.cc:59:1: error: expected unqualified-id before 'while'
 while flag do begin
 ^~~~~
foo.cc:61:1: error: 'flag' does not name a type; did you mean 'float'?
 flag:=false;
 ^~~~
 float
foo.cc:62:1: error: 'j' does not name a type
 j:=1;
 ^
foo.cc:63:1: error: expected unqualified-id before 'while'
 while j<=n do begin
 ^~~~~
foo.cc:66:1: error: 'vis' does not name a type; did you mean 'void'?
 vis[j]:=1;
 ^~~
 void
foo.cc:67:4: error: expected constructor, destructor, or type conversion before '(' token
 inc(len[i]);
    ^
foo.cc:68:1: error: 'flag' does not name a type; did you mean 'float'?
 flag:=true;
 ^~~~
 float
foo.cc:69:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:70:4: error: expected constructor, destructor, or type conversion before '(' token
 inc(j);
    ^
foo.cc:71:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:72:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:73:1: error: expected unqualified-id before 'if'
 if flag then begin
 ^~
foo.cc:75:4: error: expected constructor, destructor, or type conversion before '(' token
 inc(m);
    ^
foo.cc:76:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:77:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:79:9: error: expected constructor, destructor, or type conversion before '(' token
 fillchar(vis,sizeof(vis),0);
         ^
foo.cc:80:1: error: expected unqualified-id before 'if'
 if m<>0 then begin
 ^~
foo.cc:84:1: error: 'vis' does not name a type; did you mean 'void'?
 vis[i]:=1;
 ^~~
 void
foo.cc:85:4: error: expected constructor, destructor, or type conversion before '(' token
 dfs(0,pre[i],res[i]);
    ^
foo.cc:86:6: error: expected constructor, destructor, or type conversion before '(' token
 print(i,best);
      ^
foo.cc:87:1: error: 'vis' does not name a type; did you mean 'void'?
 vis[i]:=0;
 ^~~
 void
foo.cc:88:1: error: 'end' does not name a type; did you mean 'enum'?
 end;
 ^~~
 enum
foo.cc:89:1: error: 'end' does not name a type; did you mean 'enum'?
 end
 ^~~
 enum
foo.cc:91:1: error: 'end' does not name a type; did you mean 'enum'?
 end
 ^~~
 enum

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。