/in/foo.cc:4:7: error: 'maxn' was not declared in this scope
 int a[maxn];
       ^~~~
/in/foo.cc:5:1: error: 'll' does not name a type
 ll fib[maxn];
 ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:8:2: error: 'fib' was not declared in this scope
  fib[1] = 1;
  ^~~
/in/foo.cc:12:6: error: 'read' was not declared in this scope
  n = read;
      ^~~~
/in/foo.cc:13:2: error: 'll' was not declared in this scope
  ll x,y;
  ^~
/in/foo.cc:15:3: error: 'x' was not declared in this scope
   x = read,y = read;
   ^
/in/foo.cc:15:12: error: 'y' was not declared in this scope
   x = read,y = read;
            ^