/in/foo.cc: In function 'int find(int)':
/in/foo.cc:28:8: error: 'bo' was not declared in this scope
     if(bo[x]==0 || x==0) return x;
        ^~
/in/foo.cc:29:5: error: 'f' was not declared in this scope
     f[x]=find(f[x]);
     ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:47:6: error: expected primary-expression before ')' token
   if()
      ^
/in/foo.cc:48:2: error: expected primary-expression before '}' token
  }
  ^