View Compilation Error

0_0_13279267_17206.cpp: In function 'int find(int)':
0_0_13279267_17206.cpp:14:5: error: 'father' was not declared in this scope
  if(father[x]==-1) return x;
     ^
0_0_13279267_17206.cpp:15:10: error: 'father' was not declared in this scope
  return (father[x] = find(father[x]));
          ^