View Compilation Error

0_0_37811377_18098.cpp: In function 'int get(int)':
0_0_37811377_18098.cpp:9:5: error: 'fa' was not declared in this scope
  if(fa[x] == x) return x;
     ^
0_0_37811377_18098.cpp:10:9: error: 'fa' was not declared in this scope
  return fa[x] = get(fa[x]);
         ^