View Compilation Error

0_0_20339725_11688.cpp: In function 'int find(int)':
0_0_20339725_11688.cpp:11:15: error: 'fa' was not declared in this scope
     return x==fa[x]?x:fa[x]=find_fa( fa[x] );
               ^
0_0_20339725_11688.cpp:11:44: error: 'find_fa' was not declared in this scope
     return x==fa[x]?x:fa[x]=find_fa( fa[x] );
                                            ^