View Compilation Error

0_0_33451683_32095.cpp: In function 'int find(int)':
0_0_33451683_32095.cpp:9:5: error: 'fa' was not declared in this scope
  if(fa[x]==x){
     ^
0_0_33451683_32095.cpp:12:2: error: 'fa' was not declared in this scope
  fa[x]=find(fa[x]);
  ^
0_0_33451683_32095.cpp: In function 'void co(int, int)':
0_0_33451683_32095.cpp:20:3: error: 'fa' was not declared in this scope
   fa[a]=b;
   ^
0_0_33451683_32095.cpp: In function 'int main()':
0_0_33451683_32095.cpp:31:4: error: 'fa' was not declared in this scope
    fa[i]=i;
    ^