View Compilation Error

0_0_14195929_4592.cpp:25:8: error: 'maxna' was not declared in this scope
 int fa[maxna];
        ^
0_0_14195929_4592.cpp: In function 'int Find(int)':
0_0_14195929_4592.cpp:55:5: error: 'fa' was not declared in this scope
  if(fa[n]==n)
     ^
0_0_14195929_4592.cpp:57:14: error: 'fa' was not declared in this scope
  return Find(fa[n]);
              ^
0_0_14195929_4592.cpp: In function 'int Union(int, int)':
0_0_14195929_4592.cpp:65:3: error: 'fa' was not declared in this scope
   fa[fv]=fu;
   ^
0_0_14195929_4592.cpp: In function 'void Init(int)':
0_0_14195929_4592.cpp:74:12: error: 'fa' was not declared in this scope
   cnt[i]=1,fa[i]=i;
            ^