View Compilation Error

0_0_38503405_17534.cpp:1:8: error: 'N' was not declared in this scope
 int fa[N];
        ^
0_0_38503405_17534.cpp: In function 'void init(int)':
0_0_38503405_17534.cpp:3:22: error: 'fa' was not declared in this scope
  for(int i=0;i<n;i++)fa[i] = i;
                      ^
0_0_38503405_17534.cpp: In function 'int find(int)':
0_0_38503405_17534.cpp:6:10: error: 'fa' was not declared in this scope
  if(x != fa[x])fa[x] = find(fa[x]);
          ^
0_0_38503405_17534.cpp:7:9: error: 'fa' was not declared in this scope
  return fa[x];
         ^
0_0_38503405_17534.cpp: In function 'void un(int, int)':
0_0_38503405_17534.cpp:12:12: error: 'fa' was not declared in this scope
  if(x != y)fa[x] = y;
            ^