View Compilation Error

0_0_36052497_32663.cpp:13:8: error: 'maxn' was not declared in this scope
 int fa[maxn];
        ^
0_0_36052497_32663.cpp: In function 'int find(int)':
0_0_36052497_32663.cpp:41:9: error: 'fa' was not declared in this scope
     if (fa[x] == x) return x;
         ^
0_0_36052497_32663.cpp: In function 'void connect(int, int, int)':
0_0_36052497_32663.cpp:50:9: error: 'fa' was not declared in this scope
         fa[nx] = ny;
         ^
0_0_36052497_32663.cpp: In function 'void rollback()':
0_0_36052497_32663.cpp:59:33: error: 'fa' was not declared in this scope
     for (int i = 1; i <= n; i++)fa[i] = i;
                                 ^