View Compilation Error

0_0_33777900_677.cpp:11:8: error: 'maxn' was not declared in this scope
 int fa[maxn];
        ^
0_0_33777900_677.cpp:13:9: error: 'maxn' was not declared in this scope
 bool is[maxn];
         ^
0_0_33777900_677.cpp: In function 'int find_fa(int)':
0_0_33777900_677.cpp:18:9: error: 'fa' was not declared in this scope
     if( fa[u]==u ) return u;
         ^
0_0_33777900_677.cpp:19:12: error: 'fa' was not declared in this scope
     return fa[u]=find_fa(fa[u]);
            ^
0_0_33777900_677.cpp: In function 'int main()':
0_0_33777900_677.cpp:58:13: error: 'fa' was not declared in this scope
             fa[i]=i;
             ^
0_0_33777900_677.cpp:62:16: error: 'is' was not declared in this scope
         memset(is,false,sizeof(is));
                ^
0_0_33777900_677.cpp:69:13: error: 'fa' was not declared in this scope
             fa[fv]=fu;
             ^