View Compilation Error

0_0_30391782_8878.cpp: In function 'int main()':
0_0_30391782_8878.cpp:51:20: error: 'fen' was not declared in this scope
   scanf("%d%d",&n,&fen);
                    ^
0_0_30391782_8878.cpp:56:3: error: 'liang' was not declared in this scope
   liang=num/fen;
   ^
0_0_30391782_8878.cpp:57:10: error: 'vis' was not declared in this scope
   memset(vis,0,sizeof(vis));
          ^
0_0_30391782_8878.cpp:59:4: error: 'myset' was not declared in this scope
    myset[i].clear();
    ^
0_0_30391782_8878.cpp:65:17: error: 'myset' was not declared in this scope
     printf("%d",myset[i].size());
                 ^