View Compilation Error

0_0_36046585_11698.cpp: In function 'void init()':
0_0_36046585_11698.cpp:10:23: error: 'haed' was not declared in this scope
  memset(head,0,sizeof(haed));
                       ^
0_0_36046585_11698.cpp: In function 'bool SAT2(int)':
0_0_36046585_11698.cpp:35:28: error: 'S' was not declared in this scope
             while(top) vis[S[--top]]=false;
                            ^