View Compilation Error

0_0_36759821_30520.cpp: In member function 'int Dancing_Links_X::leave()':
0_0_36759821_30520.cpp:71:18: error: 'MAXSIZE' was not declared in this scope
         bool vis[MAXSIZE]; memset(vis, false, sizeof vis);
                  ^
0_0_36759821_30520.cpp:71:35: error: 'vis' was not declared in this scope
         bool vis[MAXSIZE]; memset(vis, false, sizeof vis);
                                   ^