View Compilation Error

0_0_35216706_31880.cpp:15:9: error: 'MAXN' was not declared in this scope
 int vis[MAXN];
         ^
0_0_35216706_31880.cpp: In function 'int main()':
0_0_35216706_31880.cpp:33:10: error: 'vis' was not declared in this scope
          vis[i] = 1;
          ^
0_0_35216706_31880.cpp:42:21: error: 'vis' was not declared in this scope
                 if (vis[j]) 
                     ^