View Compilation Error

0_0_33744065_25160.cpp:7:17: error: 'MAXN' was not declared in this scope
 vector<int>edge[MAXN];
                 ^
0_0_33744065_25160.cpp: In function 'void init()':
0_0_33744065_25160.cpp:16:3: error: 'edge' was not declared in this scope
   edge[i].clear();
   ^
0_0_33744065_25160.cpp: In function 'void tarjan(int)':
0_0_33744065_25160.cpp:24:14: error: 'edge' was not declared in this scope
  for(int v : edge[u]) {
              ^
0_0_33744065_25160.cpp: In function 'int main()':
0_0_33744065_25160.cpp:52:4: error: 'edge' was not declared in this scope
    edge[u].push_back(v);
    ^
0_0_33744065_25160.cpp:59:16: error: 'edge' was not declared in this scope
    for(int j : edge[i]) {
                ^