View Compilation Error

0_0_37793613_2727.cpp: In function 'void dfs(int, int)':
0_0_37793613_2727.cpp:34:5: error: 'dep_node' was not declared in this scope
     dep_node[dep[u]].pb(u);
     ^
0_0_37793613_2727.cpp: In function 'int main()':
0_0_37793613_2727.cpp:80:47: error: 'dep_node' was not declared in this scope
         for (int i = 1; i <= mx_dep + 1; i++) dep_node[i].clear();
                                               ^