View Compilation Error

0_0_39312001_21687.cpp:8:1: error: 'vector' does not name a type
    8 | vector<int> E[N];
      | ^~~~~~
0_0_39312001_21687.cpp: In function 'void dfs(int, int)':
0_0_39312001_21687.cpp:13:19: error: 'E' was not declared in this scope
   13 |     for(int i=0;i<E[u].size();i++){
      |                   ^
0_0_39312001_21687.cpp: In function 'int dfs1(int, int)':
0_0_39312001_21687.cpp:27:20: error: 'E' was not declared in this scope
   27 |     for(int  i=0;i<E[u].size();i++){
      |                    ^
0_0_39312001_21687.cpp: In function 'int main()':
0_0_39312001_21687.cpp:42:13: error: 'E' was not declared in this scope
   42 |             E[i].clear();
      |             ^
0_0_39312001_21687.cpp:50:13: error: 'E' was not declared in this scope
   50 |             E[u].push_back(i);
      |             ^