View Compilation Error

0_0_39183051_6603.cpp:8:1: error: 'vector' does not name a type
    8 | vector<int> g[N];
      | ^~~~~~
0_0_39183051_6603.cpp: In function 'int dfs(int, int)':
0_0_39183051_6603.cpp:11:20: error: 'g' was not declared in this scope
   11 |         for(auto v:g[u]){
      |                    ^
0_0_39183051_6603.cpp: In function 'int main()':
0_0_39183051_6603.cpp:25:25: error: 'g' was not declared in this scope
   25 |                         g[u].push_back(v);
      |                         ^