View Compilation Error

0_0_39130004_32757.cpp:15:1: error: 'vector' does not name a type
   15 | vector<int>v[N];
      | ^~~~~~
0_0_39130004_32757.cpp: In function 'void dfs(long long int, long long int)':
0_0_39130004_32757.cpp:20:21: error: 'v' was not declared in this scope; did you mean 'vv'?
   20 |         for(auto vv:v[u])
      |                     ^
      |                     vv
0_0_39130004_32757.cpp: In function 'int main()':
0_0_39130004_32757.cpp:43:25: error: 'v' was not declared in this scope
   43 |                         v[at].push_back(bt),v[bt].push_back(at);
      |                         ^