View Compilation Error

0_0_39514363_13865.cpp:8:1: error: 'vector' does not name a type
    8 | vector<int> t[20010];
      | ^~~~~~
0_0_39514363_13865.cpp: In function 'void dfs(int, int)':
0_0_39514363_13865.cpp:16:19: error: 't' was not declared in this scope
   16 |     for(int i=0;i<t[u].size();i++)
      |                   ^
0_0_39514363_13865.cpp: In function 'void dfs2(int, int)':
0_0_39514363_13865.cpp:37:19: error: 't' was not declared in this scope
   37 |     for(int i=0;i<t[u].size();i++)
      |                   ^
0_0_39514363_13865.cpp: In function 'int main()':
0_0_39514363_13865.cpp:60:13: error: 't' was not declared in this scope
   60 |             t[i].clear();
      |             ^
0_0_39514363_13865.cpp:65:13: error: 't' was not declared in this scope
   65 |             t[u].push_back(v);
      |             ^