View Compilation Error

0_0_39491979_18643.cpp:23:28: error: 'vector' does not name a type
   23 |         int T,n,f[1000005];vector<int>v[1000005];
      |                            ^~~~~~
0_0_39491979_18643.cpp: In function 'int my_namespace::main()':
0_0_39491979_18643.cpp:27:47: error: 'v' was not declared in this scope
   27 |                         for(int j=i;j<=n;j+=i)v[j+1].push_back(i);
      |                                               ^
0_0_39491979_18643.cpp:30:35: error: 'v' was not declared in this scope
   30 |                         for(int j:v[i]){
      |                                   ^