initialize 3d vector c++

vector<vector<vector<double>>> f(3, vector<vector<double>>(4, vector<double>(5)));

vector<vector<vector<int>>> dp(n+1,vector<vector<int>>(n+1,vector<int>(n+1,-1)));

std::vector<type> name;

#include <bits/stdc++.h> 
#include <vector> 
using namespace std; 
  
int main() 
{ 
// This vector initializes with the values: 10, 20, and 30
  vector<int> vect{ 10, 20, 30 }; 

    return 0; 
} 

vector<vector<vector<double>>> f(3, vector<vector<double>>(4, vector<double>(5)));