c++ initialize vector of vector with size
vector<vector<int>> v(10, vector<int>(10));
c++ initialize size of 3d vector
vector<vector<vector<double>>> f(3, vector<vector<double>>(4, vector<double>(5)));
Source: stackoverflow.com
c++ create vector of size
// create a vector with 20 integer elements std::vector<int> arr(20); for(int x = 0; x < 20; ++x) arr[x] = x;
Source: stackoverflow.com
declare vector of size n in c++
#include <vector> auto n = 20 // create a vector with n=20 integer elements std::vector<int> arr(n);