CPP

vectors c++

#include <iostream>
#include <vector>
 
using namespace std;

int main()
{
    // Create a vector containing integers
   vector<int> v = { 7, 5, 16, 8 };
 
    v.push_back(25); // Adds 25 to the contents of the vector 
    v.push_back(13); // Adds 13 to the contents of the vector
 
    // Print out the contents of the vector
    cout << "v = { ";
    for (int n : v) {
        std::cout << n << ", ";
    }
    cout << "}; 
";
}

vector of vectors c++

vector<vector<int>> matrix(x, vector<int>(y));

This creates x vectors of size y, filled with 0's.