#include <iostream>
#include <vector>
int main() {
// Step 1: Specify the number of rows and columns
int rows = 3;
int columns = 4;
// Step 2: Initialize a 2D vector with the specified size
std::vector<std::vector<int>> myVector(rows, std::vector<int>(columns));
// Step 3: Access and modify elements in the 2D vector
myVector[1][2] = 42;
// Step 4: Display the elements of the 2D vector
for (int i = 0; i < rows; ++i) {
for (int j = 0; j < columns; ++j) {
std::cout << myVector[i][j] << " ";
}
std::cout << std::endl;
}
return 0;
}