create a 2d vector in c++

To create a 2D vector in C++, follow these steps:

1. Include the necessary header file:

#include <vector>

1. Declare the 2D vector variable:

std::vector<std::vector<int>> myVector;

1. Initialize the size of the vector:

int rows = 3;
int columns = 4;
myVector.resize(rows, std::vector<int>(columns));

1. Access and modify the elements of the vector:

myVector[0][0] = 1;  // Assign a value to the element at row 0, column 0
int value = myVector[1][2];  // Retrieve the value of the element at row 1, column 2

1. Iterate over the vector:

for (int i = 0; i < myVector.size(); i++) {
    for (int j = 0; j < myVector[i].size(); j++) {
        // Access and process each element of the vector
        int element = myVector[i][j];
        // ...
    }
}

That's it! You now have a 2D vector in C++. Feel free to modify and use it as needed.