Arrays of Vectors in C++ STL

The C++ can create an array of vectors by using a vector to store vectors as its elements. This can be useful when you need a dynamic number of vectors, and each vector can have a different size. Here’s how you can create and use an array of vectors in C++ using the Standard Template Library (STL):

#include <iostream>
#include <vector>

int main() {
    const int arraySize = 3; // Size of the array of vectors

    // Create an array of vectors
    std::vector<int> arrayOfVectors[arraySize];

    // Populate the vectors in the array
    for (int i = 0; i < arraySize; ++i) {
        for (int j = 0; j < i + 1; ++j) {
            arrayOfVectors[i].push_back(i * 10 + j);
        }
    }

    // Access and print elements from each vector
    for (int i = 0; i < arraySize; ++i) {
        std::cout << "Vector " << i << ": ";
        for (int j = 0; j < arrayOfVectors[i].size(); ++j) {
            std::cout << arrayOfVectors[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}

In this example:

1. We define arraySize to determine the number of vectors in the array.
2. We create an array arrayOfVectors of vectors. Each element of arrayOfVectors is a vector that can store integers.
3. We populate each vector in the array with some sample values using a nested loop.
4. We access and print the elements from each vector in the array.

This demonstrates how you can create and work with an array of vectors in C++. Each vector in the array can have a different size, making it a flexible data structure for various applications.