How to create a Vector of Vectors in C++

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How to create a Vector of Vectors in C++ ?

Answer

To create a vector of vectors in C++, you can use a vector of vectors of a specific type.

✐ Examples

1 Create Vector of Vectors

In this example,

We define a vector named vectorOfVectors with a specific data type.
Each inner vector is represented as a separate vector within the main vector.
Finally, we print the vector of vectors to standard output.

C++ Program

#include <iostream>
#include <vector>

int main() {
    std::vector<std::vector<int>> vectorOfVectors = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };

    for (const auto& innerVector : vectorOfVectors) {
        for (const auto& value : innerVector) {
            std::cout << value << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}

Output

1 2 3
4 5 6
7 8 9

Summary

In this tutorial, we learned How to create a Vector of Vectors in C++ language with well detailed examples.