Merging two 2D vectors is a common task in many programming applications. In this blog post, we will explore different techniques to merge two 2D vectors efficiently.

1. Creating a New Vector One simple approach is to create a new vector and iterate over both vectors, appending the elements to the new vector. Here is an example in Python:

vector1 = [[1, 2], [3, 4], [5, 6]]
vector2 = [[7, 8], [9, 10], [11, 12]]

merged_vector = vector1 + vector2

print(merged_vector)

Output:

[[1, 2], [3, 4], [5, 6], [7, 8], [9, 10], [11, 12]]

In this approach, we simply concatenate the two vectors using the “+” operator. This creates a new vector with elements from both input vectors.

1. In-place Merging If we don’t want to create a new vector, we can merge the vectors in-place. This approach is useful when memory is a concern. Here is an example in C++:

#include <iostream>
#include <vector>

void mergeVectors(std::vector<std::vector<int>>& vector1, const std::vector<std::vector<int>>& vector2) {
    vector1.insert(vector1.end(), vector2.begin(), vector2.end());
}

int main() {
    std::vector<std::vector<int>> vector1 { {1, 2}, {3, 4}, {5, 6} };
    std::vector<std::vector<int>> vector2 { {7, 8}, {9, 10}, {11, 12} };

    mergeVectors(vector1, vector2);

    for (const auto& vector : vector1) {
        for (const auto& element : vector) {
            std::cout << element << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}

Output:

1 2
3 4
5 6
7 8
9 10
11 12

The mergeVectors function takes the first vector as a reference and appends the elements from the second vector using the insert function.

By using these techniques, you can efficiently merge two 2D vectors in your programming applications.