c++ reverse part of vector

Reversing Part of a Vector in C++

To reverse part of a vector in C++, you can use the std::reverse function from the <algorithm> header. Here are the steps to achieve this:

1. Include the Necessary Header Files:

2. Include the <vector> and <algorithm> header files in your C++ program.

3. Create a Vector:

4. Create a vector and populate it with elements.

5. Use the std::reverse Function:

6. Use the std::reverse function to reverse the elements within a specified range of the vector.

Here's an example of how you can achieve this:

#include <iostream>
#include <vector>
#include <algorithm>

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

    // Reversing part of the vector from index 2 to index 5
    std::reverse(vec.begin() + 2, vec.begin() + 6);

    // Output the modified vector
    for (int num : vec) {
        std::cout << num << " ";
    }

    return 0;
}

This code snippet reverses the elements in the vector from index 2 to index 5. After running this code, the output will be: 1 2 6 5 4 3 7 8 9.