how to get part from the vector cpp

To get a part from a vector in C++, you can use the std::vector member function std::vector::subvector. Here's how you can do it:

First, include the <vector> header file at the beginning of your code to use the std::vector container:

cpp #include <vector>

Create a std::vector object and populate it with some values:

cpp std::vector<int> myVector = {1, 2, 3, 4, 5};

Use the std::vector::subvector member function to get the desired part of the vector. The subvector function takes two iterators as arguments, representing the range of elements you want to extract:

cpp std::vector<int> sub = std::vector<int>(myVector.begin() + startIndex, myVector.begin() + endIndex);

In the above code, startIndex is the index of the first element you want to include in the subvector, and endIndex is the index of the element that comes after the last element you want to include.

The resulting subvector will be stored in the sub variable, which you can then use as needed.

Here's a complete example that demonstrates getting a part from a vector:

#include <iostream>
#include <vector>

int main() {
    std::vector<int> myVector = {1, 2, 3, 4, 5};
    int startIndex = 1;
    int endIndex = 4;

    std::vector<int> sub = std::vector<int>(myVector.begin() + startIndex, myVector.begin() + endIndex);

    for (int element : sub) {
        std::cout << element << " ";
    }
    // Output: 2 3 4

    return 0;
}

In this example, the subvector extracted from myVector contains the elements at indices 1, 2, and 3, which are 2, 3, and 4 respectively. The code then prints these elements to the console.