Home Cryptocurency Exchangesstd::min_element in C++ – GeeksforGeeks
std::min_element in C++ – GeeksforGeeks

std::min_element in C++ – GeeksforGeeks

For calculating the smallest of all the elements in a given list, we have std::min, but what if we want to find the smallest not in the whole list, but in a sub-section of the list. To serve this purpose, we have std::min_element in C++.

std::min_element is defined inside the header file and it returns an iterator pointing to the element with the smallest value in the range [first, last).

Unlike std::min, which can be used in three ways, std::min_element can be used in two ways. The comparisons can be performed using either operator < (first version), or using a pre-defined function (second version). If more than one element satisfies the condition of being the smallest, the iterator returned points to the first of such elements.
The two versions are defined as given below:

  1. For comparing elements using “<":
    Syntax:

    template
    ForwardIterator min_element (ForwardIterator first, ForwardIterator last);

    first: Forward iterator pointing to the beginning of the range.
    last: Forward iterator pointing to the end of the range.

    Return Value: It return a pointer to the smallest
    element in the range, and in case if there are more than one such element,
    then it points to the first one.
    It points to the last in case the range is empty.

    #include

    #include

    using namespace std;

    int main()

    {

        int v[] = { 9, 4, 7, 2, 5, 10, 11, 12, 1, 3, 6 };

        int* i1;

        i1 = std::min_element(v + 2, v + 5);

        cout << *i1 << "n";

        return 0;

    }

    Output:

    2

  2. For comparison based on a pre-defined function:

    Syntax:

    template
    ForwardIterator min_element (ForwardIterator first, ForwardIterator last,
    Compare comp);
    Here, first and last are the same as previous case.
    comp: Binary function that accepts two elements
    in the range as arguments, and returns a value convertible to bool.
    The value returned indicates whether the element passed as first
    argument is considered less than the second.
    The function shall not modify any of its arguments.
    This can either be a function pointer or a function object.

    Return Value: It return a pointer to the smallest element
    in the range, and in case if there are more than one such element,
    then it points to the first one.
    It points to the last in case the range is empty.

    #include

    #include

    using namespace std;

    bool comp(int a, int b)

    {

        return (a < b);

    }

    int main()

    {

        int v[] = { 9, 4, 7, 2, 5, 10, 11, 12, 1, 3, 6 };

        int* i1;

        i1 = std::min_element(v + 2, v + 9, comp);

        cout << *i1 << "n";

        return 0;

    }

    Output:

    1

Related Articles:

This article is contributed by Mrigendra Singh. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

Source

Leave a Reply

Your email address will not be published. Required fields are marked *

Human Verification: In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.