std::ranges::lexicographical_compare

Example

main: () = {
    v1: std::vector<char> = ('a', 'b', 'c', 'd');
    v2: std::vector<char> = ('a', 'b', 'c', 'd');

    ranges: namespace == std::ranges;
    os:= std::ostream_iterator<char>(std::cout, " ");

    dev: std::random_device = ();
    gen: std::mt19937 = (dev());
    while !ranges::lexicographical_compare(v1, v2) {
        ranges::copy(v1, os);
        std::cout << ">= ";
        ranges::copy(v2, os);
        std::cout << '\n';

        ranges::shuffle(v1, gen);
        ranges::shuffle(v2, gen);
    }

    ranges::copy(v1, os);
    std::cout << "<  ";
    ranges::copy(v2, os);
    std::cout << '\n';
}

Possible output

a b c d >= a b c d
d a b c >= c b d a
b d a c >= a d c b
a c d b <  c d a b