Style first 3 posts differently with a container, then the rest of the posts [closed]

Question

As Milo noted, the final result might look something like the following

if ($wp_query->have_posts()) {
    while ($wp_query->have_posts()) {
        $wp_query->the_post();
        $post_title = get_the_title();

        # On the first pass, write the start of your single container
        if ( 0 == $wp_query->current_post ) {
            echo '<div class="container">';
        }
        echo <<<HTML
<div class="different-post-style">
    {$the_title}
</div>
HTML;

        # On the 3rd pass, close your single container
        if ( 2 == $wp_query->current_post ) {
            echo "\r\n</div>";
        }

    }
    # Close the div if there were 2 or fewer posts
    if ( $wp_query->current_post < 2 ) {
        echo "\r\n</div>";
    }
}

Modified as per Milo’s comment. I hadn’t thought of that.