Solution style guide

A solution should show one clear working answer and explain the decisions that matter. It should not only paste code or repeat the task.

For runnable PHP, keep expected output inside the same block. Explain edge cases immediately after the code. When several approaches are valid, lead with the clearest beginner-appropriate answer and briefly name the tradeoff.

Practical Example

<?php

declare(strict_types=1);

$solution = [
    'steps' => ['validate input', 'calculate result', 'print output'],
    'shows_reasoning' => true,
];

echo implode(' -> ', $solution['steps']) . PHP_EOL;

// Prints:
// validate input -> calculate result -> print output

This outline is not enough by itself. A real solution must connect each important step to the exercise requirement and explain why its edge-case handling belongs there.