const express = require('express');
const router = express.Router();

router.post('/', (req, res) => {
    const { input } = req.body;
    if (!Array.isArray(input) || input.length === 0)
        return res.status(400).json({ error: 'input must be a non-empty array' });
    res.json({ ret: Math.max(...input.map(Number)) });
});

module.exports = router;