function solve (numbers) {
    numbers.sort((a, b) => a - b);
    let len = numbers.length;
    let result = [];

    for (i = 0; i < len; i++) {
        if (i % 2 == 0) {
            let num = numbers.shift();
            result.push(num);
        } else {
            let num = numbers.pop();
            result.push(num);
        }
    }

    return result;
}