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@ 2019-04-02T01:58:59Z

<?php

function solution($set) {
    $diff = array_diff(range(1, max($set)), $set);
    sort($diff);
    return !isset($diff[0]) ? max($set) + 1 : ($diff[0] < 1 ? 1 : $diff[0]);
}

echo solution([39, 68, 47, 2, 19, 64]).PHP_EOL;

echo solution([1, 3, 6, 4, 1, 2]).PHP_EOL;

echo solution([1, 2, 3]).PHP_EOL;

echo solution([-1, -3]).PHP_EOL;

Output
Performance
VLD
References
Branches

sort: documentation ( source)
max: documentation ( source)
array_diff: documentation ( source)
range: documentation ( source)

preferences:dark modelive previewkey bindings

52.73 ms | 1393 KiB | 5 Q