PermCheck Demo Task at Codility.com

Lesson 2 – Counting Elements – PermCheck (permutation) demo task solution code written in php. Gives 100/100 score at the time of publishing. The description of the problem is copyrighted, so please see the following link for it: https://codility.com/demo/take-sample-test/perm_check

Solution in php:

function solution($A) {
    sort($A, SORT_NUMERIC);
    $i=0;
    $c = count($A);
    while($i < $c){
        if($i+1  $A[$i++]){
            return 0;
        }
    }
    return 1;
}

Given “AS IS”, can be ported from other languages from solutions found on the internet, please use with care.

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