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FrogRiverOne Demo Task at Codility.com

codility netbeansLesson 2 – Counting Elements – FrogRiverOne (a small frog wants to get to the other side of a river) 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: //codility.com/demo/take-sample-test/frog_river_one

Solution in php:

function solution($X, $A) {
    $tiles  = array();
    for ($i = 0; $i < count($A); $i++){
        $j = $A[$i] - 1;
        if (!isset($tiles[$j])){
            $tiles[$j] = true;
        if (!$X){
            return $i;
    return -1;

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

Please note: we think that codility.com does not give a correct assessment of your real-world programming skills. For instance, reading the below would bring more understanding why: //codility-test-questions.blogspot.com/2013/01/my-experience-with-codility-test.html

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