FrogRiverOne Demo Task at Codility.com

Lesson 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])){
            $X--;
            $tiles[$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.

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