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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