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MaxProfit Demo Task at Codility.com

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Codility.com Tests 100/100 Solutions

Lesson 7 – Maximum slice problem – MaxProfit 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/max_profit

Solution in php:

function solution($A) {
    $cnt = count($A);
    if($cnt == 1 || $cnt == 0){
        return 0;

    $max_so_far = 0;
    $max_ending_here = 0;
    $min_price = $A[0];

    for($i = 1; $i < $cnt; $i++){
        $max_ending_here = max(0, $A[$i] - $min_price);
        $min_price = min($min_price, $A[$i]);
        $max_so_far = max($max_ending_here, $max_so_far);

    return $max_so_far;

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: //x20x.co.uk/2014/02/why-i-refuse-to-use-codility-and-so-should-you/

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