PassingCars Demo Task at Codility.com

Lesson 3 – Prefix Sums – PassingCars 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/passing_cars

Solution in php:

function solution($A){
    $east    = 0;
    $passing = 0;
    foreach($A as &$v){
        if($v == 1){
            $passing += $east;
        }
        else{
            $east++;
        }
    }
    if($passing > 1000000000 || $passing < 0){
        return -1;
    }
    else{
        return intval($passing);
    }
}

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

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