Brackets Demo Task at Codility.com

Lesson 5 – Stacks and Queues – Brackets 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/brackets

Solution in php:

function solution($S) {
    if(empty($S)){
        return 1;
    }
    $S       = str_split($S);
    $matched = array("]" => "[", "}" => "{", ")" => "(");
    $to_push = array("[", "{", "(");
    $stack   = array();
    foreach($S as $v){
        if(in_array($v, $to_push)){
            $stack[] = $v;
        }
        else{
            if(!count($stack)){
                return 0;
            }
            elseif($matched[$v] != array_pop($stack)){
                return 0;
            }
        }
    }
    return !count($stack) ? 1 : 0;
}

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

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