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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