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142.25 ms | 1390 KiB | 7 Q<?php
function isCorrect($string) {
$string{strlen($string)-1};
}
var_dump('()'{strlen($string)-1});
//assert(isCorrect('') === true);
//assert(isCorrect('()') === true);
//assert(isCorrect('{()}') === true);
//assert(isCorrect('{()}{}') === true);
//assert(isCorrect('(())') === true);
//assert(isCorrect('{({({({()})})})}') === true);
//assert(isCorrect('{(})') === false);