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  1. Prepare
  2. Data Structures
  3. Stacks
  4. Balanced Brackets
  5. Discussions

Balanced Brackets

  • misterjesusingl1
     + 0 comments

    php solution

    function isBalanced($s) {
    // Write your code here
    $stack = [];
    $left = ["(", "{", "["];
    $right = [")", "}", "]"];
    $len = strlen($s);
    for ($i = 0; $i < $len; $i++) {
        if (0 === $i && in_array($s[$i], $right)) {
            return "NO";
        }
        if (in_array($s[$i], $left)) {
            $stack[] = $s[$i];
            continue;
        }
        switch ($s[$i]) {
            case ")":
                if ($stack[count($stack) - 1] !== "(") {
                    return "NO";
                }
                break;
            case "}":
                if ($stack[count($stack) - 1] !== "{") {
                    return "NO";
                }
                break;
            case "]":
                if ($stack[count($stack) - 1] !== "[") {
                    return "NO";
                }
                break;
        }
        array_pop($stack);
    }
    return empty($stack) ? "YES" : "NO";
}