2.9 KiB

Raw Blame History

id	title	challengeType	forumTopicId	dashedName
594dc6c729e5700999302b45	Balanced brackets	1	302230	balanced-brackets

--description--

Determine whether a generated string of brackets is balanced; that is, whether it consists entirely of pairs of opening/closing brackets (in that order), none of which mis-nest.

Examples:

Input	Output
`[]`	true
`][`	false
`[][]`	true
`][]`	false
`[]][[]`	false
`[[[[]]]]`	true

--hints--

isBalanced should be a function.

assert(typeof isBalanced === 'function');

isBalanced("[]") should return true.

assert(isBalanced(testCases[0]));

isBalanced("]][[[][][][]][") should return false.

assert(!isBalanced(testCases[1]));

isBalanced("[][[[[][][[[]]]]]]") should return true.

assert(isBalanced(testCases[2]));

isBalanced("][") should return false.

assert(!isBalanced(testCases[3]));

isBalanced("[[[]]]][[]") should return false.

assert(!isBalanced(testCases[4]));

isBalanced("][[]") should return false.

assert(!isBalanced(testCases[5]));

isBalanced("][[][]][[[]]") should return false.

assert(!isBalanced(testCases[6]));

isBalanced("[[][]]][") should return false.

assert(!isBalanced(testCases[7]));

isBalanced("[[[]]][[]]]][][[") should return false.

assert(!isBalanced(testCases[8]));

isBalanced("[]][[]]][[[[][]]") should return false.

assert(!isBalanced(testCases[9]));

isBalanced("][]][[][") should return false.

assert(!isBalanced(testCases[10]));

isBalanced("[[]][[][]]") should return true.

assert(isBalanced(testCases[11]));

isBalanced("[[]]") should return true.

assert(isBalanced(testCases[12]));

isBalanced("]][]][[]][[[") should return false.

assert(!isBalanced(testCases[13]));

isBalanced("][]][][[") should return false.

assert(!isBalanced(testCases[14]));

isBalanced("][][") should return false.

assert(!isBalanced(testCases[15]));

isBalanced("[]]]") should return false.

assert(!isBalanced(testCases[16]));

isBalanced("") should return true.

assert(isBalanced(testCases[17]));

--seed--

--after-user-code--

const testCases = [
  '[]',
  ']][[[][][][]][',
  '[][[[[][][[[]]]]]]',
  '][',
  '[[[]]]][[]',
  '][[]',
  '][[][]][[[]]',
  '[[][]]][',
  '[[[]]][[]]]][][[',
  '[]][[]]][[[[][]]',
  '][]][[][',
  '[[]][[][]]',
  '[[]]',
  ']][]][[]][[[',
  '][]][][[',
  '][][',
  '[]]]',
  ''
];

--seed-contents--

function isBalanced(str) {

  return true;
}

--solutions--

function isBalanced(str) {
  if (str === '') return true;
  let a = str;
  let b;
  do {
    b = a;
    a = a.replace(/\[\]/g, '');
  } while (a !== b);
  return !a;
}

2.9 KiB Raw Blame History