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Leetcode - 20. Valid Parentheses

· One min read

https://leetcode.com/problems/valid-parentheses/

Solution 1​

/**
 * @param {string} s
 * @return {boolean}
 */
var isValid = function (s) {
  if (s.length % 2 !== 0) {
    return false;
  }

  const stack = [];
  const brackets = {
    '(': ')',
    '{': '}',
    '[': ']',
  };

  for (let i = 0; i < s.length; i++) {
    if (Object.keys(brackets).includes(s[i])) {
      stack.push(s[i]);
    } else {
      if (brackets[stack[stack.length - 1]] === s[i]) {
        stack.pop();
      } else {
        return false;
      }
    }
  }
  return stack.length === 0;
};

Runtime: 240 ms

Memory Usage: 51.4 MB