3151. Special Array I

Description

An array is considered special if every pair of its adjacent elements contains two numbers with different parity.

You are given an array of integers nums. Return true if nums is a special array, otherwise, return false.

 

Example 1:

Input: nums = [1]

Output: true

Explanation:

There is only one element. So the answer is true.

Example 2:

Input: nums = [2,1,4]

Output: true

Explanation:

There is only two pairs: (2,1) and (1,4), and both of them contain numbers with different parity. So the answer is true.

Example 3:

Input: nums = [4,3,1,6]

Output: false

Explanation:

nums[1] and nums[2] are both odd. So the answer is false.

 

Constraints:

• 1 <= nums.length <= 100
• 1 <= nums[i] <= 100

 

Solutions

Solution: Brute Force

• Time complexity: O(n)
• Space complexity: O(1)

 

JavaScript

/**
 * @param {number[]} nums
 * @return {boolean}
 */
const isArraySpecial = function (nums) {
  const n = nums.length;

  for (let index = 1; index < n; index++) {
    if (nums[index] % 2 === nums[index - 1] % 2) return false;
  }
  return true;
};