3151. Special Array I

Problem Link

Description

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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

Solution

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Python3

class Solution:
    def isArraySpecial(self, nums: List[int]) -> bool:
        N = len(nums)
 
        for i in range(N - 1):
            a, b = nums[i] % 2, nums[i + 1] % 2
 
            if a == b:
                return False
        
        return True