[leetCode] 896. Monotonic Array (Python)

An array is monotonic if it is either monotone increasing or monotone decreasing.

An array A is monotone increasing if for all i <= j, A[i] <= A[j].  An array A is monotone decreasing if for all i <= j, A[i] >= A[j].

Return true if and only if the given array A is monotonic.

 

Example 1:

Input: [1,2,2,3]
Output: true

Example 2:

Input: [6,5,4,4]
Output: true

Example 3:

Input: [1,3,2]
Output: false

Example 4:

Input: [1,2,4,5]
Output: true

Example 5:

Input: [1,1,1]
Output: true

Note:

1. 1 <= A.length <= 50000
2. -100000 <= A[i] <= 100000

Solution

class Solution:
    def isMonotonic(self, A: List[int]) -> bool:
        reverse_flag = False
        
        if max(A) == A[0]:
            reverse_flag = True
        
        sorted_A = sorted(A, reverse=reverse_flag)
        
        if sorted_A == A:
            return True
        
        return False

 

SOMJANG/CODINGTEST_PRACTICE