896. Monotonic Array

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.

判断一个数列是否单调，on直接做就行

class Solution(object):
    def isMonotonic(self, A):
        """
        :type A: List[int]
        :rtype: bool
        """
        incre = True
        descre = True
        for i in range(1, len(A), 1):
            if A[i] < A[i - 1]:
                incre = False
            if A[i] > A[i - 1]:
                descre = False
        return incre | descre