1745. 单调数列

class Solution:
    """
    @param A: a array
    @return: is it monotonous
    """
    ‘‘‘
    大致思路:
    1.只需要验证是否是下一个一直是递增或者递减的即可，不满足直接返回Flase，否则True
    ‘‘‘
    def isMonotonic(self,A):
        IsAdd = None
        for i in range(len(A)-1):
            if i == 0 :
                if A[i+1] > A[i]:
                    IsAdd = True

                else:
                    IsAdd = False

            if IsAdd == True:
                if A[i+1] < A[i]:
                    return False
            elif IsAdd == False:
                if A[i+1] > A[i]:
                    return False
        return  True