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

Difficulty: EASY
Tags: Data structures
Skill types: Data structures

Starter code:
class Solution:
    def isMonotonic(self, A: List[int]) -> bool:
        

Solutions:
class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if not A:
			return True
		increasing = True
		index = 0
		while index < len(A) - 1 and A[index] == A[index + 1]:
			index += 1
		if index == len(A) - 1:
			return True
		if A[index] > A[index + 1]:
			increasing = False
		for i in range(len(A) - 1):
			if increasing:
				if A[i] > A[i + 1]:
					return False
			elif A[i] < A[i + 1]:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		n = len(A)
		if self.checkMonInc(A, n) or self.checkMonDec(A, n):
			return True
		return False

	def checkMonInc(self, A, n):
		for i in range(1, n):
			if A[i] >= A[i - 1]:
				continue
			else:
				return False
		return True

	def checkMonDec(self, A, n):
		for i in range(1, n):
			if A[i] <= A[i - 1]:
				continue
			else:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		is_asc = True
		is_desc = True
		for i in range(len(A) - 1):
			if A[i] > A[i + 1]:
				is_asc = False
			if A[i] < A[i + 1]:
				is_desc = False
		return is_asc or is_desc


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) == 1:
			return True
		direction = 0
		for i in range(len(A) - 1):
			j = i + 1
			tmp = A[i] - A[j]
			if tmp == 0:
				continue
			elif tmp > 0:
				if direction == 0 or direction == -1:
					direction = -1
				else:
					return False
			elif direction == 0 or direction == 1:
				direction = 1
			else:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		increasing = all((A[i] <= A[i + 1] for i in range(len(A) - 1)))
		decreasing = all((A[i] >= A[i + 1] for i in range(len(A) - 1)))
		return increasing or decreasing


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		increasing = decreasing = True
		for (i, value) in enumerate(A):
			if i:
				if value > A[i - 1]:
					increasing = False
				if value < A[i - 1]:
					decreasing = False
			if not increasing and (not decreasing):
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		monotonic = 2
		lenA = len(A)
		for i in range(lenA - 1):
			if A[i] > A[i + 1]:
				monotonic -= 1
				break
		for i in range(lenA - 1):
			if A[i] < A[i + 1]:
				monotonic -= 1
				break
		return monotonic


class Solution(object):

	def isMonotonic(self, A):
		increasing = decreasing = True
		for i in range(len(A) - 1):
			if A[i] > A[i + 1]:
				increasing = False
			if A[i] < A[i + 1]:
				decreasing = False
		return increasing or decreasing


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		prev = 0
		cur = 1
		while cur < len(A):
			if A[prev] <= A[cur]:
				prev += 1
				cur += 1
			else:
				break
		if cur >= len(A):
			return True
		prev = 0
		cur = 1
		while cur < len(A):
			if A[prev] >= A[cur]:
				prev += 1
				cur += 1
			else:
				break
		if cur >= len(A):
			return True
		return False


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		(i, j) = (0, 0)
		(tempi, tempj) = (-100000, 100000)
		(flagi, flagj) = (True, True)
		while i < len(A) and j < len(A):
			if tempi <= A[i]:
				tempi = A[i]
			else:
				flagi = False
			if tempj >= A[j]:
				tempj = A[j]
			else:
				flagj = False
			i += 1
			j += 1
		return flagi or flagj


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if A == sorted(A) or A == sorted(A, reverse=True):
			return 1
		return 0


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		flow = None
		for i in range(len(A) - 1):
			if A[i] > A[i + 1]:
				if not flow:
					flow = 'd'
				elif flow != 'd':
					return False
				continue
			if A[i] < A[i + 1]:
				if not flow:
					flow = 'i'
				elif flow != 'i':
					return False
				continue
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if sorted(A) == A or sorted(A, reverse=True) == A:
			return True
		else:
			return False


class Solution:

	def isMonotonic(self, a: List[int]) -> bool:
		n = len(a)
		std = 0
		for i in range(0, n - 1):
			sgn = a[i] - a[i + 1]
			if sgn == 0:
				continue
			sgn = abs(sgn) / sgn
			if std == 0:
				std = sgn
			if sgn != std and sgn != 0:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		res = ''
		for x in range(1, len(A)):
			if A[x] > A[x - 1]:
				res = 'pos'
			elif A[x] == A[x - 1]:
				continue
			else:
				res = 'neg'
		if res != 'pos' and res != 'neg':
			return True
		for x in range(1, len(A)):
			if res == 'neg':
				if A[x] > A[x - 1]:
					return False
				else:
					continue
			elif A[x] < A[x - 1]:
				return False
			else:
				continue
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) == 1:
			return True
		i = 0
		while i < len(A) - 1 and A[i] == A[i + 1]:
			i += 1
		if i >= len(A) - 1:
			return True
		if A[i] > A[i + 1]:
			while i < len(A) - 1:
				if A[i] < A[i + 1]:
					return False
				i += 1
			return True
		else:
			while i < len(A) - 1:
				if A[i] > A[i + 1]:
					return False
				i += 1
			return True


class Solution:

	def isMonotonic(self, arr: List[int]) -> bool:
		length = len(arr)
		dec = inc = 1
		for i in range(length - 1):
			if arr[i] < arr[i + 1]:
				dec += 1
			elif arr[i] > arr[i + 1]:
				inc += 1
			else:
				dec += 1
				inc += 1
		if dec == length:
			return True
		elif inc == length:
			return True
		else:
			return False


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		diff_lst = [A[i + 1] - A[i] for i in range(len(A) - 1)]
		positive = all((i >= 0 for i in diff_lst))
		negative = all((i <= 0 for i in diff_lst))
		return positive or negative


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		dec = False
		for i in range(len(A) - 1):
			if A[i] < A[i + 1]:
				dec = True
		for i in range(len(A) - 1):
			if A[i] > A[i + 1] and dec:
				return False
		return True


class Solution:

	def isMonotonic(self, A):
		is_monotonic_asc = True
		is_monotonic_desc = True
		for i in range(1, len(A)):
			if A[i] < A[i - 1]:
				is_monotonic_asc = False
			if A[i] > A[i - 1]:
				is_monotonic_desc = False
		return is_monotonic_asc or is_monotonic_desc


class Solution:

	def isMonotonic(self, a: List[int]) -> bool:
		isIncreasing = isDecreasing = True
		for i in range(len(a) - 1):
			if a[i] < a[i + 1]:
				isIncreasing = False
			if a[i] > a[i + 1]:
				isDecreasing = False
		return isIncreasing or isDecreasing


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if A[-1] > A[0]:
			inc = True
			for i in range(0, len(A) - 1):
				if A[i] > A[i + 1]:
					return False
			else:
				return True
		else:
			dec = True
			for i in range(0, len(A) - 1):
				if A[i] < A[i + 1]:
					return False
			else:
				return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		isAscending = True
		isDescending = True
		for i in range(len(A) - 1):
			if A[i] > A[i + 1]:
				isAscending = False
			if A[i] < A[i + 1]:
				isDescending = False
		return isAscending or isDescending


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		asc = True
		dsc = True
		for i in range(1, len(A)):
			if A[i - 1] < A[i]:
				dsc = False
			elif A[i - 1] > A[i]:
				asc = False
		return asc or dsc


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		is_increasing = is_decreasing = True
		for i in range(1, len(A)):
			if A[i] < A[i - 1]:
				is_decreasing = False
			if A[i] > A[i - 1]:
				is_increasing = False
		return is_decreasing or is_increasing


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		increasing = decreasing = True
		for i in range(len(A) - 1):
			if A[i] > A[i + 1]:
				increasing = False
			if A[i] < A[i + 1]:
				decreasing = False
		return increasing or decreasing


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		isIncreasing = True
		isDecreasing = True
		index = 1
		while index < len(A):
			previous = index - 1
			current = index
			if A[previous] < A[current]:
				isDecreasing = False
			if A[previous] > A[current]:
				isIncreasing = False
			index += 1
		return isIncreasing or isDecreasing


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		len_ = len(A)
		if len_ == 0 or len_ == 1 or len_ == 2:
			return True
		(f, l) = (A[0], A[-1])
		prev = f
		for n in A[1:]:
			if f < l:
				if n < prev:
					return False
			if f > l:
				if n > prev:
					return False
			if f == l:
				if n != prev:
					return False
			prev = n
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		dec = False
		inc = False
		for i in range(len(A) - 1):
			j = i + 1
			if A[i] is not A[j]:
				if A[i] < A[j]:
					inc = True
				elif A[i] > A[j]:
					dec = True
			if inc and dec:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) == 0:
			return False
		if len(A) == 1:
			return True
		incr = 0
		for i in range(1, len(A)):
			if A[i] - A[i - 1] > 0 and incr == 0:
				incr = 1
			elif A[i] - A[i - 1] > 0 and incr == -1:
				return False
			elif A[i] - A[i - 1] < 0 and incr == 0:
				incr = -1
			elif A[i] - A[i - 1] < 0 and incr == 1:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) < 3:
			return True
		i = 0
		while i < len(A) - 1 and A[i] == A[i + 1]:
			i += 1
		if i == len(A) - 1:
			return True
		asc = A[i] < A[i + 1]
		for j in range(i, len(A) - 1):
			if A[j] == A[j + 1]:
				continue
			tmp = A[j] < A[j + 1]
			if tmp != asc:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		icounter = 0
		dcounter = 0
		for i in range(len(A) - 1):
			if A[i] > A[i + 1]:
				dcounter += 1
			if A[i] < A[i + 1]:
				icounter += 1
			if A[i] == A[i + 1]:
				icounter += 1
				dcounter += 1
		if icounter == len(A) - 1 or dcounter == len(A) - 1:
			return True
		return False


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:

		def isIncreasing(self, A: List[int]) -> bool:
			mono = True
			for i in range(len(A)):
				if i == len(A) - 1:
					break
				if A[i] > A[i + 1]:
					mono = False
			return mono

		def isDecreasing(self, A: List[int]) -> bool:
			m = True
			for i in range(len(A)):
				if i == len(A) - 1:
					break
				if A[i] < A[i + 1]:
					m = False
			return m
		if isDecreasing(self, A) or isIncreasing(self, A):
			return True
		return False


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if not A or len(A) < 2:
			return True
		self.direction = None
		return self.isMonotonicHelper(A, 0, len(A) - 1)

	def isMonotonicHelper(self, A, start, end):
		if start < end:
			mid = (start + end) // 2
			if self.isMonotonicHelper(A, start, mid) and self.isMonotonicHelper(A, mid + 1, end):
				if self.direction is None:
					if A[mid] < A[mid + 1]:
						self.direction = 1
					elif A[mid] > A[mid + 1]:
						self.direction = 0
					return True
				elif self.direction == 1:
					return A[mid] <= A[mid + 1]
				else:
					return A[mid] >= A[mid + 1]
			else:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if min(A) == A[0]:
			start = 0
			increment = 1
			end = len(A)
		elif max(A) == A[0]:
			start = len(A) - 1
			increment = -1
			end = 0
		else:
			return False
		num = A[start]
		print(start, num)
		for i in range(start, end, increment):
			print(A[i], num)
			if A[i] < num:
				return False
			num = A[i]
		return True


class Solution:

	def check(self, B):
		self.B = B
		result = []
		for i in range(len(self.B) - 1):
			if self.B[i] <= self.B[i + 1]:
				result.append(True)
			else:
				result.append(False)
		final = all(result)
		return final

	def isMonotonic(self, A: List[int]) -> bool:
		a = []
		a.append(self.check(A))
		a.append(self.check(A[::-1]))
		b = any(a)
		return b


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		climb = None
		bef = None
		for num in A:
			if bef is None:
				pass
			elif climb is None and num > bef:
				climb = True
			elif climb is None and num < bef:
				climb = False
			elif climb is None and num == bef:
				pass
			elif climb is True and num >= bef:
				pass
			elif climb is False and num <= bef:
				pass
			else:
				return False
			bef = num
		return True


class Solution:

	def isMonotonic(self, arr: List[int]) -> bool:
		f = True
		n = len(arr)
		for i in range(n - 1):
			if arr[i] > arr[i + 1]:
				f = False
				break
		if f:
			return True
		r = True
		for i in range(n - 1):
			if arr[i] < arr[i + 1]:
				r = False
				break
		return r


def isMono(A, forward=True):
	curValue = A[0]
	for i in range(1, len(A)):
		if forward and A[i] < curValue:
			return False
		if not forward and A[i] > curValue:
			return False
		curValue = A[i]
	return True

class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		return isMono(A) or isMono(A, False)


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		res1 = sorted(A, reverse=True)
		res2 = sorted(A)
		if res1 == A or res2 == A:
			return True
		return False


class Solution(object):

	def isMonotonic(self, A):
		return all((A[i] <= A[i + 1] for i in range(len(A) - 1))) or all((A[i] >= A[i + 1] for i in range(len(A) - 1)))


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		(increase, decrease) = (True, True)
		for i in range(1, len(A)):
			if A[i] > A[i - 1]:
				decrease = False
			if A[i] < A[i - 1]:
				increase = False
		return increase or decrease


class Solution(object):

	def isMonotonic(self, A):
		monotonicIncr = True
		monotonicDecr = True
		for i in range(len(A) - 1):
			j = i + 1
			if A[i] > A[j]:
				monotonicIncr = False
			if A[i] < A[j]:
				monotonicDecr = False
		return monotonicIncr or monotonicDecr


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		increasing = True
		for (x, y) in zip(A, A[1:]):
			if x > y:
				increasing = False
				break
		decreasing = True
		for (x, y) in zip(A, A[1:]):
			if x < y:
				decreasing = False
				break
		return increasing or decreasing


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if A[-1] - A[0] > 0:
			signal = 'incr'
		elif A[-1] - A[0] == 0:
			signal = 'same'
		elif A[-1] - A[0] < 0:
			signal = 'decr'
		if signal == 'same':
			if A == [A[0]] * len(A):
				return True
			else:
				return False
		elif signal == 'incr':
			for i in range(1, len(A)):
				if A[i] < A[i - 1]:
					return False
			return True
		elif signal == 'decr':
			for i in range(1, len(A)):
				if A[i] > A[i - 1]:
					return False
			return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		count = 0
		count2 = 0
		for x in range(len(A) - 1):
			if A[x] <= A[x + 1]:
				count += 1
			if A[x] >= A[x + 1]:
				count2 += 1
				print(count2, A[x])
		if count == len(A) - 1 or count2 == len(A) - 1:
			return True
		else:
			return False


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		inc = False
		i = 0
		while i < len(A) - 1 and A[i] == A[i + 1]:
			i += 1
		if i == len(A) - 1:
			return True
		if A[i] < A[i + 1]:
			inc = True
		for i in range(1, len(A) - 1):
			if inc == True:
				if A[i] > A[i + 1]:
					return False
			if inc == False:
				if A[i + 1] > A[i]:
					return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		B = A.copy()
		A.sort()
		if A == B or A[::-1] == B:
			return True
		return False


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		up = False
		if A[0] < A[len(A) - 1]:
			up = True
		elif A[0] > A[len(A) - 1]:
			up = False
		for i in range(len(A) - 1):
			if up:
				print((A[i], A[i + 1]))
				if A[i] > A[i + 1]:
					return False
			elif A[i] < A[i + 1]:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		up = down = True
		for i in range(1, len(A)):
			if A[i - 1] > A[i]:
				up = False
			if A[i - 1] < A[i]:
				down = False
		return up or down


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		is_monotonic_incr = True
		is_monotonic_desc = True
		array1 = A
		for num in range(1, len(array1)):
			if array1[num] < array1[num - 1]:
				print('in first if', array1[num], array1[num - 1])
				is_monotonic_incr = False
			if array1[num] > array1[num - 1]:
				print('in second if', array1[num], array1[num - 1])
				is_monotonic_desc = False
		return is_monotonic_incr or is_monotonic_desc


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		return A == sorted(A) or A == sorted(A, reverse=True)


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if not A:
			return True
		(isIncrementing, prev) = (None, A[0])
		for i in range(1, len(A)):
			print(prev, A[i], isIncrementing)
			if prev < A[i] and isIncrementing == False:
				return False
			if prev > A[i] and isIncrementing == True:
				return False
			if prev < A[i]:
				isIncrementing = True
			if prev > A[i]:
				isIncrementing = False
			prev = A[i]
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		sort = sorted(A)
		return A == sort or A[::-1] == sort


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		direction = 0
		for (idx, ele) in enumerate(A):
			if idx == 0:
				continue
			if ele > A[idx - 1] and direction == 0:
				direction = 1
			elif ele < A[idx - 1] and direction == 0:
				direction = -1
			elif ele > A[idx - 1] and direction == -1:
				return False
			elif ele < A[idx - 1] and direction == 1:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		i = 1
		pr = None
		cur = None
		if len(A) < 3:
			return True
		while i < len(A) - 1:
			if A[i] > A[i - 1] and A[i] > A[i + 1]:
				return False
			elif A[i] < A[i - 1] and A[i] < A[i + 1]:
				return False
			elif A[i] >= A[i - 1] and A[i] < A[i + 1] or (A[i] > A[i - 1] and A[i] <= A[i + 1]):
				cur = 'I'
			elif A[i] <= A[i - 1] and A[i] > A[i + 1] or (A[i] < A[i - 1] and A[i] >= A[i + 1]):
				cur = 'D'
			if pr is None and cur is not None:
				pr = cur
			elif pr is not None and cur is not None and (pr != cur):
				return False
			i += 1
		return True


class Solution:

	def monotonicArrayIncreasing(self, a):
		i = 0
		while i + 1 < len(a):
			if a[i] > a[i + 1]:
				return False
			i += 1
		return True

	def monotonicArrayDecreasing(self, a):
		i = 0
		while i + 1 < len(a):
			if a[i] < a[i + 1]:
				return False
			i += 1
		return True

	def isMonotonic(self, A: List[int]) -> bool:
		x = self.monotonicArrayDecreasing(A)
		y = self.monotonicArrayIncreasing(A)
		return x or y


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		increasing = None
		for i in range(1, len(A)):
			if increasing is None:
				if A[i] != A[i - 1]:
					increasing = A[i] > A[i - 1]
			elif increasing and A[i] < A[i - 1]:
				return False
			elif not increasing and A[i] > A[i - 1]:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) < 2:
			return True
		increasing = None
		previous = A[0]
		for element in A[1:]:
			if increasing == True and element < previous:
				return False
			if increasing == False and element > previous:
				return False
			if increasing is None and element != previous:
				increasing = element > previous
			previous = element
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		ans = True
		n = len(A)
		if n <= 2:
			return ans
		left = True
		right = True
		for i in range(1, n):
			if A[i] > A[i - 1]:
				left = False
				break
		for i in range(1, n):
			if A[i] < A[i - 1]:
				right = False
				break
		return left or right


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) < 3:
			return True
		gt = False
		lt = False
		for i in range(len(A) - 1):
			if A[i] > A[i + 1]:
				gt = True
			if A[i] < A[i + 1]:
				lt = True
			if gt and lt:
				return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) <= 1:
			return True
		flag = -1
		if A[0] < A[1]:
			flag = 0
		elif A[0] == A[1]:
			flag = 1
		else:
			flag = 2
		for i in range(0, len(A) - 1):
			if flag == 0 and A[i] > A[i + 1]:
				return False
			elif flag == 2 and A[i] < A[i + 1]:
				return False
			elif flag == 1:
				if A[i] > A[i + 1]:
					flag = 2
				elif A[i] < A[i + 1]:
					flag = 0
				else:
					flag = 1
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) <= 1:
			return True
		last_diff = 0
		for i in range(1, len(A)):
			cur_diff = A[i] - A[i - 1]
			if cur_diff < 0:
				if last_diff == 0:
					last_diff = cur_diff
				elif last_diff > 0:
					return False
			elif cur_diff > 0:
				if last_diff == 0:
					last_diff = cur_diff
				elif last_diff < 0:
					return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		flag = None
		for i in zip(A, A[1:]):
			temp = i[1] - i[0]
			if flag:
				if flag * temp < 0:
					return False
			elif temp > 0:
				flag = 1
			elif temp < 0:
				flag = -1
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		monotone = 0
		for i in range(len(A) - 1):
			m = A[i + 1] - A[i]
			if m * monotone < 0:
				return False
			if monotone == 0 and m != 0:
				monotone = 1 if m > 0 else -1
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		increase = []
		decrease = []
		(i, d) = ([], [])
		for (idx, v) in enumerate(A):
			while decrease and decrease[-1][0] >= v:
				(dv, di) = decrease.pop()
				if not d:
					d.append((dv, di))
				elif d[-1][1] < di:
					d.append((dv, di))
			decrease.append((v, idx))
			while increase and increase[-1][0] <= v:
				(iv, ii) = increase.pop()
				if not i:
					i.append((iv, ii))
				elif i[-1][1] < ii:
					i.append((iv, ii))
			increase.append((v, idx))
		if decrease and len(decrease) == 1:
			g = decrease.pop()
			if d and d[-1][0] >= g[0]:
				d.append(g)
			else:
				d.append(g)
		if increase and len(increase) == 1:
			g = increase.pop()
			if i and i[-1][0] <= g[0]:
				i.append(g)
			else:
				i.append(g)
		return len(i) == len(A) or len(d) == len(A)


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		i = 0
		j = 1
		if A.index(min(A)) == 0 or A.index(min(A)) == len(A) - 1 or min(A) == A[-1]:
			if A.index(min(A)) == 0:
				while j <= len(A) - 1:
					if A[i] <= A[j]:
						i = i + 1
						j = j + 1
					else:
						return False
			elif A.index(min(A)) == len(A) - 1 or min(A) == A[-1]:
				while j <= len(A) - 1:
					if A[i] >= A[j]:
						i = i + 1
						j = j + 1
					else:
						return False
		else:
			return False
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) < 2:
			return True
		increasing = False
		decreasing = False
		i = 0
		while i < len(A) - 1 and (not increasing and (not decreasing)):
			if A[i] == A[i + 1]:
				i += 1
				continue
			if A[i] < A[i + 1]:
				increasing = True
			else:
				decreasing = True
			i += 1
		if increasing:
			while i < len(A) - 1:
				if A[i] > A[i + 1]:
					return False
				i += 1
			return True
		if decreasing:
			while i < len(A) - 1:
				if A[i] < A[i + 1]:
					return False
				i += 1
			return True
		if not increasing and (not decreasing):
			return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		inc = True
		dec = True
		for i in range(len(A) - 1):
			if A[i + 1] - A[i] > 0:
				inc = inc and True
				dec = False
			elif A[i + 1] - A[i] < 0:
				dec = dec and True
				inc = False
		return inc or dec


from enum import Enum

class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) <= 2:
			return True

		class Comp(Enum):
			inc = 0
			eq = 1
			dec = 2

		def to_comp(left, right):
			if right > left:
				return Comp.inc
			elif right == left:
				return Comp.eq
			else:
				return Comp.dec
		comp = to_comp(A[0], A[1])
		for i in range(2, len(A)):
			new_comp = to_comp(A[i - 1], A[i])
			if new_comp == Comp.inc and comp == Comp.dec:
				return False
			elif new_comp == Comp.dec and comp == Comp.inc:
				return False
			if new_comp != Comp.eq:
				comp = new_comp
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) <= 2:
			return True
		d = A[1] - A[0]
		for i in range(1, len(A) - 1):
			new_d = A[i + 1] - A[i]
			if new_d * d < 0:
				return False
			if new_d != 0:
				d = new_d
		return True


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		length = len(A)
		monotone_inc = True
		monotone_dec = True
		for i in range(length - 1):
			if A[i + 1] >= A[i]:
				continue
			else:
				monotone_inc = False
		for i in range(length - 1):
			if A[i + 1] <= A[i]:
				continue
			else:
				monotone_dec = False
		return monotone_inc or monotone_dec


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		(inc, dec) = (True, True)
		for i in range(1, len(A)):
			(a, b) = (A[i], A[i - 1])
			inc = inc & (a >= b)
			dec = dec & (a <= b)
			if not (inc or dec):
				return False
		return inc or dec


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) == 1:
			return 1
		dir = 0
		for (i, j) in zip(A, A[1:] + [A[len(A) - 1]]):
			if i != j:
				cdir = (i - j) / abs(i - j)
				if dir == 0:
					dir = cdir
				elif dir != cdir:
					return 0
		return 1


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		import numpy as np
		if len(A) == 1:
			return True
		else:
			diff = np.diff(A)
			return min(diff) >= 0 or max(diff) <= 0


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		(a1, a2) = (sorted(A), sorted(A, reverse=True))
		if A == a1 or A == a2:
			return True
		return False


class Solution:

	def isMonotonic(self, A: List[int]) -> bool:
		if len(A) < 2:
			return True
		asc = None
		for i in range(1, len(A)):
			if A[i] == A[i - 1]:
				continue
			if asc is None:
				asc = A[i - 1] < A[i]
			elif asc != (A[i - 1] < A[i]):
				return False
		return True