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+# 896. Monotonic Array
+#
+# An array is monotonic if it is either monotone increasing or monotone
+# decreasing.
+#
+# An array nums is monotone increasing if for all i <= j, nums[i] <= nums[j].
+# An array nums is monotone decreasing if for all i <= j, nums[i] >= nums[j].
+#
+# Given an integer array nums, return true if the given array is monotonic, or
+# false otherwise.
+
+# calcular a diferença entre os valores do primeiro e segundo indice.
+# guardar 1 se diferença for positiva (nums[1] - nums[0]) > 0
+# guardar -1 se diferença for negativa (nums[1] - nums[0]) < 0
+# guardar 0 se não houver diferença. actualizar no proximo calculo
+
+
+def isMonotonic(nums: list[int]) -> bool:
+    diff: int = 0
+    for index in range(1, len(nums)):
+        if diff:
+            if nums[index] - nums[index - 1] > 0 and diff < 0:
+                return False
+            if nums[index] - nums[index - 1] < 0 and diff > 0:
+                return False
+        else:
+            if nums[index] - nums[index - 1] > 0:
+                diff = 1
+            elif nums[index] - nums[index - 1] < 0:
+                diff = -1
+            else:
+                diff = 0
+    return True