Question

How to check if an array is monotonic in C#

Answer 1

// check adjacent array elements to determine if the array is monotone increasing (or decreasing)

using System;

internal class Program
{
   internal static bool isMonotonic(int[] array) {
		int increase = 0, decrease = 0;
		int size = array.Length;

		for (int i = 0;i < size - 1; i++) {
			if (array[i] > array[i + 1]) {
				increase = 1;
			}
			if (array[i] < array[i + 1]) {
				decrease = 1;
			}
			if (increase == 1 && decrease == 1) {
				return false;
			}
		}

		return true;
   }

	public static void Main(string[] args)
	{
		int[] array = new int[] {1, 3, 4, 6, 8, 9, 11, 17, 18};

		Console.WriteLine(isMonotonic(array));
	}
}




/*
run:
 
true
 
*/

 

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