Question

How to find the minimum index of a repeating element in an array with C#

Answer 1

using System;
using System.Collections.Generic;

public class Program
{
	 public static int findMininimumIndex(int[] arr) {
		int minIndex = -1;

		ISet<int> set = new HashSet<int>();

		for (int i = arr.Length - 1; i >= 0; i--) {
			if (set.Contains(arr[i])) {
				minIndex = i;
			}
			else {
				set.Add(arr[i]);
			}
		}

		return minIndex;
	 }

	public static void Main(string[] args) {
		int[] arr = new int[] {3, 7, 8, 6, 9, 1, 8, 8, 6, 1, 1, 8};

		Console.Write(findMininimumIndex(arr));
	}
}




/*
run:
 
2
 
*/

 

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