Question

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

Answer 1

import java.util.Set;
import java.util.HashSet;

public class MyClass {
     public static int findMininimumIndex(int[] arr) {
        int minIndex = -1;
 
        Set<Integer> set = new HashSet<>();

        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 = {3, 7, 8, 6, 9, 1, 8, 8, 6, 1, 1, 8};
        
        System.out.print(findMininimumIndex(arr));
    }
}




/*
run:

2

*/

 

70+ SQL courses for beginners and professionals