201712-1 最小差值

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine());
        int[] numbers = new int[n];
        String[] line = scanner.nextLine().split(" ");
        for(int i = 0; i < n; i++){
            numbers[i] = Integer.parseInt(line[i]);
        }
        scanner.close();

        int min = Integer.MAX_VALUE;
        for(int i = 0; i < n; i++){
            int numI = numbers[i];
            for(int j = 0; j < n; j++){
                if(i == j)
                    continue;
                int numJ = numbers[j];
                int minus = Math.abs(numI - numJ);
                if(minus < min)
                    min = minus;
            }
        }
        System.out.println(min);
    }
}