201409-1 相邻数对 Java

两两比较，注意不要越界就行

import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int a[] = new int[n];
		for(int i=0;i<n;i++) {
			a[i] = sc.nextInt();
		}
		Arrays.sort(a);
		int count = 0;
		for(int j=1;j<n;j++) {
			if(a[j]-a[j-1] == 1) {
				count++;
			}
		}
		sc.close();
		System.out.println(count);
	}
}