14-09-1(相邻数对)

import java.util.*;
public class Main{
    
    
public static void main(String[] args){
    
    
 Scanner input = new Scanner(System.in);
 int n = input.nextInt();
 int[] a = new int[n];
 int count =0;
for(int i =0;i<n;i++){
    
    
a[i] = input.nextInt();
}
for(int i =0;i<n;i++){
    
    
  for(int j =0;j<n;j++){
    
    
if(a[i]-a[j] == 1)
count++;

}
}


System.out.print(count);
}//main
}//Main