坑人的最后一个点

#include<cstdio>
#include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
#include<cstring>
using namespace std;
int main(){
     long int n,m;
     scanf("%ld %ld",&n,&m);
     long int a[n+1];
     long int i,j,ans=0;
     for(i=1;i<=n;i++){
         scanf("%ld",&a[i]);
     }
     for(i=1;i<=n;i++){
         for(j=i+1;j<=n;j++){
             if(fabs(a[i]-a[j])==m)
             ans++;
         }
     }
     cout<<ans<<endl;
     return 0;
}