76分，求助T.T

#include <bits/stdc++.h>
using namespace std;
long long a[200001];
int main()
{
	long long c, l = 0;
    int n;
	cin >> n >> c;
	for(int i = 1; i <= n; i++)
	{
		cin >> a[i];
		for(int j = i - 1; j > 0; j--)
		{
			if(a[i] - a[j] == c or a[i] - a[j] == -1 * c)
			{
				l += 1;
			}
		}
	}
	cout << l;
	return 0;
}