出现一个WA，佬们帮我看看

#include<iostream>
#include<algorithm>
#include<cstring>
#include<cstdio>
#include<cmath>
#include<unordered_map>

using namespace std;

typedef long long ll;

const int N = 2e5 + 10;

ll arr[N];

int n, m;

int main()
{
	cin >> n >> m;

	unordered_map<int, int>	rell;
	for (int i = 0; i < n; i++)
	{
		cin >> arr[i];
		int temp = arr[i] + m;
		rell[temp]++;
	}

	int res = 0;
	for (int i = 0; i < n; i++)
	{
		res += rell[arr[i]];
	}

	cout << res << endl;

	return 0;
}