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#include <iostream> #include <vector> #include <algorithm> #include <map> using namespace std; typedef long long ll; int main() { int n, K; cin >> n >> K; vector<int> v(n); map<int, int> cnt; for(int i = 0; i < n; i++) { cin >> v[i]; cnt[v[i]]++; } ll res = 0; for(int i = 0; i < n; i++) { res += cnt[v[i] + K]; } if(K == 0) { res -= n; res /= 2; } cout << res << endl; return 0; }
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