이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
// In the name of the God
#include <bits/stdc++.h>
#define ll long long
#define int long long
#define pb push_back
#define F first
#define S second
#define mp make_pair
#define pii pair <int, int>
#define smin(x, y) (x) = min((x), (y))
#define smax(x, y) (x) = max((x), (y))
#define all(x) (x).begin(), (x).end()
using namespace std;
const int inf = 1e9+7;
const int mod = 998244353;
const int maxn = 1e6+5;
int n, d, a[maxn];
int32_t main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n >> d;
for (int i = 0; i < n; i++) cin >> a[i];
sort(a, a+n);
int ans = 1, cur = 0;
for (int i = 0; i < n; i++) {
while (cur < i and a[cur] < a[i]-d) cur++;
ans = (ans*(i-cur+1))%inf;
}
cout << ans << '\n';
return 0;
}
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