Submission #928255

#	Time	Username	Problem	Language	Result	Execution time	Memory
928255		Amirreza_Fakhri	A Huge Tower (CEOI10_tower)	C++17	30 / 100	9 ms	3176 KiB

tower

// 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 = 1e5+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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