제출 #1057807

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1057807		firegirlwaterboy	A Huge Tower (CEOI10_tower)	C++14	30 / 100	67 ms	5212 KiB

tower

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;

ll MOD = 1e9 + 7;

void solve() {
    ll n, d;
    cin >> n >> d;
    vector<ll> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    ll r = 0, ans = 1;
    for (ll l = 0; l < n; l++) {
        while (r < n && a[r] - a[l] <= d) {
            r++;
        }
        r--;
        ans *= (r - l + 1);
        ans %= MOD;
    }
    cout << ans << "\n";
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}

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