제출 #1342983

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1342983		sumclo	A Huge Tower (CEOI10_tower)	C++20	30 / 100	69 ms	2628 KiB

tower

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const int MOD = 1e9 + 7;


int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, d;
    cin >> n >> d;
    vector<int> a(n);
    for (int &i: a) cin >> i;
    sort(a.begin(), a.end());

    int r = 0, sol = 1;
    for (int l = 0; l < n; l++) {
        while(r < n - 1 && a[r + 1] - a[l] <= d) r++;
        int dist = r - l + 1;
        sol = (sol * 1LL * dist) % MOD;
    }

    cout << sol << '\n';
}

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