제출 #762664

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
762664		Alma	A Huge Tower (CEOI10_tower)	C++17	100 / 100	102 ms	11228 KiB

tower

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

long long MOD = 1e9+9;

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

    int n, d;
    cin >> n >> d;

    vector<int> a(n), b(n);

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

    int k = 0;

    for (int i = 0; i < n; i++) {
        while (a[k] + d < a[i]) {
            k++;
        }
        b[i] = n-k-1;
    }

    for (int i = 0; i < n; i++) {
        b[i] = b[i] - (n-i) + 1;
        b[i]++;
    }

    long long ans = 1;
    for (int i = 0; i < n; i++) {
        ans *= max(b[i], 1);
        ans %= MOD;
    }

    cout << ans << endl;

    return 0;
}

• Subtask 1: 5 / 5
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