제출 #985725

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
985725		AA_Surely	A Huge Tower (CEOI10_tower)	C++14	100 / 100	93 ms	10672 KiB

tower

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

#define FOR(i, x, n) for(int i = x; i < n; i++)
#define F0R(i, n) FOR(i, 0, n)
#define ROF(i, x, n) for(int i = n - 1; i >= x; i--)
#define R0F(i, n) ROF(i, 0, n)

#define WTF cout << "WTF" << endl

#define IOS ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define F first
#define S second
#define PB push_back
#define EP emplace_back

#define ALL(x) x.begin(), x.end()
#define RALL(x) x.rbegin(), x,rend()

using namespace std;

typedef long long LL;

typedef pair<int, int> PII;
typedef pair<LL, LL> PLL;

typedef vector<int> VI;
typedef vector<LL> VLL;
typedef vector<PII> VPII;
typedef vector<PLL> VPLL;

const int N = 1e6 + 7;
const int INF = 1e9 + 7;
const int LOG = 22;
const int A = 26;
const int SQ = 320;
const int MOD = 1e9 + 9;

LL n, d;

int main() {
    IOS;

    cin >> n >> d;
    VLL ns(n);
    F0R(i, n) cin >> ns[i];

    sort(ALL(ns));

    LL ptr = 0;
    LL ans = 1;
    F0R(i, n) {
        while(ptr < n && ns[ptr] <= ns[i] + d) ptr++;
        ans = (ans * (ptr - i)) % MOD;
    }

    cout << (ans + MOD) % MOD;
}

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