제출 #1091474

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1091474		DottedHawk	A Huge Tower (CEOI10_tower)	C++17	100 / 100	192 ms	11348 KiB

tower

#include <iostream>
#include<algorithm>
#include <vector>
using namespace std;
typedef long long ll;

int main() {
    #ifdef LOCAL
    freopen("IO/input.txt", "r", stdin);
    #endif

    ll n,d; cin >> n >> d;
    vector<ll> V(n);

    for(auto& x: V) {
        cin >> x;
    }

    sort(V.begin(), V.end());
    ll ans = 1;
    //btwn 7 and 7-d inclusive
    auto lt = V.begin();

    for(auto rt = V.begin(); rt != V.end(); ++rt) {
        while((*rt - *lt)>d) {
            ++lt;
        } 
        ans *= ((rt-lt)+1);
        ans %= (1000000009);
    }

    cout << ans;
}

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