Submission #1127780

#	Time	Username	Problem	Language	Result	Execution time	Memory
1127780		marcus06	A Huge Tower (CEOI10_tower)	C++17	100 / 100	113 ms	5188 KiB

tower

#include <bits/stdc++.h>
using namespace std;
using lli = int64_t;

//replace with your directory
#ifdef LOCAL
#include <C:/Coding/CP/templates/content/debug/debug.h>
#else
#define debug(...)
#endif

const int mod = 1000000009;

void solve() {
    int n, d;
    cin >> n >> d;
    vector <int> a(n + 1);
    for (int i = 1; i <= n; ++i) {
        cin >> a[i];
    }
    sort(a.begin(), a.end());

    vector <int> dp(n + 1, 0);
    dp[0] = 1;
    for (int i = 1, j = 1; i <= n; ++i) {
        while (j < i && a[j] + d < a[i]) j++;
        dp[i] = 1LL * dp[i - 1] * (i - j + 1) % mod;
    }
    cout << dp[n] << '\n';
}

int main() {
    std::cin.tie(0)->sync_with_stdio(0);
#ifdef LOCAL
    auto begin = std::chrono::high_resolution_clock::now();
#endif

    int tt = 1;
    while (tt--) {
        solve();
    }

#ifdef LOCAL
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    std::cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n";
#endif

    return 0;
}

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