Submission #1057829

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057829		firegirlwaterboy	A Huge Tower (CEOI10_tower)	C++14	100 / 100	100 ms	10668 KiB

tower

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;

ll MOD = 1e9 + 9;

void solve() {
    ll n, d;
    cin >> n >> d;
    vector<ll> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    ll r = 0, ans = 1;
    for (ll l = 0; l < n; l++) {
        while (r < n && a[r] - a[l] <= d) {
            r++;
        }
        r--;
        ans *= (r - l + 1);
        ans %= MOD;
    }
    cout << ans << "\n";
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
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• Subtask 10: 5 / 5
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• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
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• Subtask 19: 5 / 5
• Subtask 20: 5 / 5