Submission #1367176

#	Time	Username	Problem	Language	Result	Execution time	Memory
1367176		sbalushev	A Huge Tower (CEOI10_tower)	C++20	0 / 100	120 ms	2836 KiB

tower

#include <bits/stdc++.h>
using namespace std;
const int MOD = 1e9 + 9;
int main() {
    int n, d;
    cin >> n >> d;
    vector <int> v (n);
    for (int i = 0; i < n; i++) {
        cin >> v[i];
    }
    int ans = 1;
    for (int left = 0, right = 0; left < n; left++) {
        while (right < n - 1 && v[right + 1] - v[left] <= d) {
            right++;
        }


        ans = (ans * (right - left + 1)) % MOD;
    }

    cout << ans << endl;

}

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