Submission #1237861

#	Time	Username	Problem	Language	Result	Execution time	Memory
1237861		luminescent	A Huge Tower (CEOI10_tower)	C++17	100 / 100	173 ms	5260 KiB

tower

// Source: https://usaco.guide/general/io

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

int main() {
    long long n, k; cin >> n >> k;
    long long arr[n];
    long long mod = 1e9+9;
    for (long long i =0 ; i< n; i++) {
        cin >> arr[i];
    }
    //
    sort(arr, arr+n);
    //
    long long output = 1;
    long long l = 0;
    for (long long r = 0; r < n; r++) {
        while (arr[r]-arr[l] > k) {
            l++;
        }
        output *= (r-l+1);
        output %= mod;
    }
    cout << output;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
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• Subtask 20: 5 / 5