Submission #373603

#	Time	Username	Problem	Language	Result	Execution time	Memory
373603		randomjohnnyh	A Huge Tower (CEOI10_tower)	C++14	100 / 100	320 ms	8812 KiB

tower

#include <bits/stdc++.h>

using namespace std;

const int MOD = 1e9 + 9;

int main () {
	int n, d;
	cin >> n >> d;
	vector<int> ar(n);
	for (int i = 0; i < n; i++) {
		cin >> ar[i];
	}
	sort(ar.begin(), ar.end()); //sort the blocks
	long long r = 0, sol = 1;
	for (int l = 0; l < n; l++) {
		while (r < n - 1 && ar[r + 1] - ar[l] <= d) r++; 
		int dist = r - l + 1; //largest tower we can built when ar[l] block is the base
		sol = (sol * 1LL * dist) % MOD;
	}
	cout << sol << '\n';
}

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