Submission #347406

#	Time	Username	Problem	Language	Result	Execution time	Memory
347406		danielsuh	A Huge Tower (CEOI10_tower)	C++17	100 / 100	140 ms	16124 KiB

tower

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

#define mpa make_pair
#define pb push_back
#define ins insert
#define f first
#define s second
#define all(x) x.begin(), x.end()
#define nl "\n"
#define int ll

const int inf = numeric_limits<int>::max();

void fileIO(string filename) {
	freopen((filename + ".in").c_str(), "r", stdin);
	freopen((filename + ".out").c_str(), "w", stdout);
}

const ll MOD = 1e9 + 9;

void solve() {
	int n, d;
	cin >> n >> d;
	vector<int> a(n, 0);
	for(int i = 0; i < n; i++) {
		cin >> a[i];
	}
	sort(all(a), greater<>());
	vector<int> mult(n, 1);
	int r = 0;
	for(int l = 0; l < n; l++) {
		while(r < n && a[l] - a[r] <= d) {
			r++;
		}
		mult[l] = r - l;
	}
	int ans = 1;
	for(int i = n - 1; i >= 0; i--) {
		ans *= mult[i] % MOD;
		ans %= MOD;
	}
	cout << ans % MOD;
}

signed main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);
	//fileIO("");
	
	int tc = 1;
	//cin >> tc;

	for(int i = 1; i <= tc; i++) {
		solve();
	}
}

Compilation message (stderr)

tower.cpp: In function 'void fileIO(std::string)':
tower.cpp:20:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   20 |  freopen((filename + ".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tower.cpp:21:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   21 |  freopen((filename + ".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
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