Submission #1326568

#	Time	Username	Problem	Language	Result	Execution time	Memory
1326568		jim_x	A Huge Tower (CEOI10_tower)	C++17	Evaluating	0 ms	0 KiB

tower

#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <cmath>
#include <numeric>
#include <queue>
#include <stack>
#include <iomanip>
#include <array>
#include <functional>
#include <bitset>
using namespace std;

void baseIO(string s = ""){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if (s.size()){
        freopen((s + ".in").c_str(), "r", stdin);
        freopen((s + ".out").c_str(), "w", stdout);
    }
}


int mod = 1e9 + 9;

int main() {
    baseIO();

    int n, d;
    cin >> n >> d;

    vector<int> a(n);
    for (int i = 0; i < n; i++) cin >> a[i];

    sort(a.begin(), a.end());

    long long ans = 1;
    for (int i = 1; i < n; i++){
        int ok = 1 + i - (lower_bound(a.begin(), a.begin() + i, a[i] - d) - a.begin());
        ans = (ans * ok) % mod;
    }
    
    cout << ans << endl;

    return 0;
}

Compilation message (stderr)

tower.cpp: In function 'void baseIO(std::string)':
tower.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen((s + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tower.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen((s + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~