Submission #486399

#	Time	Username	Problem	Language	Result	Execution time	Memory
486399		Rainbowbunny	A Huge Tower (CEOI10_tower)	C++17	100 / 100	112 ms	8772 KiB

tower

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

const int mod = 1e9 + 9;

int Mul(int x, int y)
{
    return 1ll * x * y % mod;
}

int n, d;
vector <int> Arr;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> d;
    Arr.resize(n);
    for(auto &x : Arr)
    {
        cin >> x;
    }
    sort(Arr.begin(), Arr.end());
    int pt = 0, ans = 1;
    for(int i = 0; i < Arr.size(); i++)
    {
        while(pt + 1 < (int)Arr.size() and Arr[pt + 1] <= Arr[i] + d)
        {
            pt++;
        }
        ans = Mul(ans, pt - i + 1);
    }
    cout << ans << '\n';
}

Compilation message (stderr)

tower.cpp: In function 'int main()':
tower.cpp:27:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i = 0; i < Arr.size(); i++)
      |                    ~~^~~~~~~~~~~~

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