Submission #899725

#	Time	Username	Problem	Language	Result	Execution time	Memory
899725		ivaziva	A Huge Tower (CEOI10_tower)	C++14	0 / 100	1008 ms	9564 KiB

tower

#include <bits/stdc++.h>

using namespace std;

#define MOD 1000000009
#define MAXN 100010

long long n,d;
vector<long long> niz;

int main()
{
    ios_base::sync_with_stdio(false);
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>d;
    for (long long i=1;i<=n;i++)
    {
        long long x; cin>>x;
        niz.push_back(x);
    }
    sort(niz.begin(),niz.end());
    long long ans=1;
    for (long long i=1;i<n;i++)
    {
        long long j=i;
        while (j<n-1 and niz[j]-niz[i]<=d) j++;
        long long br=j-i+1;
        ans*=br; if (ans>=MOD) ans%=MOD;
    }
    cout<<ans<<endl;
}

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