Submission #899722

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
8997222024-01-06 22:50:19ivazivaA Huge Tower (CEOI10_tower)C++14
90 / 100
774 ms2140 KiB
#include <bits/stdc++.h>
using namespace std;
#define MOD 1000000009
#define MAXN 100010
long long n,d;
long long niz[MAXN];
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++) cin>>niz[i];
sort(niz+1,niz+n+1);
long long ans=1;
for (long long i=2;i<=n;i++)
{
long long j=i-1;
while (j>=1 and niz[i]-niz[j]<=d) j--;
long long br=i-j;
ans*=br; if (ans>=MOD) ans%=MOD;
}
cout<<ans<<endl;
}
 
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