이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main (){
int n, d;
cin>>n>>d;
vector<int>v(n);
for (int i=0; i<n; i++) cin>>v[i];
sort(v.begin(), v.end());
vector<int>dp(n);
vector<int>b(n);
for (int i=0; i<n; i++){
for (int j=i-1; j>=0; j--){
if (v[i]<=v[j]+d) b[i]++;
else break;
}
}dp[0]=1;
for (int i=1; i<n; i++) dp[i]=(dp[i-1]*(b[i]+1))%1000000009;
cout<<dp[n-1]<<endl;
return 0;
}
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