이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
int main() {
int n, d;
cin >> n >> d;
int arr[n];
for(int i = 0;i<n;i++) {
cin >> arr[i];
}
sort(arr,arr+n);
int count[n];
long long int ans = 1;
int left = 0;
int right = 0;
while(left <= right) {
while(right < n && arr[right] - arr[left] <=d) {
count[right] = right - left;
right++;
}
left++;
}
for(int i =0;i<n;i++) {
ans = (ans * (count[i]+1)) % (long long int) (10000000009);
}
cout << ans << endl;
return 0;
}
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