#include <iostream>
#include <cstdio>
#include <vector>
#include <utility>
#include <cmath>
#include <climits>
#include <algorithm>
#include <array>
#include <set>
#include <map>
using namespace std;
#define input "tower.in"
#define output "tower.out"
#define int long long
#define MOD (int)(1e9+9)
int n, k;
vector<int> a;
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0);
//freopen(input, "r", stdin);
//freopen(output, "w", stdout);
cin >> n >> k;
a.reserve(n+1);
for (int i=0;i<n;i++) {
int x; cin >> x;
a.push_back(x);
}
a.push_back(LLONG_MAX);
sort(a.begin(), a.end());
int ans=1,r=1,l=0;
while (r<=n) {
//cout << "l r " << l << ' ' << r << endl;
int blocks = r-l;//when this is the base and all the previous ones have been used, this is the size to build
if (a[l]+k>a[r]) r++;
else if (a[l]+k<=a[r]) {
ans*=blocks;
l++;
if (r==l) r++;
}
}
cout << ans%MOD << endl;
Compilation message
tower.cpp: In function 'int main()':
tower.cpp:42:28: error: expected '}' at end of input
42 | cout << ans%MOD << endl;
| ^
tower.cpp:19:15: note: to match this '{'
19 | signed main() {
| ^
