#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MAXN = 3e5+10;
const int INF = 0x3f3f3f3f;
const ll LINF = 1e15;
const ll MOD = 1e9+9;
inline mult(int a, int b){ return (1ll*a*b)%MOD; }
inline sum(int a, int b){ return (a+b)%MOD; }
void solve(){
int n, d; cin >> n >> d;
vector<int> arr(n);
for(int i=0;i<n;i++)
cin >> arr[i];
sort(all(arr));
vector<int> opt(n);
int low=0;
for(int i=0;i<n;i++){
while(low<n && arr[low]+d<arr[i])
low++;
opt[i]=i-low;
}
int ans=1;
for(int i=0;i<n;i++)
ans=mult(ans, opt[i]+1);
cout << ans << "\n";
}
int main(){
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
// freopen("truth.in", "r", stdin);
// freopen("truth.out", "w", stdout);
int tt=1;
// cin >> tt;
while(tt--)
solve();
return 0;
}
Compilation message
tower.cpp:22:8: error: ISO C++ forbids declaration of 'mult' with no type [-fpermissive]
22 | inline mult(int a, int b){ return (1ll*a*b)%MOD; }
| ^~~~
tower.cpp:23:8: error: ISO C++ forbids declaration of 'sum' with no type [-fpermissive]
23 | inline sum(int a, int b){ return (a+b)%MOD; }
| ^~~
