Submission #1228844

#	Time	Username	Problem	Language	Result	Execution time	Memory
1228844		ByeWorld	A Huge Tower (CEOI10_tower)	C++20	0 / 100	184 ms	8764 KiB

tower

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define int long long
#define ll long long
#define se second
#define fi first
#define pb push_back
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,pii> ipii;
const int MAXN = 2e5+10;
const int SQRT = 450;
const int INF = 2e9;
const int MOD = 1e9+7;
const int LOG = 20;
int sum(int a, int b){ return (a+MOD+b)%MOD; }
void chsum(int &a, int b){ a = (a+MOD+b)%MOD; }
int mul(int a, int b){ return (a*b)%MOD; }
void chmul(int &a, int b){ a = (a*b)%MOD; }
void chmn(auto &a, auto b){ a = min(a, b); }
void chmx(auto &a, auto b){ a = max(a, b); }

int n, d;
int ans = 1;

signed main(){
	// ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n>>d;
	vector<int> vec;
	for(int i=1; i<=n; i++){
		int x; cin>>x; vec.pb(x);
	}
	sort(vec.begin(), vec.end());
	int las = 0;
	for(int i=0; i<vec.size(); i++){
		while(las+1<vec.size() && vec[las+1]-vec[i] < d) las++;
		chmul(ans, las-i+1);
	}
	cout << ans << '\n';
}

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