Submission #433499

#	Time	Username	Problem	Language	Result	Execution time	Memory
433499		joshualiu555	A Huge Tower (CEOI10_tower)	C++14	30 / 100	30 ms	1996 KiB

tower

#include <fstream>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <numeric>
#include <vector>
#include <set>
#include <map>
#include <cmath>
#include <cstring>
#include <climits>

using namespace std;

using ll = long long;
const int INF = 2e5 + 5;
const int MOD = 1e9 + 7;

int n, d, x[INF];

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);

    //ifstream fin(".in");
    //ofstream fout(".out");

    cin >> n >> d;
    for (int i = 0; i < n; i++) cin >> x[i];
    sort(x, x + n);

    ll ans = 1;
    int j = 0;
    for (int i = 0; i < n; i++) {
        while (x[j + 1] - x[i] <= d && j < n - 1) j++;
        ll distance = j - i + 1;
        ans *= 1ll * distance % MOD;
    }

    cout << ans % MOD;

    return 0;
}

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