Submission #1085480

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085480		steveonalex	A Huge Tower (CEOI10_tower)	C++17	80 / 100	220 ms	262144 KiB

tower

// #include "rect.h"
#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
#define block_of_code if(true)
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double cur = rngesus(0, MASK(60) - 1);
    cur /= MASK(60) - 1;
    return l + cur * (r - l);
}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }


 
const int MOD = 1e9 + 9;
struct Modular{
    ll x;
    Modular(ll _x = 0){x = _x;}
    Modular& operator += (Modular y){
        x += y.x;
        if (x >= MOD) x -= MOD;
        return *this;
    }
    Modular operator + (Modular y) {
        Modular tmp = *this;
        return tmp += y;
    }
 
    Modular& operator -= (Modular y){
        x -= y.x;
        if (x < 0) x += MOD;
        return *this;
    }
    Modular operator - (Modular y) {
        Modular tmp = *this;
        return tmp -= y;
    }
 
    Modular& operator *= (Modular y){
        x *= y.x;
        if (x >= MOD) x %= MOD;
        return *this;
    }
    Modular operator * (Modular y) {
        Modular tmp = *this;
        return tmp *= y;
    }
 
    // use at your own risk
    bool operator == (Modular y){
        return x == y.x;
    }
    bool operator != (Modular y){
        return x != y.x;
    }
};
ostream& operator << (ostream& out, Modular x){
    out << x.x;
    return out;
}

int main(void){
    ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
    clock_t start = clock();

    int n, d; cin >> n >> d;
    vector<int> a(n+1, -1e9 - 69);
    for(int i = 1; i<=n; ++i) cin >> a[i];
    sort(ALL(a));
    
    vector<int> cnt(n+1);
    for(int i= 1; i<=n; ++i){
        cnt[i] = lower_bound(ALL(a), a[i] - d) - a.begin() - 1;
    }

    Modular dp[n+1][n+1];
    dp[0][0] = 1;
    for(int i = 0; i<n; ++i){
        for(int j = 0; j <= cnt[i]; ++j) if (dp[i][j] != 0){
            dp[i+1][j] += dp[i][j];
            if (j + 1 <= cnt[i+1]){
                dp[i+1][j+1] += dp[i][j] * (cnt[i+1] - j);
            }
        }
    }

    vector<Modular> fact(n+1);
    fact[0] = 1;
    for(int i = 1; i<=n; ++i) fact[i] = fact[i-1] * i;

    Modular ans = 0;
    for(int i = 0; i<n; ++i){
        if (i % 2 == 0) ans += dp[n][i] * fact[n - i];
        else ans -= dp[n][i] * fact[n - i];
    }
    cout << ans << "\n";


    cerr << "Time elapsed: " << clock() - start << " ms\n";
    return 0;
}

• Subtask 1: 5 / 5
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