Submission #1247458

#	Time	Username	Problem	Language	Result	Execution time	Memory
1247458		AHOKA	Asceticism (JOI18_asceticism)	C++20	49 / 100	27 ms	47172 KiB

asceticism

#include <bits/stdc++.h>

#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

using namespace std;
 
#define threesum cin.tie(NULL); cout.tie(NULL); ios_base::sync_with_stdio(false)
#define all(a) a.begin(), a.end()
#define F first
#define S second
#define int long long
#define pii pair<int, int>
#define ppp pair<int, pii>
#define dout cout << fixed << setprecision(15)
#define mid ((l + r) >> 1)
#define lc (id << 1)
#define rc (lc + 1)

mt19937 rng(chrono::steady_clock().now().time_since_epoch().count());

const int maxn = 1e6 + 10, maxm = 3e3 + 10, oo = 1e18 + 10, lg = 23, sq = 30, mod = 1e9 + 7;

int n, k;

int dp[maxm][maxm];

void solve(){
    cin >> n >> k;
    dp[1][1] = 1;
    for (int i = 2; i <= n;i++)
        for (int j = 1; j <= i;j++)
            dp[i][j] = (dp[i - 1][j] * j + dp[i - 1][j - 1] * (i + 1 - j)) % mod;
    cout << dp[n][k];
}

signed main()
{
    threesum;

    int t = 1;
    //cin >> t;
    while(t--)
        solve();
}

• Subtask 1: 4 / 4
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 0 / 51