Submission #312096

#	Time	Username	Problem	Language	Result	Execution time	Memory
312096		Kripton	Asceticism (JOI18_asceticism)	C++14	49 / 100	53 ms	24952 KiB

asceticism

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
const int MOD=1e9+7;
int dp[3005][3005];
int main()
{
#ifdef HOME
    freopen("test.in","r",stdin);
    freopen("test.out","w",stdout);
#endif // HOME
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
    int n,k,i,j;
    cin>>n>>k;
    dp[0][0]=1;
    for(i=0; i<=n; i++)
        for(j=0; j<=k; j++)
        {
            dp[i+1][j]=(dp[i+1][j]+1LL*j*dp[i][j])%MOD;
            dp[i+1][j+1]=(dp[i+1][j+1]+1LL*(i+1-j)*dp[i][j])%MOD;
        }
    cout<<dp[n][k];
    return 0;
}

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