제출 #527165

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
527165		beepbeepsheep	Calvinball championship (CEOI15_teams)	C++17	0 / 100	270 ms	512 KiB

teams

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ii pair<ll,ll>
#define endl '\n'
const ll inf=1e15;
const ll mod=1e9+7;
const ll maxn=10005;
ll arr[maxn];
ll nxt[maxn];
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n;
    cin>>n;
    arr[1]=1;
    for (int i=1;i<=n-1;i++){
        for (int j=1;j<=i;j++){
            nxt[j]+=arr[j]*j;
            nxt[j+1]+=arr[j];
            nxt[j]%=mod;
            nxt[j+1]%=mod;
        }
        swap(arr,nxt);
        memset(nxt,0,sizeof(nxt));
    }
    ll ans=0;
    for (int i=1;i<=n;i++){
        ans+=arr[i];
        ans%=mod;
    }
    cout<<ans;
    return 0;
}

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