제출 #1104658

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1104658		ezzzay	Calvinball championship (CEOI15_teams)	C++14	0 / 100	3 ms	2640 KiB

teams

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define pb push_back
const int N=3e5+5;
const int mod=1e9+7;
int a[N];
int po[N];
signed main(){
    int n;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    po[n+1]=1;
    int p=0;
    for(int i=n;i>=1;i--){
        po[i]=po[i+1]*i%mod;
    }
    
    for(int i=1;i<=n;i++){
        p+= (a[i]-1)*po[i+1];
        p%=mod;
    }
    cout<<p;
}

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