제출 #477495

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
477495		niloyroot	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	1 ms	204 KiB

fancyfence

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define forp(i,a,b) for(ll i=a;i<=b;i++)
#define newl '\n'
const ll mod=1000000007;

void solve(){
    ll n; cin>>n;
    ll sum=0,h,c;
    forp(i,1,n){cin>>h;}
    forp(i,1,n){cin>>c; sum+=c;}
    ll ans=(h*(h+1)*sum*(sum+1))/4; ans%=mod;
    cout<<ans<<newl;
}
 
int main() {
    ios_base::sync_with_stdio(false); 
    cin.tie(NULL);
    solve();
}

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