제출 #944895

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
944895		Xiaoyang	Fancy Fence (CEOI20_fancyfence)	C++17	15 / 100	17 ms	3948 KiB

fancyfence

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
typedef long long ll;
 
#define fi first 
#define se second 
#define pll pair<ll,ll>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl;
#define MP make_pair
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define SZ(x) (ll)x.size()
#define ALL(x) x.begin(),x.end()
#define endl "\n"
const ll inf=1e18;
ll lowbit(ll x){return x&(-x);}

const ll mod=1e9+7;
const ll maxn=1e5+5;

ll h[maxn],w[maxn];


int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	ll n;cin>>n;
	ll wid=0,ht=0;
	rep(i,1,n+1){
		cin>>h[i];
		ht=h[i];
	}
	rep(i,1,n+1){
		cin>>w[i];
		wid+=w[i];
		wid%=mod;
	}
	
	ll aa=(ht*(ht+1)/2)%mod;
	ll bb=(wid*(wid+1)/2)%mod;
	cout<<aa*bb%mod;
	
	return 0;
}

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