제출 #395022

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
395022		Pichon5	Fancy Fence (CEOI20_fancyfence)	C++17	30 / 100	1092 ms	2000 KiB

fancyfence

#include<bits/stdc++.h>
#define lcm(a,b) (a/__gcd(a,b))*b
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long int
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define F first
#define S second
#define mp make_pair
//salida rapida "\n"
//DECIMALES fixed<<sp(n)<<x<<endl;
//gcd(a,b)= ax + by
//lCB x&-x
//set.erase(it) - ersases the element present at the required index//auto it = s.find(element)
//set.find(element) - iterator pointing to the given element if it is present else return pointer pointing to set.end()
//set.lower_bound(element) - iterator pointing to element greater than or equal to the given element
//set.upper_bound(element) - iterator pointing to element greater than the given element
// | ^
//__builtin_popcount(x)
using namespace std;
const ll MOD=1e9+7;
vll h,w;
ll bin(ll x){
    x%=MOD;
    return ((x*(x+1))/2)%MOD;
}
ll T(ll x,ll y){
    return (bin(x)%MOD*bin(y)%MOD)%MOD;
}
int main()
{

    //freopen("input1.txt","r",stdin);
    ll n,x;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>x;
        h.pb(x);
    }
    for(int i=0;i<n;i++){
        cin>>x;
        w.pb(x);
    }
    ll res=0;
    for(int i=0;i<n;i++){
        ll Hmin=h[i];
        res=(res+T(h[i],w[i]))%MOD;
        for(int l=i+1;l<n;l++){
            Hmin=min(Hmin,h[l]);
            res=(res+T(Hmin,w[i]+w[l]))%MOD;
            res=(res-T(Hmin,w[i]))%MOD;
            res=(res-T(Hmin,w[l]))%MOD;
        }
    }
    cout<<(res+MOD)%MOD<<endl;


    return 0;
}

//freopen("input.txt","r",stdin);
//756135655

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