제출 #628774

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
628774		Iwanttobreakfree	Fancy Fence (CEOI20_fancyfence)	C++17	0 / 100	5 ms	324 KiB

fancyfence

#include <iostream>
#include <vector>
#include <map>
#include <stack>
using namespace std;
const int mod=1e9+7;
#define int long long
signed main(){
    int n;
    cin>>n;
    vector<int> v(n),h(n),pre(n+1);
    map<int,int> mp;
    for(int& i:h)cin>>i;
    for(int& i:v)cin>>i;
    for(int i=0;i<n;i++)pre[i+1]=pre[i]+v[i];
    long long ans=0;
    for(int i=0;i<n;i++){
        ans+=(((v[i]*(v[i]+1)/2)%mod)*(h[i]*(h[i]+1)/2)%mod)%mod;
        ans%=mod;
        int he=h[i];
        for(int j=i+1;j<n;j++){
            he=min(he,h[j]);
            ans+=(((pre[j+1]-pre[i+1])%mod)*(he*(he+1)/2)%mod)%mod;
            ans%=mod;
            //cout<<ans<<' ';
        }
        //cout<<ans<<'\n';
    }
    cout<<ans;
}

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