Submission #791348

#	Time	Username	Problem	Language	Result	Execution time	Memory
791348		ttamx	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	4 ms	352 KiB

fancyfence

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N=1e5+5;
const ll mod=1e9+7;
const ll inv2=5e8+4;

int n;
ll h[N],w[N];
ll ans;

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n;
    for(int i=1;i<=n;i++)cin >> h[i];
    for(int i=1;i<=n;i++)cin >> w[i];
    for(int i=1;i<=n;i++){
        ll rmq=h[i];
        ans+=h[i]*w[i];
        ans%=mod;
        for(int j=i;j>=1;j--){
            rmq=min(rmq,h[j]);
            ans+=rmq*rmq*w[i]%mod*w[j]%mod;
            ans%=mod;
        }
    }
    cout << ans*inv2%mod;
}

• Subtask 1: 0 / 0
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 18
• Subtask 7: 0 / 27