Submission #963032

#	Time	Username	Problem	Language	Result	Execution time	Memory
963032		anton	Fancy Fence (CEOI20_fancyfence)	C++17	30 / 100	1090 ms	2396 KiB

fancyfence

#include<bits/stdc++.h>

using namespace std;
#define int long long
#define pii pair<int,int>

const int MAX_N = 1e5;
const int mod =1e9+7;

int h[MAX_N];
int w[MAX_N];

int nbp(int u){
    return (u*(u+1LL)/2LL)%mod;
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n; 
    cin>>n;
    for(int i = 0; i<n; i++){
        cin>>h[i];
    }
    for(int i = 0; i<n; i++){
        cin>>w[i];
    }

    int res= 0;
    
    for(int l = 0; l<n; l++){
        int minh= h[l];
        for(int r = l; r<n; r++){
            minh= min(minh, h[r]);
            if(r!=l){
                res = (res+((nbp(minh) * w[l])%mod)*w[r])%mod;
            }
            else{
                res=(res+ (nbp(minh) * nbp(w[l]))%mod)%mod;
            }
        }
    }

    cout<<res<<endl;
}

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