Submission #1109027

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109027		Ak_16	Fancy Fence (CEOI20_fancyfence)	C++17	30 / 100	1094 ms	4432 KiB

fancyfence

#include <iostream>
using namespace std;
#define int long long

signed main() 
{
    int n; int h[200005]; int w[200005];
    cin>>n;
    for(int i=1; i<=n; i++){cin>>h[i];}
    for(int i=1; i<=n; i++){cin>>w[i];}
    
    int ans=0; int p=1e9+7;
    for(int i=1; i<=n; i++){
      ans += (w[i] * (w[i]+1) / 2 % p) % p * (h[i] * (h[i]+1) / 2 % p) % p; ans %= p; 
    }
    for(int i=1; i<n; i++){
      int mn=h[i];
      for(int j=i+1; j<=n; j++){
        mn=min(mn, h[j]);
        ans += w[i] * w[j] % p * (mn * (mn+1) / 2 % p) % p; ans %= p;
      }
    }
    cout<<ans;
}

• 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