Submission #405209

#	Time	Username	Problem	Language	Result	Execution time	Memory
405209		varungoyalbits	Fancy Fence (CEOI20_fancyfence)	C++17	30 / 100	1088 ms	1988 KiB

fancyfence

/*
Problem Link:https://oj.uz/problem/view/CEOI20_fancyfence
Author: varungoyalbits
*/
#include <bits/stdc++.h>
using namespace std;
long long sumTillN(const long long N,const long long mod)
{
    return ((N*(N+1))/2)%mod;
}
long long subTask6()
{
    int n;
    cin>>n;
    vector<long long>h(n);
    vector<long long>w(n);
    long long mod=1e9+7;
    for(int i=0;i<n;i++)
    {
        cin>>h[i];
    }
    for(int i=0;i<n;i++)
    {
        cin>>w[i];
    }
    long long ans=0;
    for(int i=0;i<n;i++)
    {
        long long val=sumTillN(h[i],mod);
        val=(val*sumTillN(w[i],mod))%mod;
        ans=(ans+val)%mod;
        long long mn=h[i];
        for(int j=i-1;j>=0;j--)
        {
            mn=min(mn,h[j]);
            val=sumTillN(mn,mod);
            val=(val*((w[i]*w[j])%mod))%mod;
            ans=(ans+val)%mod;
        }
    }
    return ans;
}
int main()
{
    cout<<subTask6()<<"\n";
    return 0;
}

• 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