This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define int long long
#define matsuri pair<int,int>
#define iris 1000000007
using namespace std;
int H[100010],W[100010];
matsuri st[100010];
int p;
int qwq(int a)
{
int b,res;
b=iris-2;
res=1;
while(b)
{
if(b&1)
res=res*a%iris;
a=a*a%iris;
b>>=1;
}
return res;
}
int cal(int h,int w)
{
int ans,ouo;
h%=iris;
w%=iris;
ans=(w*(w-1+iris)%iris*h%iris*(h-1+iris)%iris)%iris;
ans=ans*qwq(4)%iris;
ouo=(w*(w-1)%iris*h%iris+h*(h-1)%iris*w)%iris;
ouo=ouo*qwq(2)%iris;
ans=(ans+ouo+h*w)%iris;
return ans;
}
int ccc(int h,int w1,int w2)
{
h%=iris;
w1%=iris;
w2%=iris;
int sum1,sum2;
sum1=w1*w2%iris*h%iris;
sum2=h*w1%iris*h%iris*w2%iris;
sum1=((sum2-sum1+iris)%iris*qwq(2)%iris+sum1)%iris;
// cout<<h<<' '<<w1<<' '<<w2<<' '<<sum1<<'\n';
return sum1;
}
int stacksum;
void pop()
{
int h,w,aoi;
h=st[p-1].first;
w=st[p-1].second;
aoi=(h+1)*h/2%iris*w%iris;
stacksum=(stacksum-aoi+iris)%iris;
p--;
}
signed main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int n,h,i,w,ans=0;
cin>>n;
w=0;
for(i=0;i<n;i++)
{
cin>>H[i];
}
for(i=0;i<n;i++)
{
cin>>W[i];
}
for(i=0;i<n;i++)
{
h=H[i];
w=W[i];
int ww=w;
ans+=cal(h,w);
ans%=iris;
while(p && st[p-1].first>=h)
{
w+=st[p-1].second;
ans+=ccc(h,st[p-1].second,ww);
ans%=iris;
pop();
}
ans+=stacksum*ww%iris;
ans%=iris;
h%=iris;
w%=iris;
st[p++]={h,w};
stacksum+=(h+1)*h/2%iris*w%iris;
stacksum%=iris;
}
cout<<ans<<'\n';
return 0;
}
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