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>
using namespace std;
#define int long long
const int mod=1000000007;
int f(int wossz, int hossz){
return (((((hossz*(hossz+1)/2)%mod) * wossz)%mod)*(wossz+1)/2)%mod;
}
int32_t main() {
// all hi are equal --> téglalap
int s;
cin>>s;
int h[s];
int w[s];
int wossz = 0;
bool teglalap = true;
for (int i=0; i<s; i++){
cin >> h[i];
if (h[i] != h[0]) teglalap = false;
}
int hossz = h[0];
for(int i=0; i<s; i++){
cin>>w[i];
wossz = (w[i] + wossz) % mod;
}
if (teglalap) cout << f(wossz, hossz);
//cout << (((((hossz*(hossz+1)/2)%mod) * wossz)%mod)*(wossz+1)/2)%mod<<"\n";
// --------------- lépcső -----------------
/*int ans = f(wossz, h[0]);
wossz -= w[0];
for (int i=1; i<s; i++){
ans += f(wossz, h[i]);
ans -= f(wossz, h[i-1]);
wossz -= w[i];
}
cout << ans;*/
return 0;
}
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