#include <bits/stdc++.h>
#define ll long long
using namespace std;
const ll MOD = 1000000007;
const ll DIV_6 = 686070594; // binpow(6, MOD-2);
int draw_territory(int N, int a, int b, vector<int> D, vector<int> L) {
const ll A = a, B = b;
const ll len = L[0]+1;
const ll cnt = (len*(len+1)/2)%MOD;
const ll sum_of_powers = len*(len+1)%MOD * (2*len+1)%MOD * DIV_6%MOD;
return ( (A*cnt)%MOD + (B*(sum_of_powers - cnt+MOD)%MOD)%MOD )%MOD;
}
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