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