#include <bits/stdc++.h>
#include "horses.h"
using namespace std;
using ll = long long;
using pii = pair<int, int>;
const int MOD = 1e9+7;
const ll INF = 1e18;
vector<ll> x;
vector<ll> y;
int n;
ll compute(vector<ll> a, vector<ll> b) {
int idx=0;
ll prod=1;
bool moduled = false;
for (int i=1; i<(int)a.size(); i++) {
ll y0 = b[idx];
ll y1 = b[i];
prod *= x[i];
if (prod >= MOD) {
moduled = true;
prod %= MOD;
}
if (moduled) {
//Se que y[i] <= y[j]*prod
//Conviene j
idx = i;
moduled = 0;
prod = 1;
}
else {
if (prod*y1 >= y0) {
idx = i;
prod = 1;
moduled = false;
}
}
}
prod=a[0];
for (int i=1; i<n; i++) {
if (i > idx) break;
prod *= a[i];
prod %= MOD;
}
return (prod*b[idx]) % MOD;
}
int init(int N, int* a, int* b) {
n = N;
x.assign(n, 0);
y.assign(n, 0);
for (int i=0; i<n; i++) {
x[i] = a[i];
y[i] = b[i];
}
n = N;
vector<ll> xx, yy;
xx.push_back(x[0]);
yy.push_back(y[0]);
for (int i=1; i<n; i++) {
if (x[i] == 1) {
yy.back() = max(yy.back(), (ll)y[i]);
}
else {
xx.push_back(x[i]);
yy.push_back(y[i]);
}
}
return compute(x, y);
}
int updateX(int pos, int val) {
x[pos] = val;
vector<ll> xx, yy;
xx.push_back(x[0]);
yy.push_back(y[0]);
for (int i=1; i<n; i++) {
if (x[i] == 1) {
yy.back() = max(yy.back(), (ll)y[i]);
}
else {
xx.push_back(x[i]);
yy.push_back(y[i]);
}
}
return compute(x, y);
}
int updateY(int pos, int val) {
y[pos] = val;
vector<ll> xx, yy;
xx.push_back(x[0]);
yy.push_back(y[0]);
for (int i=1; i<n; i++) {
if (x[i] == 1) {
yy.back() = max(yy.back(), (ll)y[i]);
}
else {
xx.push_back(x[i]);
yy.push_back(y[i]);
}
}
return compute(x, y);
}
