Language: C++

#include<bits/stdc++.h>
using namespace std;
/*******  All Required define Pre-Processors and typedef Constants *******/
#define rep(i,n) for(int i=0; i<(n); ++i)
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.rbegin(), cont.rend()
#define Dcout(a) cout << setprecision(20) << a << endl
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define eb emplace_back
#define vi vector<int>
#define vll vector<ll>
#define vpi vector<pii>
#define vpll vector<pll>
#define fi first
#define se second
using Graph = vector<vector<ll>>;
// const ll INF = (1LL << 60);
const double pi=acos(-1.0);
/******************* debug ********************/
#define debug(var)  do{std::cout << #var << " : ";view(var);}while(0)
#define deb cout << "line : " << __LINE__ << " debug" << endl
template<typename T> void view(T e){cout << e << endl;}
template<typename T> void view(const vector<T>& v){
    for(const auto& e : v) cout << e << " ";
    cout << endl;}
template<typename T> void view(const vector<vector<T> >& vv){
    for(const auto& v : vv){ view(v); }}
/****** Template of some basic operations *****/
struct IoSetup {
    IoSetup() {
        cin.tie(nullptr);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(10);
        cerr << fixed << setprecision(10);
        }
} iosetup;


template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 >& p) {
    os << p.first << " " << p.second;
    return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
    is >> p.first >> p.second;
    return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
    for(int i = 0; i < (int) v.size(); i++) {
        os << v[i] << (i + 1 != v.size() ? " " : "");
    }
    return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
    for(T &in : v) is >> in;
    return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = ll >
vector< T > make_v(size_t a) {
    return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
    return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
    t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
    for(auto &e : t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
    FixPoint(F &&f) : F(forward< F >(f)) {}

    template< typename... Args >
    decltype(auto) operator()(Args &&... args) const {
        return F::operator()(*this, forward< Args >(args)...);
    }
};

template< typename F >
inline decltype(auto) MFP(F &&f) {
    return FixPoint< F >{forward< F >(f)};
}
/*******************************************************/
/******************** Start coding ! *******************/
constexpr int mod = 1000000007;
class mint {
public:
    long long x;
    constexpr mint(long long x=0) : x((x%mod+mod)%mod) {}
    constexpr mint operator-() const { 
      return mint(-x);
    }
    constexpr mint& operator+=(const mint& a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }
    constexpr mint& operator-=(const mint& a) {
        if ((x += mod-a.x) >= mod) x -= mod;
        return *this;
    }
    constexpr mint& operator*=(const mint& a) {
        (x *= a.x) %= mod;
        return *this;
    }
    constexpr mint operator+(const mint& a) const {
        mint res(*this);
        return res+=a;
    }
    constexpr mint operator-(const mint& a) const {
        mint res(*this);
        return res-=a;
    }
    constexpr mint operator*(const mint& a) const {
        mint res(*this);
        return res*=a;
    }
    constexpr mint pow(long long t) const {
        if (!t) return 1;
        mint a = pow(t>>1);
        a *= a;
        if (t&1) a *= *this;
        return a;
    }

    // for prime mod
    constexpr mint inv() const {
        return pow(mod-2);
    }
    constexpr mint& operator/=(const mint& a) {
        return (*this) *= a.inv();
    }
    constexpr mint operator/(const mint& a) const {
        mint res(*this);
        return res/=a;
    }
};
ostream& operator<<(ostream& os, const mint& m){
    os << m.x;
    return os;
}

int main(){
    int n; cin >> n;
    vector<ll> t(n),a(n),h(n,-1);
    rep(i,n) cin >> t[i];
    rep(i,n) cin >> a[i];

    if(t[n-1]!=a[0]){
        cout << 0 << endl;
        return 0;
    }

    //決定できる高さを書き込む
    h[0] = t[0];
    h[n-1] = a[n-1];

    for(int i=1; i<n; ++i){
        //前よりも高くなる時は決定できる
        if(t[i-1]<t[i]){
            //この時にすでに書き込まれている場合は矛盾
            if(h[i]>=0 && h[i]!=t[i]){
                cout << 0 << endl;
                return 0;
            }
            h[i] = t[i];
        }
    }

    //上と同様に右からもする
    for(int i=n-2; i>=0; --i){
        if(a[i]>a[i+1]){
            if(h[i]>=0 && h[i]!=a[i]){
                cout << 0 << endl;
                return 0;
            }
            h[i] = a[i];
        }
    }

    mint ans = 1;
    rep(i,n){
        //何でもいい時には小さい方の全通りが試せる
        if(h[i]==-1){
            ans *= min(t[i],a[i]);
        //この判定が難しい↓
        //実際の値がある場合はそのチェックもする。
        // }else if(h[i]>min(t[i],a[i])){
        //     cout << 0 << endl;
        //     return 0;
        // }
    }

    cout << ans << endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:220:2: error: expected '}' at end of input
  220 | }
      |  ^
a.cc:168:11: note: to match this '{'
  168 | int main(){
      |           ^