Problem p02658 (C++) — buggy submission, verdict: Runtime Error

#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using Pi = pair<int, int>;
using Pl = pair<ll, ll>;
using vint = vector<int>;
using vvint = vector<vint>;
using vvvint = vector<vvint>;
using vdouble = vector<double>;
using vvdouble = vector<vdouble>;
using vvvdouble = vector<vvdouble>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using uint = unsigned int;
using ull = unsigned long long;

template <typename T> using uset = unordered_set<T>;
template <typename T1, typename T2> using umap = unordered_map<T1, T2>;

constexpr int INF = (1 << 30) - 1;
constexpr ll LLINF = 1LL << 60;
constexpr int dy[] = {1, 0, -1, 0, 1, -1, -1, 1};
constexpr int dx[] = {0, 1, 0, -1, 1, 1, -1, -1};
constexpr char el = '\\n';
constexpr int mod = 1000000007;
constexpr int mod2 = 998244353;
template <typename T> T gcd(T a, T b) { return (b ? gcd(b, a % b) : a); }
template <typename T> T lcm(T a, T b) { return (a / gcd(a, b) * b); }
template <typename T1, typename T2> inline bool chmin(T1 &a, T2 b) {
  return (a > b && (a = b, true));
}
template <typename T1, typename T2> inline bool chmax(T1 &a, T2 b) {
  return (a < b && (a = b, true));
}
template <typename T> bool isin(T y, T x, T h, T w) {
  return (0 <= y && 0 <= x && y < h && x < w);
}
template <typename T> bool isin1(T y, T x, T h, T w) {
  return (0 < y && 0 < x && y <= h && x <= w);
}

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

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

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

void Main() {
  ll N;
  cin >> N;
  ll prd = 1;
  ll dekai = 1e18;
  bool flag = false;
  for (int i = 0; i < N; i++) {
    ll A;
    cin >> A;
    if (A == 0)
      prd = 0;
    if (prd == 0)
      continue;
    if (flag)
      continue;
    if (A > dekai / prd) {
      flag = true;
    }
    if (flag)
      continue;
    prd *= A;
  }
  if (!prd) {
    cout << 0 << endl;
  } else if (flag || prd > dekai) {
    cout << -1 << endl;
  } else {
    cout << prd << endl;
  }
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(0);
  cout << fixed << setprecision(20);
  Main();
  return (0);
}


Error: 0

Fixed submission:

#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using Pi = pair<int, int>;
using Pl = pair<ll, ll>;
using vint = vector<int>;
using vvint = vector<vint>;
using vvvint = vector<vvint>;
using vdouble = vector<double>;
using vvdouble = vector<vdouble>;
using vvvdouble = vector<vvdouble>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using uint = unsigned int;
using ull = unsigned long long;

template <typename T> using uset = unordered_set<T>;
template <typename T1, typename T2> using umap = unordered_map<T1, T2>;

constexpr int INF = (1 << 30) - 1;
constexpr ll LLINF = 1LL << 60;
constexpr int dy[] = {1, 0, -1, 0, 1, -1, -1, 1};
constexpr int dx[] = {0, 1, 0, -1, 1, 1, -1, -1};
constexpr char el = '\\n';
constexpr int mod = 1000000007;
constexpr int mod2 = 998244353;
template <typename T> T gcd(T a, T b) { return (b ? gcd(b, a % b) : a); }
template <typename T> T lcm(T a, T b) { return (a / gcd(a, b) * b); }
template <typename T1, typename T2> inline bool chmin(T1 &a, T2 b) {
  return (a > b && (a = b, true));
}
template <typename T1, typename T2> inline bool chmax(T1 &a, T2 b) {
  return (a < b && (a = b, true));
}
template <typename T> bool isin(T y, T x, T h, T w) {
  return (0 <= y && 0 <= x && y < h && x < w);
}
template <typename T> bool isin1(T y, T x, T h, T w) {
  return (0 < y && 0 < x && y <= h && x <= w);
}

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

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

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

void Main() {
  ll N;
  cin >> N;
  ll prd = 1;
  ll dekai = 1e18;
  bool flag = false;
  bool zr = false;
  for (int i = 0; i < N; i++) {
    ll A;
    cin >> A;
    if (A > dekai / prd) {
      flag = true;
    }
    if (A == 0)
      zr = true;
    prd *= A;
  }
  if (zr) {
    cout << 0 << endl;
  } else if (flag || prd > dekai) {
    cout << -1 << endl;
  } else {
    cout << prd << endl;
  }
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(0);
  cout << fixed << setprecision(20);
  Main();
  return (0);
}