Problem p02621 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>

typedef long long ll;
typedef long double lld;
using namespace std;

#define endl "\n"
#define fi first
#define se second
#define MEMS(a, b) memset(a, b, sizeof(a))
#define _                                                                      \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL);                                                               \
  cout.tie(NULL);
#define __                                                                     \
  freopen("input.txt", "r", stdin);                                            \
  freopen("output.txt", "w", stdout);
#define all(c) c.begin(), c.end()
#define pii pair<int, int>

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
  uniform_int_distribution<int> uid(l, r);
  return uid(rng);
}

#define tr(...)                                                                \
  cout << __FUNCTION__ << ' ' << __LINE__ << " = ";                            \
  trace(#__VA_ARGS__, __VA_ARGS__)
template <typename S, typename T>
ostream &operator<<(ostream &out, pair<S, T> const &p) {
  out << '(' << p.fi << ", " << p.se << ')';
  return out;
}

template <typename T> ostream &operator<<(ostream &out, vector<T> const &v) {
  ll l = v.size();
  for (ll i = 0; i < l - 1; i++)
    out << v[i] << ' ';
  if (l > 0)
    out << v[l - 1];
  return out;
}

template <typename T> ostream &operator<<(ostream &out, set<T> const &v) {
  for (auto i = v.begin(); i != v.end(); i++)
    out << (*i) << ' ';
  return out;
}
template <typename T> ostream &operator<<(ostream &out, multiset<T> const &v) {
  for (auto i = v.begin(); i != v.end(); i++)
    out << (*i) << ' ';
  return out;
}
template <typename T, typename V>
ostream &operator<<(ostream &out, map<T, V> const &v) {
  for (auto i = v.begin(); i != v.end(); i++)
    out << "\n" << (i->first) << ":" << (i->second);
  return out;
}

template <typename T> void trace(const char *name, T &&arg1) {
  cout << name << " : " << arg1 << endl;
}

template <typename T, typename... Args>
void trace(const char *names, T &&arg1, Args &&...args) {
  const char *comma = strchr(names + 1, ',');
  cout.write(names, comma - names) << " : " << arg1 << " | ";
  trace(comma + 1, args...);
}

#define int ll

int solve() {
  int a;
  cin >> a;
  cout << a + a * a + a * a * a << endl;
}

int32_t main() {
  _ int t;
  // cin >> t;
  t = 1;
  while (t--)
    solve();
  return EXIT_SUCCESS;
}


Fixed submission:
#include <bits/stdc++.h>

typedef long long ll;
typedef long double lld;
using namespace std;

#define endl "\n"
#define fi first
#define se second
#define MEMS(a, b) memset(a, b, sizeof(a))
#define _                                                                      \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL);                                                               \
  cout.tie(NULL);
#define __                                                                     \
  freopen("input.txt", "r", stdin);                                            \
  freopen("output.txt", "w", stdout);
#define all(c) c.begin(), c.end()
#define pii pair<int, int>

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
  uniform_int_distribution<int> uid(l, r);
  return uid(rng);
}

#define tr(...)                                                                \
  cout << __FUNCTION__ << ' ' << __LINE__ << " = ";                            \
  trace(#__VA_ARGS__, __VA_ARGS__)
template <typename S, typename T>
ostream &operator<<(ostream &out, pair<S, T> const &p) {
  out << '(' << p.fi << ", " << p.se << ')';
  return out;
}

template <typename T> ostream &operator<<(ostream &out, vector<T> const &v) {
  ll l = v.size();
  for (ll i = 0; i < l - 1; i++)
    out << v[i] << ' ';
  if (l > 0)
    out << v[l - 1];
  return out;
}

template <typename T> ostream &operator<<(ostream &out, set<T> const &v) {
  for (auto i = v.begin(); i != v.end(); i++)
    out << (*i) << ' ';
  return out;
}
template <typename T> ostream &operator<<(ostream &out, multiset<T> const &v) {
  for (auto i = v.begin(); i != v.end(); i++)
    out << (*i) << ' ';
  return out;
}
template <typename T, typename V>
ostream &operator<<(ostream &out, map<T, V> const &v) {
  for (auto i = v.begin(); i != v.end(); i++)
    out << "\n" << (i->first) << ":" << (i->second);
  return out;
}

template <typename T> void trace(const char *name, T &&arg1) {
  cout << name << " : " << arg1 << endl;
}

template <typename T, typename... Args>
void trace(const char *names, T &&arg1, Args &&...args) {
  const char *comma = strchr(names + 1, ',');
  cout.write(names, comma - names) << " : " << arg1 << " | ";
  trace(comma + 1, args...);
}

#define int ll

int solve() {
  int a;
  cin >> a;
  cout << a + a * a + a * a * a << endl;
  return 0;
}

int32_t main() {
  _ int t;
  // cin >> t;
  t = 1;
  while (t--)
    solve();
  return EXIT_SUCCESS;
}