Problem p03008 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
#define int long long
#define lint long long
#define pii pair<int, int>
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(c) (c).begin(), (c).end()
#define ZERO(a) memset(a, 0, sizeof(a))
#define MINUS(a) memset(a, 0xff, sizeof(a))
#define MINF(a) memset(a, 0x3f, sizeof(a))
#define POW(n) (1LL << (n))
#define IN(i, a, b) (a <= i && i <= b)
using namespace std;
template <typename T> inline bool CHMIN(T &a, T b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
template <typename T> inline bool CHMAX(T &a, T b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <typename T> inline void SORT(T &a) { sort(ALL(a)); }
template <typename T> inline void REV(T &a) { reverse(ALL(a)); }
template <typename T> inline void UNI(T &a) {
  sort(ALL(a));
  a.erase(unique(ALL(a)), a.end());
}
template <typename T> inline T LB(vector<T> &v, T a) {
  return *lower_bound(ALL(v), a);
}
template <typename T> inline int LBP(vector<T> &v, T a) {
  return lower_bound(ALL(v), a) - v.begin();
}
template <typename T> inline T UB(vector<T> &v, T a) {
  return *upper_bound(ALL(v), a);
}
template <typename T> inline int UBP(vector<T> &v, T a) {
  return upper_bound(ALL(v), a) - v.begin();
}
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) {
  REP(i, v.size()) {
    if (i)
      os << " ";
    os << v[i];
  }
  return os;
}
template <typename T> istream &operator>>(istream &is, vector<T> &v) {
  for (T &in : v)
    is >> in;
  return is;
}
template <typename T = int> 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);
}
const lint MOD = 1000000007;
const lint INF = 0x3f3f3f3f3f3f3f3f;
const double EPS = 1e-10;
#define _DEBUG

int N;
int p[2][3];
int dp[25000010];

void _main() {
  cin >> N;
  REP(i, 2) REP(j, 3) cin >> p[i][j];
  for (int i = 0; i < 3; i++) {
    for (int j = p[0][i]; j <= N; j++) {
      dp[j] = max(dp[j], dp[j - p[0][i]] + p[1][i] - p[0][i]);
    }
  }
  N += dp[N];
  ZERO(dp);
  for (int i = 0; i < 3; i++) {
    for (int j = p[1][i]; j <= N; j++) {
      dp[j] = max(dp[j], dp[j - p[1][i]] + p[0][i] - p[1][i]);
    }
  }
  cout << N + dp[N] << endl;
}

signed main() {
#ifdef _DEBUG
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(10);
  _main();
  return 0;
}

Fixed submission:
#include <bits/stdc++.h>
#define int long long
#define lint long long
#define pii pair<int, int>
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(c) (c).begin(), (c).end()
#define ZERO(a) memset(a, 0, sizeof(a))
#define MINUS(a) memset(a, 0xff, sizeof(a))
#define MINF(a) memset(a, 0x3f, sizeof(a))
#define POW(n) (1LL << (n))
#define IN(i, a, b) (a <= i && i <= b)
using namespace std;
template <typename T> inline bool CHMIN(T &a, T b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
template <typename T> inline bool CHMAX(T &a, T b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <typename T> inline void SORT(T &a) { sort(ALL(a)); }
template <typename T> inline void REV(T &a) { reverse(ALL(a)); }
template <typename T> inline void UNI(T &a) {
  sort(ALL(a));
  a.erase(unique(ALL(a)), a.end());
}
template <typename T> inline T LB(vector<T> &v, T a) {
  return *lower_bound(ALL(v), a);
}
template <typename T> inline int LBP(vector<T> &v, T a) {
  return lower_bound(ALL(v), a) - v.begin();
}
template <typename T> inline T UB(vector<T> &v, T a) {
  return *upper_bound(ALL(v), a);
}
template <typename T> inline int UBP(vector<T> &v, T a) {
  return upper_bound(ALL(v), a) - v.begin();
}
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) {
  REP(i, v.size()) {
    if (i)
      os << " ";
    os << v[i];
  }
  return os;
}
template <typename T> istream &operator>>(istream &is, vector<T> &v) {
  for (T &in : v)
    is >> in;
  return is;
}
template <typename T = int> 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);
}
const lint MOD = 1000000007;
const lint INF = 0x3f3f3f3f3f3f3f3f;
const double EPS = 1e-10;
// #define _DEBUG

int N;
int p[2][3];
int dp[25000010];

void _main() {
  cin >> N;
  REP(i, 2) REP(j, 3) cin >> p[i][j];
  for (int i = 0; i < 3; i++) {
    for (int j = p[0][i]; j <= N; j++) {
      dp[j] = max(dp[j], dp[j - p[0][i]] + p[1][i] - p[0][i]);
    }
  }
  N += dp[N];
  ZERO(dp);
  for (int i = 0; i < 3; i++) {
    for (int j = p[1][i]; j <= N; j++) {
      dp[j] = max(dp[j], dp[j - p[1][i]] + p[0][i] - p[1][i]);
    }
  }
  cout << N + dp[N] << endl;
}

signed main() {
#ifdef _DEBUG
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(10);
  _main();
  return 0;
}