Problem p03008 (C++)

Buggy submission (status: Runtime Error):
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define pii pair<int, int>
#define pp pair<pair<ll, ll>, pair<ll, ll>>
#define pll pair<ll, ll>
#define pdd pair<double, double>
#define vii vector<int>
#define vll vector<ll>
#define mat vector<vector<ll>>
#define lb lower_bound
#define pb push_back
#define fi first
#define sc second
#define rep(i, n) for (ll i = 0; i < n; i++)
#define rep2(i, a, b) for (ll i = a; i < b; i++)
#define repr(i, n) for (ll i = n - 1; i >= 0; i--)
#define all(x) x.begin(), x.end()
#define pq priority_queue<ll>
#define pqg priority_queue<ll, vector<ll>, greater<ll>>
#define LB(v, x) (lower_bound(v.begin(), v.end(), x) - v.begin())
#define UB(v, x) (upper_bound(v.begin(), v.end(), x) - v.begin())
#define ERASE(v)                                                               \
  sort(v.begin(), v.end());                                                    \
  v.erase(unique(v.begin(), v.end()), v.end())
// #define int ll
using namespace std;
const ll INF = (1 << 30) - 1;
const ll LLINF = (1LL << 60LL);
const ll MOD = 1000000007;
const ll mod = 998244353;
const ll MAX = 1100000;
const double pi = acos(-1);
const double eps = 1e-10;
ll dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};

template <class T> inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T> inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}

struct Timer {
  chrono::system_clock::time_point start, end;
  Timer() { start = chrono::system_clock::now(); }
  ~Timer() {
    end = chrono::system_clock::now();
    auto msec =
        chrono::duration_cast<chrono::milliseconds>(end - start).count();
    cerr << "time : " << msec << " ms" << endl;
  }
};

vll a(3), b(3);
ll dp[300010];
ll calc(vll a, vll b, ll M) {
  memset(dp, 0, sizeof(dp));
  rep(i, a.size()) {
    for (ll v = 0; v + a[i] <= M; v++) {
      chmax(dp[v + a[i]], dp[v] + b[i]);
    }
  }
  ll res = M;
  rep(v, M + 1) { chmax(res, dp[v] + M - v); }
  return res;
}

signed main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(15);
  Timer TM;

  ll n;
  cin >> n;
  rep(i, 3) cin >> a[i];
  rep(i, 3) cin >> b[i];
  n = calc(a, b, n);
  n = calc(b, a, n);
  cout << n << endl;

  return 0;
}

Fixed submission:
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define pii pair<int, int>
#define pp pair<pair<ll, ll>, pair<ll, ll>>
#define pll pair<ll, ll>
#define pdd pair<double, double>
#define vii vector<int>
#define vll vector<ll>
#define mat vector<vector<ll>>
#define lb lower_bound
#define pb push_back
#define fi first
#define sc second
#define rep(i, n) for (ll i = 0; i < n; i++)
#define rep2(i, a, b) for (ll i = a; i < b; i++)
#define repr(i, n) for (ll i = n - 1; i >= 0; i--)
#define all(x) x.begin(), x.end()
#define pq priority_queue<ll>
#define pqg priority_queue<ll, vector<ll>, greater<ll>>
#define LB(v, x) (lower_bound(v.begin(), v.end(), x) - v.begin())
#define UB(v, x) (upper_bound(v.begin(), v.end(), x) - v.begin())
#define ERASE(v)                                                               \
  sort(v.begin(), v.end());                                                    \
  v.erase(unique(v.begin(), v.end()), v.end())
// #define int ll
using namespace std;
const ll INF = (1 << 30) - 1;
const ll LLINF = (1LL << 60LL);
const ll MOD = 1000000007;
const ll mod = 998244353;
const ll MAX = 1100000;
const double pi = acos(-1);
const double eps = 1e-10;
ll dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};

template <class T> inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T> inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}

struct Timer {
  chrono::system_clock::time_point start, end;
  Timer() { start = chrono::system_clock::now(); }
  ~Timer() {
    end = chrono::system_clock::now();
    auto msec =
        chrono::duration_cast<chrono::milliseconds>(end - start).count();
    cerr << "time : " << msec << " ms" << endl;
  }
};

vll a(3), b(3);
ll dp[30000010];
ll calc(vll a, vll b, ll M) {
  memset(dp, 0, sizeof(dp));
  rep(i, a.size()) {
    for (ll v = 0; v + a[i] <= M; v++) {
      chmax(dp[v + a[i]], dp[v] + b[i]);
    }
  }
  ll res = M;
  rep(v, M + 1) { chmax(res, dp[v] + M - v); }
  return res;
}

signed main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(15);
  Timer TM;

  ll n;
  cin >> n;
  rep(i, 3) cin >> a[i];
  rep(i, 3) cin >> b[i];
  n = calc(a, b, n);
  n = calc(b, a, n);
  cout << n << endl;

  return 0;
}