Problem p02787 (C++)

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

using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define reps(i, n) for (int i = 1; i <= (int)(n); ++i)
#define repd(i, n) for (int i = (int)(n - 1); i >= 0; --i)
#define repds(i, n) for (int i = (int)(n); i > 0; --i)
#define loop(i, x, n) for (int i = (int)(x); i < (n); ++i)
#define loops(i, x, n) for (int i = (int)(x); i <= (n); ++i)
#define loopd(i, x, n) for (int i = (int)(x); i > (n); --i)
#define loopds(i, x, n) for (int i = (int)(x); i >= (n); --i)
#define itrep(i, s) for (auto i = begin(s); i != end(s); ++i)
#define itrepd(i, s) for (auto i = --end(s); i != begin(s); --i)
#define all(f, x, ...)                                                         \
  [&](decltype(x) &whole) {                                                    \
    return (f)(begin(whole), end(whole), ##__VA_ARGS__);                       \
  }(x)
#define rall(f, x, ...)                                                        \
  [&](decltype(x) &whole) {                                                    \
    return (f)(rbegin(whole), rend(whole), ##__VA_ARGS__);                     \
  }(x)
using ll = long long;
using ld = long double;
constexpr ll inf = static_cast<ll>(1e17);
constexpr int iinf = static_cast<int>(1e9);
constexpr double dinf = 1e10;
constexpr ld ldinf = 1e17;
ll mod = static_cast<ll>(1e9 + 7);
std::ostream &endn(std::ostream &os) { return os.put(os.widen('\n')); }
template <class T> constexpr int sz(const T &a) { return (int)a.size(); }
template <class T> constexpr T pow2(const T a) { return a * a; }
template <class T, class... Args> constexpr T mins(T &a, Args... args) {
  return a = min<T>({a, args...});
}
template <class T, class... Args> constexpr T maxs(T &a, Args... args) {
  return a = max<T>({a, args...});
}
template <typename A, size_t N, typename T>
void fillArray(A (&array)[N], const T &val) {
  std::fill((T *)array, (T *)(array + N), val);
}

ll h;
int n;
ll a[105], b[105];
ll dp[10005];
void solve() {
  cin >> h >> n;
  rep(i, n) cin >> a[i] >> b[i];

  fillArray(dp, inf);
  dp[0] = 0;
  rep(i, n) rep(j, 10002) {
    if (j >= a[i])
      mins(dp[j], dp[j - a[i]] + b[i]);
  }

  ll ans = inf;
  loop(i, h, 10002) mins(ans, dp[i]);
  cout << ans << endn;
}

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(15);
  solve();
  cout << flush;
  return 0;
}


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

using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define reps(i, n) for (int i = 1; i <= (int)(n); ++i)
#define repd(i, n) for (int i = (int)(n - 1); i >= 0; --i)
#define repds(i, n) for (int i = (int)(n); i > 0; --i)
#define loop(i, x, n) for (int i = (int)(x); i < (n); ++i)
#define loops(i, x, n) for (int i = (int)(x); i <= (n); ++i)
#define loopd(i, x, n) for (int i = (int)(x); i > (n); --i)
#define loopds(i, x, n) for (int i = (int)(x); i >= (n); --i)
#define itrep(i, s) for (auto i = begin(s); i != end(s); ++i)
#define itrepd(i, s) for (auto i = --end(s); i != begin(s); --i)
#define all(f, x, ...)                                                         \
  [&](decltype(x) &whole) {                                                    \
    return (f)(begin(whole), end(whole), ##__VA_ARGS__);                       \
  }(x)
#define rall(f, x, ...)                                                        \
  [&](decltype(x) &whole) {                                                    \
    return (f)(rbegin(whole), rend(whole), ##__VA_ARGS__);                     \
  }(x)
using ll = long long;
using ld = long double;
constexpr ll inf = static_cast<ll>(1e17);
constexpr int iinf = static_cast<int>(1e9);
constexpr double dinf = 1e10;
constexpr ld ldinf = 1e17;
ll mod = static_cast<ll>(1e9 + 7);
std::ostream &endn(std::ostream &os) { return os.put(os.widen('\n')); }
template <class T> constexpr int sz(const T &a) { return (int)a.size(); }
template <class T> constexpr T pow2(const T a) { return a * a; }
template <class T, class... Args> constexpr T mins(T &a, Args... args) {
  return a = min<T>({a, args...});
}
template <class T, class... Args> constexpr T maxs(T &a, Args... args) {
  return a = max<T>({a, args...});
}
template <typename A, size_t N, typename T>
void fillArray(A (&array)[N], const T &val) {
  std::fill((T *)array, (T *)(array + N), val);
}

ll h;
int n;
ll a[1005], b[1005];
ll dp[10005];
void solve() {
  cin >> h >> n;
  rep(i, n) cin >> a[i] >> b[i];

  fillArray(dp, inf);
  dp[0] = 0;
  rep(i, n) rep(j, 10002) {
    if (j >= a[i])
      mins(dp[j], dp[j - a[i]] + b[i]);
  }

  ll ans = inf;
  loop(i, h, 10002) mins(ans, dp[i]);
  cout << ans << endn;
}

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(15);
  solve();
  cout << flush;
  return 0;
}