Problem p02703 (C++)

Buggy submission (status: Time Limit Exceeded):
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using ll = long long;
using P = pair<int, int>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e18;
constexpr long long MOD = 1e9 + 7;

#define MAX 4000

signed main() {
  int n, m, s;
  cin >> n >> m >> s;
  using T = tuple<ll, ll, ll>;
  vector<T> G[n];
  int u, v, a, b;
  rep(i, m) {
    cin >> u >> v >> a >> b;
    u--;
    v--;
    G[u].emplace_back(v, a, b);
    G[v].emplace_back(u, a, b);
  }
  ll c[n], d[n];
  rep(i, n) { cin >> c[i] >> d[i]; }
  ll dist[n][MAX + 1];
  fill(dist[0], dist[n], LINF);
  priority_queue<T, vector<T>, greater<T>> que;
  for (int j = 0;; j++) {
    int nxt = min(s + c[0] * j, (ll)MAX);
    dist[0][nxt] = d[0] * j;
    que.emplace(dist[0][nxt], nxt, 0);
    if (s + c[0] * j > MAX)
      break;
  }
  while (!que.empty()) {
    T t = que.top();
    que.pop();
    int cnt = get<1>(t), v = get<2>(t);
    if (dist[v][cnt] < get<0>(t))
      continue;
    for (int i = 0; i < G[v].size(); i++) {
      int to = get<0>(G[v][i]), need = get<1>(G[v][i]);
      ll cost = get<2>(G[v][i]);
      for (int j = 0;; j++) {
        if (cnt - need < 0)
          break;
        int nxt = min(cnt - need + c[to] * j, (ll)MAX);
        if (dist[to][nxt] > dist[v][cnt] + cost + d[to] * j) {
          dist[to][nxt] = dist[v][cnt] + cost + d[to] * j;
          que.emplace(dist[to][nxt], nxt, to);
        }
        if (cnt - need + c[to] * j > MAX)
          break;
      }
    }
  }
  for (int v = 1; v < n; v++) {
    ll ans = LINF;
    for (int j = 0; j <= MAX; j++) {
      ans = min(ans, dist[v][j]);
    }
    cout << ans << endl;
  }
  return 0;
}

Fixed submission:
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define ALL(v) (v).begin(), (v).end()
using ll = long long;
using P = pair<int, int>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e18;
constexpr long long MOD = 1e9 + 7;

#define MAX 2500

signed main() {
  int n, m, s;
  cin >> n >> m >> s;
  using T = tuple<ll, ll, ll>;
  vector<T> G[n];
  int u, v, a, b;
  rep(i, m) {
    cin >> u >> v >> a >> b;
    u--;
    v--;
    G[u].emplace_back(v, a, b);
    G[v].emplace_back(u, a, b);
  }
  ll c[n], d[n];
  rep(i, n) { cin >> c[i] >> d[i]; }
  ll dist[n][MAX + 1];
  fill(dist[0], dist[n], LINF);
  priority_queue<T, vector<T>, greater<T>> que;
  for (int j = 0;; j++) {
    int nxt = min(s + c[0] * j, (ll)MAX);
    dist[0][nxt] = d[0] * j;
    que.emplace(dist[0][nxt], nxt, 0);
    if (s + c[0] * j > MAX)
      break;
  }
  while (!que.empty()) {
    T t = que.top();
    que.pop();
    int cnt = get<1>(t), v = get<2>(t);
    if (dist[v][cnt] < get<0>(t))
      continue;
    for (int i = 0; i < G[v].size(); i++) {
      int to = get<0>(G[v][i]), need = get<1>(G[v][i]);
      ll cost = get<2>(G[v][i]);
      for (int j = 0;; j++) {
        if (cnt - need < 0)
          break;
        int nxt = min(cnt - need + c[to] * j, (ll)MAX);
        if (dist[to][nxt] > dist[v][cnt] + cost + d[to] * j) {
          dist[to][nxt] = dist[v][cnt] + cost + d[to] * j;
          que.emplace(dist[to][nxt], nxt, to);
        }
        if (cnt - need + c[to] * j > MAX)
          break;
      }
    }
  }
  for (int v = 1; v < n; v++) {
    ll ans = LINF;
    for (int j = 0; j <= MAX; j++) {
      ans = min(ans, dist[v][j]);
    }
    cout << ans << endl;
  }
  return 0;
}