oj.uz

답안 #959545

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
959545 2024-04-08T12:28:41 Z mannshah1211 Olympic Bus (JOI20_ho_t4) C++17
11 / 100
 17 ms 3716 KB 
/**
 *  author: hashman
 *  created: 
**/

#include <bits/stdc++.h>

using namespace std;

string to_string(string s) {
  return '"' + s + '"';
}

string to_string(const char* s) {
  return to_string((string) s);
}

string to_string(bool b) {
  return (b ? "true" : "false");
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
   if (!first) {
    res += ", ";
   }
   first = false;
   res += to_string(x);
  }
  res += "}";
  return res;
}

void debug_out() {
  cerr << endl;
}

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}

#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__);

constexpr int64_t inf = 1e18;

using P = pair<int64_t, int>;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector<vector<pair<int, int>>> adj(n), radj(n);
  vector<int> u(m), v(m), c(m), d(m);
  for (int i = 0; i < m; i++) {
    cin >> u[i] >> v[i] >> c[i] >> d[i];
    u[i]--; v[i]--;
    adj[u[i]].push_back(make_pair(v[i], c[i]));
    radj[v[i]].push_back(make_pair(u[i], c[i]));
  }
  auto dijkstra = [&](int source) {
    vector<int64_t> dist(n, inf);
    dist[source] = 0;
    priority_queue<P, vector<P>, greater<P>> pq;
    pq.push(make_pair(0, source));
    while (!pq.empty()) {
      auto [expected, v] = pq.top();
      pq.pop();
      if (expected != dist[v]) {
        continue;
      }
      for (auto [now, wt] : adj[v]) {
        if (dist[now] > dist[v] + wt) {
          dist[now] = dist[v] + wt;
          pq.push(make_pair(dist[now], now));
        }
      }
    }
    return dist;
  };
  auto reverse_dijkstra = [&](int source) {
    vector<int64_t> dist(n, inf);
    dist[source] = 0;
    priority_queue<P, vector<P>, greater<P>> pq;
    pq.push(make_pair(0, source));
    while (!pq.empty()) {
      auto [expected, v] = pq.top();
      pq.pop();
      if (expected != dist[v]) {
        continue;
      }
      for (auto [now, wt] : radj[v]) {
        if (dist[now] > dist[v] + wt) {
          dist[now] = dist[v] + wt;
          pq.push(make_pair(dist[now], now));
        }
      }
    }
    return dist;
  };
  vector<int64_t> from_source = dijkstra(0);
  vector<int64_t> from_dest = dijkstra(n - 1);
  vector<int64_t> rev_from_dest = reverse_dijkstra(n - 1);
  vector<int64_t> rev_from_source = reverse_dijkstra(0);
  int64_t mn = inf;
  mn = min(mn, from_source[n - 1] + from_dest[0]);
  for (int i = 0; i < m; i++) {
    int64_t from = min(from_source[v[i]] + rev_from_dest[u[i]] + c[i], from_source[n - 1]), to = min(from_dest[v[i]] + rev_from_source[u[i]] + c[i], from_dest[0]);
    if (from > inf || to > inf) {
      continue;
    }
    mn = min(mn, from + d[i] + to);
  }
  cout << ((mn == inf) ? -1 : mn) << '\n';
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Incorrect 0 ms 348 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 2392 KB Output is correct
2 Correct 14 ms 3584 KB Output is correct
3 Correct 15 ms 3672 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 456 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 15 ms 3716 KB Output is correct
10 Correct 15 ms 3716 KB Output is correct
11 Correct 15 ms 3536 KB Output is correct
12 Correct 15 ms 3676 KB Output is correct
13 Correct 15 ms 3612 KB Output is correct
14 Correct 14 ms 3676 KB Output is correct

Subtask #3
0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 10 ms 1828 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 13 ms 2396 KB Output is correct
6 Incorrect 0 ms 348 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Incorrect 0 ms 348 KB Output isn't correct
8 Halted 0 ms 0 KB -