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답안 #740642

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
740642 2023-05-12T23:19:33 Z stevancv Olympic Bus (JOI20_ho_t4) C++14
21 / 100
 717 ms 4020 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 200 + 2;
const int M = 5e4 + 2;
const ll linf = 1e18;
ll dist[N][N], di[N];
set<pair<int, int>> g[N];
int u[M], v[M], c[M], d[M], is[M], prv[N], n, m;
void Dijkstra(int x) {
    for (int i = 0; i < n; i++) di[i] = linf;
    vector<int> was(n);
    priority_queue<pair<ll, int>> pq;
    di[x] = 0;
    pq.push({0, x});
    while (!pq.empty()) {
        ll v = -pq.top().first;
        int s = pq.top().second;
        pq.pop();
        if (was[s] == 1) continue;
        was[s] = 1;
        for (auto zz : g[s]) {
            int u = zz.first; int i = zz.second;
            if (di[u] > v + c[i]) {
                di[u] = v + c[i];
                pq.push({-di[u], u});
                prv[u] = i;
            }
        }
    }
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m;
    for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) if (i != j) dist[i][j] = linf;
    for (int i = 0; i < m; i++) {
        cin >> u[i] >> v[i] >> c[i] >> d[i];
        u[i] -= 1; v[i] -= 1;
        smin(dist[u[i]][v[i]],(ll) c[i]);
        g[u[i]].insert({v[i], i});
    }
    for (int k = 0; k < n; k++) for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) smin(dist[i][j], dist[i][k] + dist[k][j]);
    for (int i = 0; i < n; i++) prv[i] = -1;
    Dijkstra(0);
    for (int i = 0; i < n; i++) if (prv[i] != -1) is[prv[i]] = 1;
    for (int i = 0; i < n; i++) prv[i] = -1;
    Dijkstra(n - 1);
    for (int i = 0; i < n; i++) if (prv[i] != -1) is[prv[i]] = 1;
    ll ans = linf;
    if (dist[0][n - 1] != linf && dist[n - 1][0] != linf) ans = dist[0][n - 1] + dist[n - 1][0];
    for (int i = 0; i < m; i++) {
        if (is[i] == 0) {
            ll d1 = min(dist[0][n - 1], dist[0][v[i]] + c[i] + dist[u[i]][n - 1]);
            ll d2 = min(dist[n - 1][0], dist[n - 1][v[i]] + c[i] + dist[u[i]][0]);
            if (d1 < linf && d2 < linf) smin(ans, d1 + d2 + d[i]);
            continue;
        }
        g[u[i]].erase({v[i], i});
        g[v[i]].insert({u[i], i});
        ll ret = d[i];
        Dijkstra(0);
        if (di[n - 1] == linf) continue;
        ret += di[n - 1];
        Dijkstra(n - 1);
        if (di[0] == linf) continue;
        ret += di[0];
        smin(ans, ret);
        g[v[i]].erase({u[i], i});
        g[u[i]].insert({v[i], i});
    }
    if (ans == linf) ans = -1;
    cout << ans << en;
    return 0;
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 724 KB Output is correct
2 Correct 10 ms 596 KB Output is correct
3 Correct 29 ms 852 KB Output is correct
4 Correct 29 ms 724 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 8 ms 692 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 300 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 28 ms 724 KB Output is correct
11 Correct 18 ms 856 KB Output is correct
12 Correct 32 ms 724 KB Output is correct
13 Correct 11 ms 744 KB Output is correct
14 Correct 17 ms 744 KB Output is correct
15 Incorrect 12 ms 740 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 539 ms 3992 KB Output is correct
2 Correct 572 ms 4020 KB Output is correct
3 Correct 523 ms 3996 KB Output is correct
4 Correct 28 ms 824 KB Output is correct
5 Correct 16 ms 740 KB Output is correct
6 Correct 8 ms 596 KB Output is correct
7 Correct 9 ms 596 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 82 ms 3896 KB Output is correct
10 Correct 109 ms 3964 KB Output is correct
11 Correct 140 ms 3920 KB Output is correct
12 Correct 353 ms 4008 KB Output is correct
13 Correct 117 ms 3980 KB Output is correct
14 Incorrect 89 ms 3956 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 744 KB Output is correct
2 Correct 9 ms 596 KB Output is correct
3 Correct 646 ms 3244 KB Output is correct
4 Correct 9 ms 596 KB Output is correct
5 Correct 717 ms 3964 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 132 ms 3916 KB Output is correct
9 Correct 162 ms 3940 KB Output is correct
10 Correct 396 ms 3964 KB Output is correct
11 Correct 215 ms 3888 KB Output is correct
12 Correct 224 ms 3908 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 526 ms 3900 KB Output is correct
20 Correct 173 ms 3964 KB Output is correct
21 Correct 195 ms 3916 KB Output is correct
22 Correct 200 ms 3916 KB Output is correct

Subtask #4
0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 724 KB Output is correct
2 Correct 10 ms 596 KB Output is correct
3 Correct 29 ms 852 KB Output is correct
4 Correct 29 ms 724 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 8 ms 692 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 300 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 28 ms 724 KB Output is correct
11 Correct 18 ms 856 KB Output is correct
12 Correct 32 ms 724 KB Output is correct
13 Correct 11 ms 744 KB Output is correct
14 Correct 17 ms 744 KB Output is correct
15 Incorrect 12 ms 740 KB Output isn't correct
16 Halted 0 ms 0 KB -