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Submission #740644

# Submission time Handle Problem Language Result Execution time Memory
740644 2023-05-12T23:26:36 Z stevancv Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 940 ms 3572 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];
vector<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]].push_back({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;
        }
        for (int j = 0; j < n; j++) g[j].clear();
        for (int j = 0; j < m; j++) {
            if (i == j) g[v[j]].push_back({u[j], j});
            else g[u[j]].push_back({v[j], j});
        }
        ll ret = d[i];
        if (ans <= ret) continue;
        Dijkstra(0);
        ret += di[n - 1];
        if (ans <= ret) continue;
        Dijkstra(n - 1);
        if (di[0] == linf) continue;
        ret += di[0];
        smin(ans, ret);
    }
    if (ans == linf) ans = -1;
    cout << ans << en;
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 596 KB Output is correct
2 Correct 9 ms 676 KB Output is correct
3 Correct 12 ms 596 KB Output is correct
4 Correct 12 ms 596 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 9 ms 684 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 26 ms 596 KB Output is correct
11 Correct 34 ms 596 KB Output is correct
12 Correct 30 ms 596 KB Output is correct
13 Correct 11 ms 708 KB Output is correct
14 Correct 19 ms 716 KB Output is correct
15 Correct 12 ms 596 KB Output is correct
16 Correct 16 ms 596 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 164 ms 2464 KB Output is correct
2 Correct 232 ms 2468 KB Output is correct
3 Correct 156 ms 2376 KB Output is correct
4 Correct 26 ms 860 KB Output is correct
5 Correct 16 ms 596 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 92 ms 2248 KB Output is correct
10 Correct 88 ms 2288 KB Output is correct
11 Correct 151 ms 2324 KB Output is correct
12 Correct 155 ms 2440 KB Output is correct
13 Correct 136 ms 2344 KB Output is correct
14 Correct 120 ms 2316 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 596 KB Output is correct
2 Correct 9 ms 596 KB Output is correct
3 Correct 149 ms 1888 KB Output is correct
4 Correct 11 ms 680 KB Output is correct
5 Correct 161 ms 2228 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 108 ms 2264 KB Output is correct
9 Correct 116 ms 2284 KB Output is correct
10 Correct 182 ms 2312 KB Output is correct
11 Correct 167 ms 2364 KB Output is correct
12 Correct 168 ms 2364 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 1 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 170 ms 2332 KB Output is correct
20 Correct 155 ms 2280 KB Output is correct
21 Correct 154 ms 2380 KB Output is correct
22 Correct 162 ms 2212 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 596 KB Output is correct
2 Correct 9 ms 676 KB Output is correct
3 Correct 12 ms 596 KB Output is correct
4 Correct 12 ms 596 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 9 ms 684 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 26 ms 596 KB Output is correct
11 Correct 34 ms 596 KB Output is correct
12 Correct 30 ms 596 KB Output is correct
13 Correct 11 ms 708 KB Output is correct
14 Correct 19 ms 716 KB Output is correct
15 Correct 12 ms 596 KB Output is correct
16 Correct 16 ms 596 KB Output is correct
17 Correct 164 ms 2464 KB Output is correct
18 Correct 232 ms 2468 KB Output is correct
19 Correct 156 ms 2376 KB Output is correct
20 Correct 26 ms 860 KB Output is correct
21 Correct 16 ms 596 KB Output is correct
22 Correct 8 ms 596 KB Output is correct
23 Correct 9 ms 596 KB Output is correct
24 Correct 0 ms 340 KB Output is correct
25 Correct 92 ms 2248 KB Output is correct
26 Correct 88 ms 2288 KB Output is correct
27 Correct 151 ms 2324 KB Output is correct
28 Correct 155 ms 2440 KB Output is correct
29 Correct 136 ms 2344 KB Output is correct
30 Correct 120 ms 2316 KB Output is correct
31 Correct 14 ms 596 KB Output is correct
32 Correct 9 ms 596 KB Output is correct
33 Correct 149 ms 1888 KB Output is correct
34 Correct 11 ms 680 KB Output is correct
35 Correct 161 ms 2228 KB Output is correct
36 Correct 0 ms 340 KB Output is correct
37 Correct 0 ms 340 KB Output is correct
38 Correct 108 ms 2264 KB Output is correct
39 Correct 116 ms 2284 KB Output is correct
40 Correct 182 ms 2312 KB Output is correct
41 Correct 167 ms 2364 KB Output is correct
42 Correct 168 ms 2364 KB Output is correct
43 Correct 0 ms 340 KB Output is correct
44 Correct 0 ms 340 KB Output is correct
45 Correct 0 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 0 ms 340 KB Output is correct
48 Correct 0 ms 340 KB Output is correct
49 Correct 170 ms 2332 KB Output is correct
50 Correct 155 ms 2280 KB Output is correct
51 Correct 154 ms 2380 KB Output is correct
52 Correct 162 ms 2212 KB Output is correct
53 Correct 147 ms 2296 KB Output is correct
54 Correct 183 ms 2316 KB Output is correct
55 Correct 176 ms 2324 KB Output is correct
56 Correct 11 ms 596 KB Output is correct
57 Correct 11 ms 596 KB Output is correct
58 Correct 142 ms 1948 KB Output is correct
59 Correct 172 ms 1996 KB Output is correct
60 Correct 235 ms 2032 KB Output is correct
61 Correct 143 ms 1960 KB Output is correct
62 Correct 171 ms 1952 KB Output is correct
63 Correct 233 ms 1948 KB Output is correct
64 Correct 708 ms 2484 KB Output is correct
65 Correct 719 ms 2556 KB Output is correct
66 Correct 940 ms 2628 KB Output is correct
67 Correct 12 ms 2264 KB Output is correct
68 Correct 91 ms 3416 KB Output is correct
69 Correct 93 ms 3400 KB Output is correct
70 Correct 195 ms 3572 KB Output is correct
71 Correct 148 ms 3532 KB Output is correct
72 Correct 146 ms 3476 KB Output is correct
73 Correct 147 ms 3532 KB Output is correct
74 Correct 171 ms 3496 KB Output is correct