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Submission #824985

# Submission time Handle Problem Language Result Execution time Memory
824985 2023-08-14T12:51:32 Z phoenix Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 172 ms 4092 KB 
#include<bits/stdc++.h>

using namespace std;
using ll = long long;

const int N = 1000;
const int M = 100000;
const ll INF = 1e18;

int n, m;
vector<pair<int, int>> g[2][N];
ll C[M], D[M];
pair<int, int> edges[M];

vector<vector<ll>> dist, par;

vector<ll> dijkstra(int s, int b, bool save = 0) {
    vector<ll> d(n + 1, INF);
    vector<ll> p(n + 1, -1);
    d[s] = 0;
    bool processed[n + 1] = {};
    while(1) {
        s = -1;
        for(int i = 1; i <= n; i++) {
            if(processed[i]) continue;
            if(s == -1 || d[s] > d[i]) 
                s = i;
        }
        if(s == -1) break;
        processed[s] = 1;

        for(auto [to, i] : g[b][s]) {
            if(d[to] > d[s] + C[i]) {
                p[to] = i;
                d[to] = d[s] + C[i];
            }
        }
    }
    if(save) {
        dist.push_back(d);
        par.push_back(p);
    }
    return d;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin >> n >> m;
    for(int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        edges[i] = {u, v};
        cin >> C[i] >> D[i];
        g[0][u].push_back({v, i});
        g[1][v].push_back({u, i});
    }
    dijkstra(1, 0, 1);
    dijkstra(n, 0, 1);
    dijkstra(1, 1, 1);
    dijkstra(n, 1, 1);
    int cur = n;
    set<int> way1, way2;
    while(par[0][cur] != -1) {
        way1.insert(par[0][cur]);
        cur = edges[par[0][cur]].first;
    }
    if(cur != 1) way1.clear();
    cur = 1;
    while(par[1][cur] != -1) {
        way2.insert(par[1][cur]);
        cur = edges[par[1][cur]].first;
    }
    if(cur != n) way2.clear();
    ll res = dist[0][n] + dist[1][1];

    for(int i = 0; i < m; i++) {
        ll ans = INF;
        auto [u, v] = edges[i];
        
        if(!way1.count(i) && !way2.count(i)) {
            ans = min(ans, dist[1][v] + dist[2][u] + dist[0][n] + C[i] + D[i]);
            ans = min(ans, dist[0][v] + dist[3][u] + dist[1][1] + C[i] + D[i]);
            ans = min(ans, dist[0][v] + dist[3][u] + dist[1][v] + dist[2][u] + 2 * C[i] + D[i]);
        }
        else {
            g[0][u].erase(find(g[0][u].begin(), g[0][u].end(), make_pair(v, i)));
            g[0][v].push_back({u, i});
            
            auto d1 = dijkstra(1, 0), d2 = dijkstra(n, 0);
            ans = min(ans, d1[n] + d2[1] + D[i]);
            g[0][u].push_back({v, i});
            g[0][v].erase(find(g[0][v].begin(), g[0][v].end(), make_pair(u, i)));
        }
        res = min(res, ans);
    }
    if(res >= INF) res = -1;
    cout << res;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 468 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 432 KB Output is correct
4 Correct 5 ms 476 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 264 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 37 ms 492 KB Output is correct
11 Correct 54 ms 496 KB Output is correct
12 Correct 50 ms 480 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 3 ms 468 KB Output is correct
15 Correct 2 ms 388 KB Output is correct
16 Correct 3 ms 468 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 3880 KB Output is correct
2 Correct 17 ms 3796 KB Output is correct
3 Correct 17 ms 3976 KB Output is correct
4 Correct 4 ms 468 KB Output is correct
5 Correct 3 ms 468 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 22 ms 4092 KB Output is correct
10 Correct 18 ms 4004 KB Output is correct
11 Correct 18 ms 3968 KB Output is correct
12 Correct 17 ms 3972 KB Output is correct
13 Correct 23 ms 4052 KB Output is correct
14 Correct 18 ms 4068 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 468 KB Output is correct
2 Correct 2 ms 340 KB Output is correct
3 Correct 12 ms 2900 KB Output is correct
4 Correct 1 ms 376 KB Output is correct
5 Correct 14 ms 3732 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 21 ms 3712 KB Output is correct
9 Correct 14 ms 3760 KB Output is correct
10 Correct 15 ms 3680 KB Output is correct
11 Correct 14 ms 3796 KB Output is correct
12 Correct 14 ms 3716 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 372 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 376 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 15 ms 3796 KB Output is correct
20 Correct 14 ms 3800 KB Output is correct
21 Correct 14 ms 3688 KB Output is correct
22 Correct 14 ms 3672 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 468 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 432 KB Output is correct
4 Correct 5 ms 476 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 264 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 37 ms 492 KB Output is correct
11 Correct 54 ms 496 KB Output is correct
12 Correct 50 ms 480 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 3 ms 468 KB Output is correct
15 Correct 2 ms 388 KB Output is correct
16 Correct 3 ms 468 KB Output is correct
17 Correct 16 ms 3880 KB Output is correct
18 Correct 17 ms 3796 KB Output is correct
19 Correct 17 ms 3976 KB Output is correct
20 Correct 4 ms 468 KB Output is correct
21 Correct 3 ms 468 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 22 ms 4092 KB Output is correct
26 Correct 18 ms 4004 KB Output is correct
27 Correct 18 ms 3968 KB Output is correct
28 Correct 17 ms 3972 KB Output is correct
29 Correct 23 ms 4052 KB Output is correct
30 Correct 18 ms 4068 KB Output is correct
31 Correct 3 ms 468 KB Output is correct
32 Correct 2 ms 340 KB Output is correct
33 Correct 12 ms 2900 KB Output is correct
34 Correct 1 ms 376 KB Output is correct
35 Correct 14 ms 3732 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 0 ms 340 KB Output is correct
38 Correct 21 ms 3712 KB Output is correct
39 Correct 14 ms 3760 KB Output is correct
40 Correct 15 ms 3680 KB Output is correct
41 Correct 14 ms 3796 KB Output is correct
42 Correct 14 ms 3716 KB Output is correct
43 Correct 0 ms 340 KB Output is correct
44 Correct 1 ms 372 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 0 ms 340 KB Output is correct
47 Correct 0 ms 376 KB Output is correct
48 Correct 0 ms 340 KB Output is correct
49 Correct 15 ms 3796 KB Output is correct
50 Correct 14 ms 3800 KB Output is correct
51 Correct 14 ms 3688 KB Output is correct
52 Correct 14 ms 3672 KB Output is correct
53 Correct 24 ms 3796 KB Output is correct
54 Correct 19 ms 3836 KB Output is correct
55 Correct 17 ms 3756 KB Output is correct
56 Correct 3 ms 468 KB Output is correct
57 Correct 2 ms 468 KB Output is correct
58 Correct 83 ms 3048 KB Output is correct
59 Correct 78 ms 3032 KB Output is correct
60 Correct 101 ms 3056 KB Output is correct
61 Correct 81 ms 3048 KB Output is correct
62 Correct 76 ms 3080 KB Output is correct
63 Correct 102 ms 3060 KB Output is correct
64 Correct 114 ms 3192 KB Output is correct
65 Correct 121 ms 3240 KB Output is correct
66 Correct 172 ms 3212 KB Output is correct
67 Correct 10 ms 2984 KB Output is correct
68 Correct 18 ms 4024 KB Output is correct
69 Correct 15 ms 3936 KB Output is correct
70 Correct 19 ms 3992 KB Output is correct
71 Correct 18 ms 4004 KB Output is correct
72 Correct 17 ms 4020 KB Output is correct
73 Correct 19 ms 4040 KB Output is correct
74 Correct 17 ms 3972 KB Output is correct