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Submission #369383

# Submission time Handle Problem Language Result Execution time Memory
369383 2021-02-21T13:42:51 Z phathnv Olympic Bus (JOI20_ho_t4) C++11
100 / 100
 661 ms 5624 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N = 201;
const int M = 50001;
const ll INF = 1e10;

struct edge{
    int u, v, c, d, ind;
};

int n, m;
edge eds[M];
ll dist[N][N], f[2][M], minDist[N];
int trace[N][N];
vector <edge> adj[N];

void ReadInput(){
    cin >> n >> m;
    for(int i = 1; i <= 2 * n; i++)
        for(int j = 1; j <= 2 * n; j++)
            dist[i][j] = (i != j) * INF;
    for(int i = 1; i <= m; i++){
        cin >> eds[i].u >> eds[i].v >> eds[i].c >> eds[i].d;
        eds[i].ind = i;
    }
}

ll Dijkstra(int s, int t, int revInd = 0){
    for(int i = 1; i <= n; i++)
        minDist[i] = INF;
    typedef pair<int, int> data;
    priority_queue <data, vector<data>, greater<data>> pq;
    minDist[s] = 0;
    pq.push({0, s});
    while (!pq.empty()){
        int u = pq.top().second;
        int d = pq.top().first;
        pq.pop();
        if (minDist[u] != d)
            continue;
        if (u == t)
            return minDist[u];
        for(auto e : adj[u])
            if (e.ind != revInd && minDist[e.v] > minDist[e.u] + e.c){
                minDist[e.v] = minDist[e.u] + e.c;
                pq.push({minDist[e.v], e.v});
            }
        if (eds[revInd].v == u && minDist[eds[revInd].u] > minDist[u] + eds[revInd].c){
            minDist[eds[revInd].u] = minDist[u] + eds[revInd].c;
            pq.push({minDist[eds[revInd].u], eds[revInd].u});
        }
    }
    return INF;
}

void Solve(){
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++)
            dist[i][j] = (i != j) * INF;
    for(int i = 1; i <= m; i++){
        if (dist[eds[i].u][eds[i].v] > eds[i].c){
            dist[eds[i].u][eds[i].v] = eds[i].c;
            trace[eds[i].u][eds[i].v] = i;
        }
        adj[eds[i].u].push_back(eds[i]);
    }

    for(int k = 1; k <= n; k++)
        for(int i = 1; i <= n; i++)
            for(int j = 1; j <= n; j++)
                if (dist[i][j] > dist[i][k] + dist[k][j]){
                    dist[i][j] = dist[i][k] + dist[k][j];
                    trace[i][j] = trace[i][k];
                }

    int s = 1, t = n;
    for(int num = 0; num < 2; num++){
        for(int i = 1; i <= m; i++)
            f[num][i] = min(dist[s][t], dist[s][eds[i].v] + eds[i].c + dist[eds[i].u][t]);
        if (dist[s][t] != INF){
            cerr << num << endl;
            int u = s;
            while (u != t){
                int ind = trace[u][t];
                f[num][ind] = Dijkstra(s, t, ind);
                u = eds[ind].v;
            }
        }
        swap(s, t);
    }

    ll ans = dist[1][n] + dist[n][1];
    for(int i = 1; i <= m; i++)
        ans = min(ans, f[0][i] + f[1][i] + eds[i].d);
    cout << (ans < INF? ans : -1);
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ReadInput();
    Solve();
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 1260 KB Output is correct
2 Correct 9 ms 1132 KB Output is correct
3 Correct 12 ms 1260 KB Output is correct
4 Correct 12 ms 1260 KB Output is correct
5 Correct 1 ms 620 KB Output is correct
6 Correct 10 ms 1132 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 25 ms 1260 KB Output is correct
11 Correct 24 ms 1260 KB Output is correct
12 Correct 26 ms 1260 KB Output is correct
13 Correct 11 ms 1260 KB Output is correct
14 Correct 11 ms 1260 KB Output is correct
15 Correct 11 ms 1260 KB Output is correct
16 Correct 11 ms 1260 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 5356 KB Output is correct
2 Correct 35 ms 5228 KB Output is correct
3 Correct 41 ms 5484 KB Output is correct
4 Correct 12 ms 1260 KB Output is correct
5 Correct 11 ms 1260 KB Output is correct
6 Correct 10 ms 1152 KB Output is correct
7 Correct 9 ms 1132 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 37 ms 5356 KB Output is correct
10 Correct 39 ms 5356 KB Output is correct
11 Correct 34 ms 5356 KB Output is correct
12 Correct 36 ms 5508 KB Output is correct
13 Correct 34 ms 5504 KB Output is correct
14 Correct 34 ms 5624 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 1260 KB Output is correct
2 Correct 10 ms 1132 KB Output is correct
3 Correct 25 ms 4076 KB Output is correct
4 Correct 10 ms 1132 KB Output is correct
5 Correct 29 ms 5100 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 30 ms 5184 KB Output is correct
9 Correct 29 ms 5100 KB Output is correct
10 Correct 29 ms 5100 KB Output is correct
11 Correct 30 ms 5228 KB Output is correct
12 Correct 30 ms 5124 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 30 ms 5228 KB Output is correct
20 Correct 30 ms 5100 KB Output is correct
21 Correct 34 ms 5100 KB Output is correct
22 Correct 29 ms 5100 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 1260 KB Output is correct
2 Correct 9 ms 1132 KB Output is correct
3 Correct 12 ms 1260 KB Output is correct
4 Correct 12 ms 1260 KB Output is correct
5 Correct 1 ms 620 KB Output is correct
6 Correct 10 ms 1132 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 25 ms 1260 KB Output is correct
11 Correct 24 ms 1260 KB Output is correct
12 Correct 26 ms 1260 KB Output is correct
13 Correct 11 ms 1260 KB Output is correct
14 Correct 11 ms 1260 KB Output is correct
15 Correct 11 ms 1260 KB Output is correct
16 Correct 11 ms 1260 KB Output is correct
17 Correct 38 ms 5356 KB Output is correct
18 Correct 35 ms 5228 KB Output is correct
19 Correct 41 ms 5484 KB Output is correct
20 Correct 12 ms 1260 KB Output is correct
21 Correct 11 ms 1260 KB Output is correct
22 Correct 10 ms 1152 KB Output is correct
23 Correct 9 ms 1132 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 37 ms 5356 KB Output is correct
26 Correct 39 ms 5356 KB Output is correct
27 Correct 34 ms 5356 KB Output is correct
28 Correct 36 ms 5508 KB Output is correct
29 Correct 34 ms 5504 KB Output is correct
30 Correct 34 ms 5624 KB Output is correct
31 Correct 11 ms 1260 KB Output is correct
32 Correct 10 ms 1132 KB Output is correct
33 Correct 25 ms 4076 KB Output is correct
34 Correct 10 ms 1132 KB Output is correct
35 Correct 29 ms 5100 KB Output is correct
36 Correct 1 ms 364 KB Output is correct
37 Correct 1 ms 364 KB Output is correct
38 Correct 30 ms 5184 KB Output is correct
39 Correct 29 ms 5100 KB Output is correct
40 Correct 29 ms 5100 KB Output is correct
41 Correct 30 ms 5228 KB Output is correct
42 Correct 30 ms 5124 KB Output is correct
43 Correct 1 ms 364 KB Output is correct
44 Correct 1 ms 364 KB Output is correct
45 Correct 1 ms 492 KB Output is correct
46 Correct 1 ms 364 KB Output is correct
47 Correct 1 ms 364 KB Output is correct
48 Correct 1 ms 364 KB Output is correct
49 Correct 30 ms 5228 KB Output is correct
50 Correct 30 ms 5100 KB Output is correct
51 Correct 34 ms 5100 KB Output is correct
52 Correct 29 ms 5100 KB Output is correct
53 Correct 36 ms 5100 KB Output is correct
54 Correct 37 ms 5100 KB Output is correct
55 Correct 35 ms 5100 KB Output is correct
56 Correct 12 ms 1260 KB Output is correct
57 Correct 12 ms 1280 KB Output is correct
58 Correct 89 ms 4204 KB Output is correct
59 Correct 91 ms 4204 KB Output is correct
60 Correct 96 ms 4204 KB Output is correct
61 Correct 75 ms 4204 KB Output is correct
62 Correct 97 ms 4332 KB Output is correct
63 Correct 92 ms 4224 KB Output is correct
64 Correct 661 ms 4572 KB Output is correct
65 Correct 596 ms 4736 KB Output is correct
66 Correct 585 ms 4564 KB Output is correct
67 Correct 16 ms 3552 KB Output is correct
68 Correct 34 ms 5356 KB Output is correct
69 Correct 34 ms 5416 KB Output is correct
70 Correct 35 ms 5356 KB Output is correct
71 Correct 34 ms 5228 KB Output is correct
72 Correct 34 ms 5228 KB Output is correct
73 Correct 34 ms 5484 KB Output is correct
74 Correct 35 ms 5356 KB Output is correct