oj.uz

Submission #699833

# Submission time Handle Problem Language Result Execution time Memory
699833 2023-02-18T05:40:40 Z qwerasdfzxcl Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 256 ms 3016 KB 
#include <bits/stdc++.h>

typedef long long ll;
using namespace std;
constexpr ll INF = 1e18;
int n, m, U[50050], V[50050], C[50050], D[50050];
pair<ll, int> adj[202][202];
ll d1[202], d2[202], d3[202], d4[202], dist1[202], dist2[202];
int visited[202], chk[50050], par[202];

void dijkstra(int s, ll dist[], int *chk = 0, int e = 0){
    fill(dist+1, dist+n+1, INF);
    fill(visited+1, visited+n+1, 0);

    dist[s] = 0;
    for (int i=1;i<=n;i++){
        ll mn = INF + 1, v = -1;
        for (int j=1;j<=n;j++) if (!visited[j] && dist[j] < mn){
            mn = dist[j];
            v = j;
        }

        assert(v!=-1);
        visited[v] = 1;

        for (int j=1;j<=n;j++) if (!visited[j] && dist[j] > dist[v] + adj[v][j].first){
            dist[j] = dist[v] + adj[v][j].first;
            par[j] = adj[v][j].second;
        }
    }

    if (chk && dist[e] < INF){
        for (int i=e;i!=s;i=U[par[i]]){
            chk[par[i]] = 1;
        }
    }
}

ll init(){
    for (int i=1;i<=n;i++) fill(adj[i]+1, adj[i]+n+1, pair<ll, int>(INF, -1));
    for (int i=1;i<=m;i++){
        adj[U[i]][V[i]] = min(adj[U[i]][V[i]], pair<ll, int>(C[i], i));
    }

    dijkstra(1, d1, chk, n);
    dijkstra(n, d3, chk, 1);

    for (int i=1;i<=n;i++) fill(adj[i]+1, adj[i]+n+1, pair<ll, int>(INF, -1));
    for (int i=1;i<=m;i++){
        adj[V[i]][U[i]] = min(adj[V[i]][U[i]], pair<ll, int>(C[i], i));
    }

    dijkstra(n, d2);
    dijkstra(1, d4);

    return d1[n] + d3[1];
}

ll solve(int idx){
    for (int i=1;i<=n;i++) fill(adj[i]+1, adj[i]+n+1, pair<ll, int>(INF, -1));
    for (int i=1;i<=m;i++){
        if (i!=idx) adj[U[i]][V[i]] = min(adj[U[i]][V[i]], pair<ll, int>(C[i], i));
        else adj[V[i]][U[i]] = min(adj[V[i]][U[i]], pair<ll, int>(C[i], i));
    }

    dijkstra(1, dist1);
    dijkstra(n, dist2);
    return dist1[n] + dist2[1];
}

int main(){
    scanf("%d %d", &n, &m);
    for (int i=1;i<=m;i++) scanf("%d %d %d %d", U+i, V+i, C+i, D+i);

    ll ans = init();
    for (int i=1;i<=m;i++){
        if (chk[i]) ans = min(ans, solve(i) + D[i]);
        else ans = min(ans, min(d1[n], d1[V[i]] + C[i] + d2[U[i]]) + min(d3[1], d3[V[i]] + C[i] + d4[U[i]]) + D[i]);
    }

    printf("%lld\n", ans>=INF?-1:ans);
    return 0;
}

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:72:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
ho_t4.cpp:73:33: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |     for (int i=1;i<=m;i++) scanf("%d %d %d %d", U+i, V+i, C+i, D+i);
      |                            ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 980 KB Output is correct
2 Correct 1 ms 980 KB Output is correct
3 Correct 6 ms 980 KB Output is correct
4 Correct 8 ms 1016 KB Output is correct
5 Correct 1 ms 476 KB Output is correct
6 Correct 1 ms 980 KB Output is correct
7 Correct 1 ms 320 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 97 ms 988 KB Output is correct
11 Correct 117 ms 988 KB Output is correct
12 Correct 111 ms 992 KB Output is correct
13 Correct 2 ms 988 KB Output is correct
14 Correct 6 ms 1016 KB Output is correct
15 Correct 4 ms 980 KB Output is correct
16 Correct 6 ms 964 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 2636 KB Output is correct
2 Correct 25 ms 2680 KB Output is correct
3 Correct 26 ms 2800 KB Output is correct
4 Correct 5 ms 968 KB Output is correct
5 Correct 8 ms 1008 KB Output is correct
6 Correct 1 ms 980 KB Output is correct
7 Correct 1 ms 952 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 21 ms 2872 KB Output is correct
10 Correct 20 ms 2792 KB Output is correct
11 Correct 29 ms 3016 KB Output is correct
12 Correct 26 ms 2800 KB Output is correct
13 Correct 26 ms 2892 KB Output is correct
14 Correct 30 ms 2968 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 984 KB Output is correct
2 Correct 3 ms 980 KB Output is correct
3 Correct 17 ms 2256 KB Output is correct
4 Correct 2 ms 980 KB Output is correct
5 Correct 21 ms 2560 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 18 ms 2564 KB Output is correct
9 Correct 18 ms 2672 KB Output is correct
10 Correct 21 ms 2564 KB Output is correct
11 Correct 20 ms 2552 KB Output is correct
12 Correct 20 ms 2636 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 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 1 ms 340 KB Output is correct
18 Correct 1 ms 312 KB Output is correct
19 Correct 20 ms 2624 KB Output is correct
20 Correct 20 ms 2636 KB Output is correct
21 Correct 21 ms 2644 KB Output is correct
22 Correct 20 ms 2636 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 980 KB Output is correct
2 Correct 1 ms 980 KB Output is correct
3 Correct 6 ms 980 KB Output is correct
4 Correct 8 ms 1016 KB Output is correct
5 Correct 1 ms 476 KB Output is correct
6 Correct 1 ms 980 KB Output is correct
7 Correct 1 ms 320 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 97 ms 988 KB Output is correct
11 Correct 117 ms 988 KB Output is correct
12 Correct 111 ms 992 KB Output is correct
13 Correct 2 ms 988 KB Output is correct
14 Correct 6 ms 1016 KB Output is correct
15 Correct 4 ms 980 KB Output is correct
16 Correct 6 ms 964 KB Output is correct
17 Correct 25 ms 2636 KB Output is correct
18 Correct 25 ms 2680 KB Output is correct
19 Correct 26 ms 2800 KB Output is correct
20 Correct 5 ms 968 KB Output is correct
21 Correct 8 ms 1008 KB Output is correct
22 Correct 1 ms 980 KB Output is correct
23 Correct 1 ms 952 KB Output is correct
24 Correct 0 ms 340 KB Output is correct
25 Correct 21 ms 2872 KB Output is correct
26 Correct 20 ms 2792 KB Output is correct
27 Correct 29 ms 3016 KB Output is correct
28 Correct 26 ms 2800 KB Output is correct
29 Correct 26 ms 2892 KB Output is correct
30 Correct 30 ms 2968 KB Output is correct
31 Correct 5 ms 984 KB Output is correct
32 Correct 3 ms 980 KB Output is correct
33 Correct 17 ms 2256 KB Output is correct
34 Correct 2 ms 980 KB Output is correct
35 Correct 21 ms 2560 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 0 ms 340 KB Output is correct
38 Correct 18 ms 2564 KB Output is correct
39 Correct 18 ms 2672 KB Output is correct
40 Correct 21 ms 2564 KB Output is correct
41 Correct 20 ms 2552 KB Output is correct
42 Correct 20 ms 2636 KB Output is correct
43 Correct 0 ms 340 KB Output is correct
44 Correct 1 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 1 ms 340 KB Output is correct
48 Correct 1 ms 312 KB Output is correct
49 Correct 20 ms 2624 KB Output is correct
50 Correct 20 ms 2636 KB Output is correct
51 Correct 21 ms 2644 KB Output is correct
52 Correct 20 ms 2636 KB Output is correct
53 Correct 26 ms 2756 KB Output is correct
54 Correct 31 ms 2716 KB Output is correct
55 Correct 29 ms 2596 KB Output is correct
56 Correct 6 ms 980 KB Output is correct
57 Correct 5 ms 980 KB Output is correct
58 Correct 169 ms 2516 KB Output is correct
59 Correct 193 ms 2548 KB Output is correct
60 Correct 256 ms 2544 KB Output is correct
61 Correct 166 ms 2552 KB Output is correct
62 Correct 190 ms 2576 KB Output is correct
63 Correct 252 ms 2540 KB Output is correct
64 Correct 174 ms 2540 KB Output is correct
65 Correct 191 ms 2500 KB Output is correct
66 Correct 255 ms 2620 KB Output is correct
67 Correct 15 ms 1752 KB Output is correct
68 Correct 20 ms 2880 KB Output is correct
69 Correct 20 ms 2772 KB Output is correct
70 Correct 31 ms 2908 KB Output is correct
71 Correct 28 ms 2904 KB Output is correct
72 Correct 26 ms 2820 KB Output is correct
73 Correct 27 ms 2856 KB Output is correct
74 Correct 29 ms 2912 KB Output is correct