oj.uz

Submission #909608

# Submission time Handle Problem Language Result Execution time Memory
909608 2024-01-17T09:47:44 Z andrei_iorgulescu Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 787 ms 4060 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#define int unsigned int
 
const int inf = 1e9;
const int some_fixed_seed = 12345;
 
struct ura
{
    int u,v,c,d;
};
 
int n,m;
vector<ura>e;
int d[205][205];
vector<pair<int,int>>g[205];
 
int getdist(int sursa,int destinatie)
{
    vector<int>dist(n + 1);
    for (int i = 1; i <= n; i++)
        dist[i] = inf;
    priority_queue<pair<int,int>>pq;
    pq.push({0,sursa});
    while (!pq.empty())
    {
        int nod = pq.top().second,cost = -pq.top().first;
        if (nod == destinatie)
            return cost;
        pq.pop();
        if (dist[nod] == inf)
        {
            dist[nod] = cost;
            for (auto vecin : g[nod])
                pq.push({-(cost + vecin.second),vecin.first});
        }
    }
    return inf;
}
 
int tryrev(int idx)
{
    for (int i = 1; i <= n; i++)
        g[i].clear();
    for (int i = 0; i < e.size(); i++)
    {
        if (i == idx)
            g[e[i].v].push_back({e[i].u,e[i].c});
        else
            g[e[i].u].push_back({e[i].v,e[i].c});
    }
    return getdist(1,n) + getdist(n,1);
}
 
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++)
            if (i != j)
                d[i][j] = inf;
    for (int i = 1; i <= m; i++)
    {
        ura aux;
        cin >> aux.u >> aux.v >> aux.c >> aux.d;
        e.push_back(aux);
        d[aux.u][aux.v] = min(d[aux.u][aux.v],aux.c);
    }
    //shuffle(e.begin(),e.end(),default_random_engine(some_fixed_seed));
    for (int k = 1; k <= n; k++)
        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= n; j++)
                d[i][j] = min(d[i][j],d[i][k] + d[k][j]);
    int ans = d[1][n] + d[n][1];
    for (int i = 0; i < e.size(); i++)
    {
        auto it = e[i];
        int d1 = min(d[1][n],d[1][it.v] + d[it.u][n] + it.c);
        int d2 = min(d[n][1],d[n][it.v] + d[it.u][1] + it.c);
        int cur = d1 + d2 + it.d;
        if (cur < ans)
            ans = min(ans,it.d + tryrev(i));
    }
    if (ans >= inf)
        cout << -1;
    else
        cout << ans;
    return 0;
}
 
/**
hai sa zicem ca dau invert la muchia u->v
costul o sa fie >= cost_rev + min(dist(1,n),cost_edge + dist(1,v) + dist(u,n)) + min(dist(n,1),cost_edge + dist(n,v) + dist(u,1))
dau random shuffle la muchii si verific o muchie doar daca are acest cost < ans
teoretic as verifica log muchii, asa o sa verific ceva mai multe dar hopefully tot putine
**/

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 600 KB Output is correct
2 Correct 12 ms 604 KB Output is correct
3 Correct 7 ms 676 KB Output is correct
4 Correct 8 ms 680 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 7 ms 600 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 476 KB Output is correct
10 Correct 14 ms 860 KB Output is correct
11 Correct 25 ms 696 KB Output is correct
12 Correct 8 ms 604 KB Output is correct
13 Correct 8 ms 600 KB Output is correct
14 Correct 7 ms 604 KB Output is correct
15 Correct 8 ms 604 KB Output is correct
16 Correct 7 ms 684 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 2524 KB Output is correct
2 Correct 20 ms 3544 KB Output is correct
3 Correct 18 ms 2780 KB Output is correct
4 Correct 7 ms 604 KB Output is correct
5 Correct 8 ms 604 KB Output is correct
6 Correct 7 ms 604 KB Output is correct
7 Correct 7 ms 604 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 56 ms 4060 KB Output is correct
10 Correct 38 ms 3928 KB Output is correct
11 Correct 23 ms 3536 KB Output is correct
12 Correct 24 ms 3700 KB Output is correct
13 Correct 22 ms 3792 KB Output is correct
14 Correct 24 ms 4048 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 600 KB Output is correct
2 Correct 7 ms 584 KB Output is correct
3 Correct 16 ms 2520 KB Output is correct
4 Correct 7 ms 604 KB Output is correct
5 Correct 18 ms 2524 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 88 ms 3260 KB Output is correct
9 Correct 109 ms 3024 KB Output is correct
10 Correct 25 ms 2992 KB Output is correct
11 Correct 23 ms 3032 KB Output is correct
12 Correct 22 ms 3064 KB Output is correct
13 Correct 0 ms 600 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 24 ms 3132 KB Output is correct
20 Correct 30 ms 3164 KB Output is correct
21 Correct 25 ms 3032 KB Output is correct
22 Correct 24 ms 3028 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 600 KB Output is correct
2 Correct 12 ms 604 KB Output is correct
3 Correct 7 ms 676 KB Output is correct
4 Correct 8 ms 680 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 7 ms 600 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 476 KB Output is correct
10 Correct 14 ms 860 KB Output is correct
11 Correct 25 ms 696 KB Output is correct
12 Correct 8 ms 604 KB Output is correct
13 Correct 8 ms 600 KB Output is correct
14 Correct 7 ms 604 KB Output is correct
15 Correct 8 ms 604 KB Output is correct
16 Correct 7 ms 684 KB Output is correct
17 Correct 18 ms 2524 KB Output is correct
18 Correct 20 ms 3544 KB Output is correct
19 Correct 18 ms 2780 KB Output is correct
20 Correct 7 ms 604 KB Output is correct
21 Correct 8 ms 604 KB Output is correct
22 Correct 7 ms 604 KB Output is correct
23 Correct 7 ms 604 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 56 ms 4060 KB Output is correct
26 Correct 38 ms 3928 KB Output is correct
27 Correct 23 ms 3536 KB Output is correct
28 Correct 24 ms 3700 KB Output is correct
29 Correct 22 ms 3792 KB Output is correct
30 Correct 24 ms 4048 KB Output is correct
31 Correct 7 ms 600 KB Output is correct
32 Correct 7 ms 584 KB Output is correct
33 Correct 16 ms 2520 KB Output is correct
34 Correct 7 ms 604 KB Output is correct
35 Correct 18 ms 2524 KB Output is correct
36 Correct 1 ms 344 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 88 ms 3260 KB Output is correct
39 Correct 109 ms 3024 KB Output is correct
40 Correct 25 ms 2992 KB Output is correct
41 Correct 23 ms 3032 KB Output is correct
42 Correct 22 ms 3064 KB Output is correct
43 Correct 0 ms 600 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 0 ms 348 KB Output is correct
47 Correct 1 ms 348 KB Output is correct
48 Correct 0 ms 348 KB Output is correct
49 Correct 24 ms 3132 KB Output is correct
50 Correct 30 ms 3164 KB Output is correct
51 Correct 25 ms 3032 KB Output is correct
52 Correct 24 ms 3028 KB Output is correct
53 Correct 23 ms 2520 KB Output is correct
54 Correct 20 ms 2524 KB Output is correct
55 Correct 24 ms 2780 KB Output is correct
56 Correct 7 ms 604 KB Output is correct
57 Correct 7 ms 604 KB Output is correct
58 Correct 33 ms 3340 KB Output is correct
59 Correct 38 ms 2964 KB Output is correct
60 Correct 45 ms 3028 KB Output is correct
61 Correct 40 ms 3276 KB Output is correct
62 Correct 333 ms 3020 KB Output is correct
63 Correct 787 ms 3032 KB Output is correct
64 Correct 103 ms 3076 KB Output is correct
65 Correct 308 ms 3276 KB Output is correct
66 Correct 637 ms 3020 KB Output is correct
67 Correct 22 ms 3284 KB Output is correct
68 Correct 51 ms 4008 KB Output is correct
69 Correct 38 ms 4056 KB Output is correct
70 Correct 25 ms 3968 KB Output is correct
71 Correct 30 ms 3788 KB Output is correct
72 Correct 24 ms 3532 KB Output is correct
73 Correct 24 ms 4056 KB Output is correct
74 Correct 33 ms 3788 KB Output is correct