oj.uz

Submission #905197

# Submission time Handle Problem Language Result Execution time Memory
905197 2024-01-12T17:44:08 Z andrei_iorgulescu Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 771 ms 4056 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 8 ms 604 KB Output is correct
2 Correct 8 ms 604 KB Output is correct
3 Correct 7 ms 604 KB Output is correct
4 Correct 7 ms 604 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 7 ms 636 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 2 ms 348 KB Output is correct
10 Correct 11 ms 660 KB Output is correct
11 Correct 25 ms 600 KB Output is correct
12 Correct 8 ms 604 KB Output is correct
13 Correct 11 ms 600 KB Output is correct
14 Correct 8 ms 600 KB Output is correct
15 Correct 8 ms 604 KB Output is correct
16 Correct 8 ms 664 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 1756 KB Output is correct
2 Correct 22 ms 2520 KB Output is correct
3 Correct 19 ms 1756 KB Output is correct
4 Correct 8 ms 604 KB Output is correct
5 Correct 9 ms 604 KB Output is correct
6 Correct 7 ms 604 KB Output is correct
7 Correct 8 ms 604 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 69 ms 2908 KB Output is correct
10 Correct 53 ms 2776 KB Output is correct
11 Correct 24 ms 2520 KB Output is correct
12 Correct 23 ms 2512 KB Output is correct
13 Correct 25 ms 2748 KB Output is correct
14 Correct 25 ms 2880 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 604 KB Output is correct
2 Correct 9 ms 604 KB Output is correct
3 Correct 16 ms 1756 KB Output is correct
4 Correct 7 ms 852 KB Output is correct
5 Correct 19 ms 1756 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 63 ms 2252 KB Output is correct
9 Correct 73 ms 2264 KB Output is correct
10 Correct 26 ms 2264 KB Output is correct
11 Correct 23 ms 2008 KB Output is correct
12 Correct 23 ms 1996 KB Output is correct
13 Correct 1 ms 344 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 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 2264 KB Output is correct
20 Correct 30 ms 2264 KB Output is correct
21 Correct 31 ms 2280 KB Output is correct
22 Correct 25 ms 2276 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 604 KB Output is correct
2 Correct 8 ms 604 KB Output is correct
3 Correct 7 ms 604 KB Output is correct
4 Correct 7 ms 604 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 7 ms 636 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 2 ms 348 KB Output is correct
10 Correct 11 ms 660 KB Output is correct
11 Correct 25 ms 600 KB Output is correct
12 Correct 8 ms 604 KB Output is correct
13 Correct 11 ms 600 KB Output is correct
14 Correct 8 ms 600 KB Output is correct
15 Correct 8 ms 604 KB Output is correct
16 Correct 8 ms 664 KB Output is correct
17 Correct 19 ms 1756 KB Output is correct
18 Correct 22 ms 2520 KB Output is correct
19 Correct 19 ms 1756 KB Output is correct
20 Correct 8 ms 604 KB Output is correct
21 Correct 9 ms 604 KB Output is correct
22 Correct 7 ms 604 KB Output is correct
23 Correct 8 ms 604 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 69 ms 2908 KB Output is correct
26 Correct 53 ms 2776 KB Output is correct
27 Correct 24 ms 2520 KB Output is correct
28 Correct 23 ms 2512 KB Output is correct
29 Correct 25 ms 2748 KB Output is correct
30 Correct 25 ms 2880 KB Output is correct
31 Correct 8 ms 604 KB Output is correct
32 Correct 9 ms 604 KB Output is correct
33 Correct 16 ms 1756 KB Output is correct
34 Correct 7 ms 852 KB Output is correct
35 Correct 19 ms 1756 KB Output is correct
36 Correct 1 ms 344 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 63 ms 2252 KB Output is correct
39 Correct 73 ms 2264 KB Output is correct
40 Correct 26 ms 2264 KB Output is correct
41 Correct 23 ms 2008 KB Output is correct
42 Correct 23 ms 1996 KB Output is correct
43 Correct 1 ms 344 KB Output is correct
44 Correct 1 ms 348 KB Output is correct
45 Correct 0 ms 348 KB Output is correct
46 Correct 1 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 2264 KB Output is correct
50 Correct 30 ms 2264 KB Output is correct
51 Correct 31 ms 2280 KB Output is correct
52 Correct 25 ms 2276 KB Output is correct
53 Correct 19 ms 1756 KB Output is correct
54 Correct 19 ms 1756 KB Output is correct
55 Correct 19 ms 1756 KB Output is correct
56 Correct 8 ms 604 KB Output is correct
57 Correct 7 ms 604 KB Output is correct
58 Correct 23 ms 2520 KB Output is correct
59 Correct 49 ms 2008 KB Output is correct
60 Correct 46 ms 2008 KB Output is correct
61 Correct 30 ms 2008 KB Output is correct
62 Correct 332 ms 2004 KB Output is correct
63 Correct 771 ms 2212 KB Output is correct
64 Correct 103 ms 3124 KB Output is correct
65 Correct 296 ms 3032 KB Output is correct
66 Correct 656 ms 3100 KB Output is correct
67 Correct 17 ms 3288 KB Output is correct
68 Correct 51 ms 4056 KB Output is correct
69 Correct 60 ms 4056 KB Output is correct
70 Correct 26 ms 3792 KB Output is correct
71 Correct 26 ms 3792 KB Output is correct
72 Correct 25 ms 3484 KB Output is correct
73 Correct 25 ms 4048 KB Output is correct
74 Correct 25 ms 3536 KB Output is correct