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Submission #749382

# Submission time Handle Problem Language Result Execution time Memory
749382 2023-05-27T20:45:30 Z adrilen Dreaming (IOI13_dreaming) C++17
32 / 100
 56 ms 16168 KB 
#include "dreaming.h"
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
typedef pair<int, int> pii;

constexpr int maxn = 1e5 + 5; 


bool visited[maxn] = { 0 };
int dist[maxn] = { 0 }; // Max distance to another node

basic_string <pii> adj[maxn];

pii fnd_furthest(int p, int parent)
{
    // cout << p << "\n";
    visited[p] = true;
    pii maxd = pii(p, 0);
    pii a;

    for (const pii &i : adj[p])
    {
        // cout << p << " " << i.first << "\n";
        if (i.first == parent) continue;

        a = fnd_furthest(i.first, p);
        a.second += i.second;
        if (a.second > maxd.second) {
            maxd = a;
        }
    }   
    dist[p] = max(dist[p], maxd.second);
    return maxd;
}

// Finds the node in the component with the minimal maximum distance
int fnd_min_max_dist(int p, int parent)
{
    
    int mind = dist[p];

    for (pii &i : adj[p])
    {
        if (i.first == parent) continue;

        if (dist[i.first] >= mind || dist[i.first] == 0) continue;

        mind = fnd_min_max_dist(i.first, p);
    }

    return mind;
}




int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    int n = N, m = M;

    for (int i = 0; i < m; i++)
    {
        adj[A[i]].push_back(pii(B[i], T[i]));
        adj[B[i]].push_back(pii(A[i], T[i]));
    }

    vector <int> distances;
    int max_comp = 0;

    int components = 0;
    pii a, b;
    for (int i = 0; i < n; i++)
    {
        if (!visited[i])
        {
            components ++;
            a = fnd_furthest(i, -1);

            b = fnd_furthest(a.first, -1);
            a = fnd_furthest(b.first, -1);
            // cout << a.first << " " << b.first << " " << a.second << " " << fnd_min_max_dist(a.first, -1) << "\n";
            // We have now the diameter by a, b

            max_comp = max(max_comp, a.second);
            distances.emplace_back(fnd_min_max_dist(a.first, -1));

        }
    }

    // for (int i = 0; i < n; i++) cout << dist[i] << " ";
    // cout << "\n"; 


    sort(distances.begin(), distances.end(), greater<int>());

    if (components == 1)
    {
        return max_comp;
    } 

    if (components == 2)
    {
        return max({max_comp, distances[0] + distances[1] + L});
    }
    

    return max({max_comp, distances[0] + distances[1] + L, distances[2] + distances[1] + 2 * L});
}

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 16076 KB Output is correct
2 Correct 55 ms 16168 KB Output is correct
3 Correct 34 ms 11928 KB Output is correct
4 Correct 8 ms 5252 KB Output is correct
5 Correct 6 ms 4436 KB Output is correct
6 Correct 13 ms 6272 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 22 ms 7696 KB Output is correct
9 Correct 32 ms 9684 KB Output is correct
10 Correct 2 ms 3540 KB Output is correct
11 Correct 51 ms 11584 KB Output is correct
12 Correct 56 ms 13752 KB Output is correct
13 Correct 3 ms 3540 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 2 ms 3444 KB Output is correct
3 Incorrect 2 ms 3444 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 16076 KB Output is correct
2 Correct 55 ms 16168 KB Output is correct
3 Correct 34 ms 11928 KB Output is correct
4 Correct 8 ms 5252 KB Output is correct
5 Correct 6 ms 4436 KB Output is correct
6 Correct 13 ms 6272 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 22 ms 7696 KB Output is correct
9 Correct 32 ms 9684 KB Output is correct
10 Correct 2 ms 3540 KB Output is correct
11 Correct 51 ms 11584 KB Output is correct
12 Correct 56 ms 13752 KB Output is correct
13 Correct 3 ms 3540 KB Output is correct
14 Correct 2 ms 3412 KB Output is correct
15 Correct 2 ms 3444 KB Output is correct
16 Incorrect 2 ms 3444 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 4992 KB Output is correct
2 Correct 15 ms 5000 KB Output is correct
3 Correct 16 ms 4996 KB Output is correct
4 Correct 18 ms 5000 KB Output is correct
5 Correct 15 ms 5076 KB Output is correct
6 Correct 19 ms 5328 KB Output is correct
7 Correct 18 ms 5044 KB Output is correct
8 Correct 17 ms 5004 KB Output is correct
9 Correct 17 ms 4940 KB Output is correct
10 Correct 19 ms 5052 KB Output is correct
11 Correct 3 ms 3412 KB Output is correct
12 Correct 6 ms 4600 KB Output is correct
13 Correct 8 ms 4608 KB Output is correct
14 Correct 6 ms 4560 KB Output is correct
15 Correct 9 ms 4492 KB Output is correct
16 Correct 8 ms 4560 KB Output is correct
17 Correct 5 ms 4432 KB Output is correct
18 Correct 6 ms 4560 KB Output is correct
19 Correct 6 ms 4516 KB Output is correct
20 Correct 2 ms 3412 KB Output is correct
21 Correct 2 ms 3448 KB Output is correct
22 Correct 2 ms 3412 KB Output is correct
23 Correct 6 ms 4560 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Correct 2 ms 3444 KB Output is correct
3 Incorrect 2 ms 3444 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 16076 KB Output is correct
2 Correct 55 ms 16168 KB Output is correct
3 Correct 34 ms 11928 KB Output is correct
4 Correct 8 ms 5252 KB Output is correct
5 Correct 6 ms 4436 KB Output is correct
6 Correct 13 ms 6272 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 22 ms 7696 KB Output is correct
9 Correct 32 ms 9684 KB Output is correct
10 Correct 2 ms 3540 KB Output is correct
11 Correct 51 ms 11584 KB Output is correct
12 Correct 56 ms 13752 KB Output is correct
13 Correct 3 ms 3540 KB Output is correct
14 Correct 2 ms 3412 KB Output is correct
15 Correct 2 ms 3444 KB Output is correct
16 Incorrect 2 ms 3444 KB Output isn't correct
17 Halted 0 ms 0 KB -