oj.uz

Submission #868973

# Submission time Handle Problem Language Result Execution time Memory
868973 2023-11-02T17:16:47 Z StefanL2005 Dreaming (IOI13_dreaming) C++14
0 / 100
 493 ms 17656 KB 
#include <bits/stdc++.h>
#include "dreaming.h"
using namespace std;
#define ll long long
//ifstream in("file.in");

int k = 0;

void DFS_sum(int node, int p, vector<vector<int>> &vec, vector<vector<int>> &cost, vector<int> &Sum, vector<int> &col)
{
    col[node] = k;
    for (int i = 0; i < vec[node].size(); i++)
    {
        int vecin = vec[node][i];
        if (vecin == p)
            continue;

        DFS_sum(vecin, node, vec, cost, Sum, col);
        Sum[node] = max(Sum[node], Sum[vecin] + cost[node][i]);
    }
}

int DFS_Spec(int node, int p, vector<vector<int>> &vec, vector<vector<int>> &cost, vector<int> &down_sum, int &sum1, int &sum2, int &ans)
{
    if (vec[node].size() == 0)
        return 0;
    if (vec[node].size() == 1 && p != -1)
        return ans;

    int path = -1;
    for (int i = 0; i < vec[node].size(); i++)
    {
        int vecin = vec[node][i];
        if (vecin == p)
            continue;

        if (down_sum[vecin] + cost[node][i] == sum1)
        {
            path = i;
            continue;
        }
        if (down_sum[vecin] + cost[node][i] > sum2)
            sum2 = down_sum[vecin] + cost[node][i];
    }

    if (vec[node].size() > 1 && sum2 == 0)
        sum2 = sum1;

    if (p == -1)
        return ans;
    sum1 -= cost[node][path];
    sum2 += cost[node][path];
    
    ans = min(ans, max(sum2, sum1));

    return DFS_Spec(vec[node][path], node, vec, cost, down_sum, sum1, sum2, ans);
}

int graph_hub(int node, vector<vector<int>> &vec, vector<vector<int>> &cost, vector<int> &col)
{
    vector<int> down_sum(vec.size(), 0);
    DFS_sum(node, -1, vec, cost, down_sum, col);

    int sum1 = 0, sum2 = 0;
    
    for (int i = 0; i < vec[node].size(); i++)
        sum1 = max(sum1, down_sum[vec[node][i]] + cost[node][i]);

    int ans = sum1;
    
    return DFS_Spec(node, -1, vec, cost, down_sum, sum1, sum2, ans);
}
int travelTime(int n, int m, int l, int A[], int B[], int C[])
{
    vector<vector<int>> vec(n);
    vector<vector<int>> cost(n);
    vector<int> col(n, -1);
    for (int i = 0; i < m; i++)
    {
        vec[A[i]].push_back(B[i]);
        vec[B[i]].push_back(A[i]);
        cost[A[i]].push_back(C[i]);
        cost[B[i]].push_back(C[i]);     
    }

    if (m == n - 1)
    {
        vector<int> down_sum(vec.size(), 0);
        DFS_sum(0, -1, vec, cost, down_sum, col);
        int sum1 = 0, sum2 = 0;

        for (int i = 0; i < vec[0].size(); i++)
        {
            int S = down_sum[vec[0][i]] + cost[0][i];
            if (S > sum1)
            {
                sum2 = sum1;
                sum1 = S;
            }
            else
                sum2 = max(sum2, S);
        }

        return sum1 + sum2;
    }

    vector<int> L;
    int Max = 0;
    for (int i = 0; i < n; i++)
    {
        if (col[i] == -1)
        {
            int ans = graph_hub(i, vec, cost, col);
            k++;
            Max = max(Max, ans);
            L.push_back(ans);
        }
    }

    pair<int, int> secMax = make_pair(0, 0);
    bool ok = false;
    for (int i = 0; i < L.size(); i++)
    {
        if (L[i] == Max && !ok)
        {
            ok = true;
            continue;
        }

        if (L[i] > secMax.first)
        {
            secMax.second = secMax.first;
            secMax.first = L[i];
        }
        else
            secMax.second = max(secMax.second, L[i]);
    }

    return max(Max + l + secMax.first, secMax.first + l * 2 + secMax.second);
}

/*
int main()
{
    int n, m, l;
    in>> n >> m >> l;
    vector<int> A(m), B(m), C(m);
    for (int i = 0; i < m; i++)
        in>> A[i];
    for (int i = 0; i < m; i++)
        in>> B[i];
    for (int i = 0; i < m; i++)
        in>> C[i];

    cout<< travelTime(n, m, l, A, B, C);
    return 0;
}*/

Compilation message

dreaming.cpp: In function 'void DFS_sum(int, int, std::vector<std::vector<int> >&, std::vector<std::vector<int> >&, std::vector<int>&, std::vector<int>&)':
dreaming.cpp:12:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for (int i = 0; i < vec[node].size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int DFS_Spec(int, int, std::vector<std::vector<int> >&, std::vector<std::vector<int> >&, std::vector<int>&, int&, int&, int&)':
dreaming.cpp:31:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for (int i = 0; i < vec[node].size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int graph_hub(int, std::vector<std::vector<int> >&, std::vector<std::vector<int> >&, std::vector<int>&)':
dreaming.cpp:66:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     for (int i = 0; i < vec[node].size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:92:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |         for (int i = 0; i < vec[0].size(); i++)
      |                         ~~^~~~~~~~~~~~~~~
dreaming.cpp:122:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 |     for (int i = 0; i < L.size(); i++)
      |                     ~~^~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 43 ms 17656 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 43 ms 17656 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 281 ms 10776 KB Output is correct
2 Correct 281 ms 10832 KB Output is correct
3 Correct 316 ms 10780 KB Output is correct
4 Correct 281 ms 10820 KB Output is correct
5 Correct 290 ms 10624 KB Output is correct
6 Correct 320 ms 11384 KB Output is correct
7 Correct 309 ms 11216 KB Output is correct
8 Correct 289 ms 10612 KB Output is correct
9 Correct 292 ms 10540 KB Output is correct
10 Correct 287 ms 10968 KB Output is correct
11 Correct 1 ms 504 KB Output is correct
12 Correct 413 ms 6476 KB Output is correct
13 Correct 427 ms 6604 KB Output is correct
14 Correct 451 ms 6472 KB Output is correct
15 Correct 480 ms 6608 KB Output is correct
16 Correct 438 ms 6456 KB Output is correct
17 Correct 445 ms 6600 KB Output is correct
18 Correct 493 ms 6552 KB Output is correct
19 Correct 432 ms 6344 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Incorrect 0 ms 348 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 43 ms 17656 KB Output isn't correct
2 Halted 0 ms 0 KB -