oj.uz

Submission #868975

# Submission time Handle Problem Language Result Execution time Memory
868975 2023-11-02T17:24:30 Z StefanL2005 Dreaming (IOI13_dreaming) C++14
0 / 100
 470 ms 16880 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;
    bool ok = false;
    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 && !ok)
        {
            path = i;
            ok = true;
            continue;
        }
        if (down_sum[vecin] + cost[node][i] > sum2)
            sum2 = down_sum[vecin] + cost[node][i];
    }

    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;
    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:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     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:63:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |     for (int i = 0; i < vec[node].size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:89:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |         for (int i = 0; i < vec[0].size(); i++)
      |                         ~~^~~~~~~~~~~~~~~
dreaming.cpp:119:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  119 |     for (int i = 0; i < L.size(); i++)
      |                     ~~^~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 42 ms 16880 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 42 ms 16880 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 278 ms 10348 KB Output is correct
2 Correct 291 ms 10532 KB Output is correct
3 Correct 289 ms 10212 KB Output is correct
4 Correct 272 ms 10160 KB Output is correct
5 Correct 277 ms 10136 KB Output is correct
6 Correct 303 ms 10932 KB Output is correct
7 Correct 321 ms 11040 KB Output is correct
8 Correct 259 ms 10180 KB Output is correct
9 Correct 267 ms 9960 KB Output is correct
10 Correct 316 ms 10572 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 447 ms 6600 KB Output is correct
13 Correct 443 ms 6344 KB Output is correct
14 Correct 470 ms 6612 KB Output is correct
15 Correct 443 ms 6472 KB Output is correct
16 Correct 441 ms 6212 KB Output is correct
17 Correct 434 ms 6440 KB Output is correct
18 Correct 438 ms 6348 KB Output is correct
19 Correct 445 ms 6464 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 42 ms 16880 KB Output isn't correct
2 Halted 0 ms 0 KB -