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Submission #680710

# Submission time Handle Problem Language Result Execution time Memory
680710 2023-01-11T15:48:28 Z speedyArda Dreaming (IOI13_dreaming) C++14
18 / 100
 64 ms 14664 KB 
#include "dreaming.h"
#include "bits/stdc++.h"
#define pb push_back
#define pii pair<int, int>
using namespace std;
using ll = long long;
const int MAXN = 100005;
vector<vector<pair<int, int> > > adj(MAXN);
bool vis[MAXN];
pair<ll, int> down[MAXN][2];
void dfs_down(int v, int p)
{
    vis[v] = true;
    down[v][0].second = down[v][1].second = -1;

    //cout << v << "\n";
    for(pii e : adj[v])
    {
        //cout << e.first << " " << e.second << "\n";
        if(e.first == p)
            continue;
        dfs_down(e.first, v);
        ll val = down[e.first][0].first + e.second;
        if(down[v][0].first < val)
        {
            down[v][0].first = val;
            down[v][0].second = e.first;
        } else if(down[v][1].first < val)
        {
            down[v][1].first = val;
            down[v][1].second = e.first;
        }
    }

    //cout << v << " " << down[v] << "\n";
}
pair<ll, int> dfs_up(int v, int p, ll top)
{
    vis[v] = true;
    pair<ll, int> curr = {max(top, down[v][0].first), v};
    if(down[v][0].second != -1)
    {
        pii e;
        for(pii tmp : adj[v])
        {
            if(down[v][0].second == tmp.first)
                e = tmp;

        }

        pair<ll, int> temp = dfs_up(down[v][0].second, v, max(top, down[v][1].first) + e.second);
        if(curr.first > temp.first)
            curr = temp;
    }


    return curr;
}

void dfs_check(int v, int p)
{
    vis[v] = true;
    for(pii e : adj[v])
    {
        if(e.first == p)
            continue;
        dfs_check(e.first, v);
    }
}

ll ans = 0;
ll dfs_long(int v, int p)
{
    ll max_temp = 0, max_1 = 0;

    for(pii e : adj[v])
    {
        if(e.first == p)
            continue;
        ll temp = dfs_long(e.first, v) + e.second;
        max_temp = max(max_temp, max_1 + temp);
        max_1 = max(max_1, temp);
    }
    
    ans = max(ans, max_temp);
    return max_1;
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    
    for(int i = 0; i < M; i++)
    {
        adj[A[i]].pb({B[i], T[i]});
        adj[B[i]].pb({A[i], T[i]});
    }
    for(int i = 0; i < N; i++)
    {
        //cout << i << "\n";
        if(!vis[i])
            dfs_down(i, -1);
        //cout << i << "\n";
    }    

    for(int i = 0; i < N; i++)
        vis[i] = false;
    vector< pair<ll, int> > root_nodes;
    for(int i = 0; i < N; i++)
    {
        if(!vis[i])
        {
            
            //cout << i << "\n";
            pair<ll, int> temp = dfs_up(i, -1, 0);
            dfs_check(i, -1);
            //cout << i << " " << temp.first << " " << temp.second << "\n";
            root_nodes.pb(temp);
        }
    }

    sort(root_nodes.begin(), root_nodes.end());
    reverse(root_nodes.begin(), root_nodes.end());
    int from = root_nodes[0].second;
    //cout << root_nodes.size() << "\n";
    for(int i = 1; i < root_nodes.size(); i++)
    {
        int to = root_nodes[i].second;
        adj[from].pb({to, L});
        adj[to].pb({from, L});
        //cout << from << " " << to << "\n";
    }

    dfs_long(0, -1);
    return ans;

}

Compilation message

dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:124:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |     for(int i = 1; i < root_nodes.size(); i++)
      |                    ~~^~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 14664 KB Output is correct
2 Correct 45 ms 14356 KB Output is correct
3 Correct 33 ms 12084 KB Output is correct
4 Correct 8 ms 4436 KB Output is correct
5 Correct 6 ms 3808 KB Output is correct
6 Correct 12 ms 5332 KB Output is correct
7 Incorrect 2 ms 2644 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Incorrect 2 ms 2672 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 14664 KB Output is correct
2 Correct 45 ms 14356 KB Output is correct
3 Correct 33 ms 12084 KB Output is correct
4 Correct 8 ms 4436 KB Output is correct
5 Correct 6 ms 3808 KB Output is correct
6 Correct 12 ms 5332 KB Output is correct
7 Incorrect 2 ms 2644 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 10852 KB Output is correct
2 Correct 36 ms 10896 KB Output is correct
3 Correct 33 ms 10832 KB Output is correct
4 Correct 38 ms 10884 KB Output is correct
5 Correct 33 ms 10820 KB Output is correct
6 Correct 39 ms 11844 KB Output is correct
7 Correct 41 ms 11160 KB Output is correct
8 Correct 53 ms 10736 KB Output is correct
9 Correct 30 ms 10584 KB Output is correct
10 Correct 37 ms 11184 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 25 ms 11360 KB Output is correct
13 Correct 21 ms 11360 KB Output is correct
14 Correct 21 ms 11324 KB Output is correct
15 Correct 20 ms 11332 KB Output is correct
16 Correct 23 ms 11328 KB Output is correct
17 Correct 25 ms 11320 KB Output is correct
18 Correct 21 ms 11360 KB Output is correct
19 Correct 26 ms 11264 KB Output is correct
20 Correct 2 ms 2644 KB Output is correct
21 Correct 2 ms 2664 KB Output is correct
22 Correct 2 ms 2932 KB Output is correct
23 Correct 20 ms 11308 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Incorrect 2 ms 2672 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 14664 KB Output is correct
2 Correct 45 ms 14356 KB Output is correct
3 Correct 33 ms 12084 KB Output is correct
4 Correct 8 ms 4436 KB Output is correct
5 Correct 6 ms 3808 KB Output is correct
6 Correct 12 ms 5332 KB Output is correct
7 Incorrect 2 ms 2644 KB Output isn't correct
8 Halted 0 ms 0 KB -