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답안 #962080

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
962080 2024-04-13T06:44:32 Z danikoynov 꿈 (IOI13_dreaming) C++14
0 / 100
 31 ms 17724 KB 
#include "dreaming.h"
#include<bits/stdc++.h>


using namespace std;
typedef long long ll;

const int maxn = 1e5 + 10;

vector < pair < int, int > > adj[maxn];

int used[maxn], depth[maxn];
int max_depth[maxn], sec[maxn];
void calc(int v, int p)
{
    max_depth[v] = 0;
    for (pair < int, int > nb : adj[v])
    {
        int u = nb.first;
        if (u == p)
            continue;
        depth[u] = depth[v] + nb.second;
        calc(u, v);
        int vl = max_depth[u] + nb.second;
        if (vl > max_depth[v])
        {
             sec[v] = max_depth[v];
             max_depth[v] = vl;
        }
        else
     if (vl > sec[v])
     {
          sec[v] = vl;
     }
        ///max_depth[v] = max(max_depth[v], max_depth[u] + nb.second);
    }
}
vector < int > ord;
void trav(int v, int p)
{
    ord.push_back(v);
    used[v] = 1;
    for (pair < int, int > nb : adj[v])
    {
        if (nb.first == p)
            continue;
        trav(nb.first, v);
    }
}

int dist;

void dfs(int v, int p, int lon)
{

    //cout << "dfs " << v << " " << p << " " << lon << endl;

    //cout << val << " " << sec << endl;
    dist = min(dist, max(lon, max_depth[v]));

    if (lon >= max_depth[v])
     return;

    for (pair < int, int > nb : adj[v])
    {
        int u = nb.first;
        if (u == p)
            continue;
        if (max_depth[u] + nb.second == max_depth[v])
        {
             dfs(u, v, max(lon, sec[v]) + nb.second);
             return;
        }
    }
}
int cap;

int path[maxn];
void bfs(int v)
{
    for (int w : ord)
        path[w] = -1;
    path[v] = 0;
    queue < int > q;
    q.push(v);
    while(!q.empty())
    {
        v = q.front();
        q.pop();
        for (pair <int, int > nb : adj[v])
        {
            if (path[nb.first] == -1)
            {
                path[nb.first] = path[v] + nb.second;
                q.push(nb.first);
            }
        }
    }
}
int find_distance(int v)
{
    ord.clear();
    trav(v, -1);
    dist = 2e9;
     calc(v, -1);
     dfs(v, -1, 0);

    bfs(v);
    int ds = v;
    for (int u : ord)
        if (path[u] > path[ds])
            ds = u;
    bfs(ds);
    for (int u : ord)
        if (path[u] > cap)
            cap = path[u];
    return dist;
}


int travelTime(int N, int M, int L, int A[], int B[], int T[])
{

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

    for (int i = 0; i < N; i ++)
    {
         assert(adj[i].size() <= 1);
    }
    
    //cout << find_distance(1) << endl;
    //exit(0);
    vector < int > values;
    for (int i = 0; i < N; i ++)
    {
        if (!used[i])
            values.push_back(find_distance(i));
    }


    //for (int cur : values)
    //cout << cur << " ";
    //cout << endl;
    sort(values.begin(), values.end());

    int sz = values.size();
    int res = values[sz - 1] + values[sz - 2] + L;

    if (sz >= 3)
        res = max(res, values[sz - 2] + values[sz - 3] + 2 * L);
    res = max(res, cap);
    return res;
}

Subtask #1
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 31 ms 17724 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 6 ms 11352 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 31 ms 17724 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 8208 KB Output is correct
2 Correct 20 ms 8160 KB Output is correct
3 Correct 20 ms 8080 KB Output is correct
4 Correct 27 ms 8156 KB Output is correct
5 Correct 18 ms 8152 KB Output is correct
6 Correct 19 ms 8540 KB Output is correct
7 Correct 20 ms 8284 KB Output is correct
8 Correct 24 ms 8312 KB Output is correct
9 Correct 18 ms 8152 KB Output is correct
10 Correct 25 ms 8488 KB Output is correct
11 Correct 1 ms 5724 KB Output is correct
12 Correct 10 ms 6360 KB Output is correct
13 Correct 11 ms 6360 KB Output is correct
14 Correct 10 ms 6356 KB Output is correct
15 Correct 12 ms 6356 KB Output is correct
16 Correct 13 ms 6360 KB Output is correct
17 Correct 10 ms 6360 KB Output is correct
18 Correct 10 ms 6424 KB Output is correct
19 Correct 10 ms 6360 KB Output is correct
20 Incorrect 2 ms 5724 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 6 ms 11352 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 31 ms 17724 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -