oj.uz

답안 #461432

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
461432 2021-08-10T02:01:21 Z kiennguyen246 경주 (Race) (IOI11_race) C++14
9 / 100
 3000 ms 14980 KB 
/**
 * \author Nguyen Duc Kien
 * \date ./08/2021
 */

///Task name
#define TASK ""

///-------------------------------------------///

#include <bits/stdc++.h>

using namespace std;

const int maxn = 2e5 + 5;
const int maxnn = 1e6 + 5;

int n, k, res;
vector <pair <int, int> > G[maxn];

namespace BF
{
    void DFS(int u, int d, int l, int par = 0)
    {
        if (l > k) return;
        if (l == k) res = min(res, d);
        for (auto p : G[u])
        {
            int v = p.first;
            int w = p.second;
            if (v == par) continue;
            DFS(v, d + 1, l + w, u);
        }

    }

    void Main()
    {
        for (int i = 1; i <= n; i ++) DFS(i, 0, 0);
    }
}

namespace Centroid
{
    int sz[maxn], mpath[maxnn];
    bool mk[maxn];

    void DFS_sz(int u, int par = 0)
    {
        sz[u] = 1;
        for (auto p : G[u])
        {
            int v = p.first;
            if (v == par || mk[v]) continue;
            DFS_sz(v, u);
            sz[u] += sz[v];
        }
    }

    void DFS_mpath(int u, int d, long long l, int par, int com)
    {
        if (l > k) return;
        if (com == 0)
        {
            res = min(res, d + mpath[k - l]);
        }
        else if (com == 1)
        {
            mpath[l] = min(mpath[l], d);
        }
        else if (com == -1)
        {
            mpath[l] = 1e9 + 69;
        }
        for (auto p : G[u])
        {
            int v = p.first;
            int w = p.second;
            if (v == par || mk[v]) continue;
            DFS_mpath(v, d + 1, l + w, u, com);
        }
    }

    int GetCentroid(int u, int msz, int par = 0)
    {
        for (auto p : G[u])
        {
            int v = p.first;
            if (v == par || mk[v]) continue;
            if (sz[v] * 2 > sz[u]) return GetCentroid(v, msz, u);
        }
        return u;
    }

    void Centroid(int u)
    {
        DFS_sz(u);
        int cent = GetCentroid(u, sz[u]);
        mk[cent] = 1;
        for (auto p : G[cent])
        {
            int v = p.first;
            int w = p.second;
            if (mk[v]) continue;
            DFS_mpath(v, 1, w, cent, 0);
            DFS_mpath(v, 1, w, cent, 1);
        }
        if (mpath[k]) res = min(res, mpath[k]);
        for (auto p : G[cent])
        {
            int v = p.first;
            int w = p.first;
            if (mk[v]) continue;
            DFS_mpath(v, 1, w, cent, -1);
        }
        for (auto p : G[cent])
        {
            int v = p.first;
            if (mk[v]) continue;
            Centroid(v);
        }
    }

    void Init()
    {
        fill(mpath + 1, mpath + 1000001, 1e9 + 69);
        res = 1e9 + 69;
    }
}

int best_path(int __n, int __k, int __h[][2], int __l[])
{
    n = __n, k = __k;
    for (int i = 1; i < n; i ++)
    {
        int u = __h[i][0] + 1;
        int v = __h[i][1] + 1;
        int w = __l[i];
        G[u].push_back({v, w});
        G[v].push_back({u, w});
    }
    Centroid::Init();
//    Centroid::Centroid(1);
    BF::Main();
    return (res == 1e9 + 69 ? -1 : res);

}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 8908 KB Output is correct
2 Correct 5 ms 8844 KB Output is correct
3 Correct 5 ms 8908 KB Output is correct
4 Correct 5 ms 8908 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 5 ms 8840 KB Output is correct
7 Correct 5 ms 8908 KB Output is correct
8 Correct 5 ms 8908 KB Output is correct
9 Correct 5 ms 8908 KB Output is correct
10 Correct 5 ms 8908 KB Output is correct
11 Correct 5 ms 8908 KB Output is correct
12 Correct 6 ms 8908 KB Output is correct
13 Correct 5 ms 8908 KB Output is correct
14 Correct 5 ms 8832 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 5 ms 8840 KB Output is correct
17 Correct 6 ms 8840 KB Output is correct
18 Correct 6 ms 8908 KB Output is correct

Subtask #2
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 8908 KB Output is correct
2 Correct 5 ms 8844 KB Output is correct
3 Correct 5 ms 8908 KB Output is correct
4 Correct 5 ms 8908 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 5 ms 8840 KB Output is correct
7 Correct 5 ms 8908 KB Output is correct
8 Correct 5 ms 8908 KB Output is correct
9 Correct 5 ms 8908 KB Output is correct
10 Correct 5 ms 8908 KB Output is correct
11 Correct 5 ms 8908 KB Output is correct
12 Correct 6 ms 8908 KB Output is correct
13 Correct 5 ms 8908 KB Output is correct
14 Correct 5 ms 8832 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 5 ms 8840 KB Output is correct
17 Correct 6 ms 8840 KB Output is correct
18 Correct 6 ms 8908 KB Output is correct
19 Correct 5 ms 8908 KB Output is correct
20 Correct 5 ms 8908 KB Output is correct
21 Incorrect 16 ms 8976 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 8908 KB Output is correct
2 Correct 5 ms 8844 KB Output is correct
3 Correct 5 ms 8908 KB Output is correct
4 Correct 5 ms 8908 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 5 ms 8840 KB Output is correct
7 Correct 5 ms 8908 KB Output is correct
8 Correct 5 ms 8908 KB Output is correct
9 Correct 5 ms 8908 KB Output is correct
10 Correct 5 ms 8908 KB Output is correct
11 Correct 5 ms 8908 KB Output is correct
12 Correct 6 ms 8908 KB Output is correct
13 Correct 5 ms 8908 KB Output is correct
14 Correct 5 ms 8832 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 5 ms 8840 KB Output is correct
17 Correct 6 ms 8840 KB Output is correct
18 Correct 6 ms 8908 KB Output is correct
19 Execution timed out 3073 ms 14980 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 8908 KB Output is correct
2 Correct 5 ms 8844 KB Output is correct
3 Correct 5 ms 8908 KB Output is correct
4 Correct 5 ms 8908 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 5 ms 8840 KB Output is correct
7 Correct 5 ms 8908 KB Output is correct
8 Correct 5 ms 8908 KB Output is correct
9 Correct 5 ms 8908 KB Output is correct
10 Correct 5 ms 8908 KB Output is correct
11 Correct 5 ms 8908 KB Output is correct
12 Correct 6 ms 8908 KB Output is correct
13 Correct 5 ms 8908 KB Output is correct
14 Correct 5 ms 8832 KB Output is correct
15 Correct 5 ms 8908 KB Output is correct
16 Correct 5 ms 8840 KB Output is correct
17 Correct 6 ms 8840 KB Output is correct
18 Correct 6 ms 8908 KB Output is correct
19 Correct 5 ms 8908 KB Output is correct
20 Correct 5 ms 8908 KB Output is correct
21 Incorrect 16 ms 8976 KB Output isn't correct
22 Halted 0 ms 0 KB -