oj.uz

Submission #1024517

# Submission time Handle Problem Language Result Execution time Memory
1024517 2024-07-16T06:47:03 Z stdfloat Torrent (COI16_torrent) C++17
0 / 100
 2000 ms 20316 KB 
#include <bits/stdc++.h>
using namespace std;

using ll = long long;

vector<bool> vis;

vector<vector<int>> E;

int dfs(int x) {
    vis[x] = true;

    vector<int> v;
    for (auto i : E[x]) {
        if (!vis[i]) v.push_back(dfs(i));
    }

    sort(v.rbegin(), v.rend());

    int mx = 0;
    for (int i = 0; i < (int)v.size(); i++) mx = max(mx, v[i] + i + 1);

    return mx;
}

int main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);

    int n, a, b;
    cin >> n >> a >> b; a--; b--;

    E.assign(n, {});
    for (int i = 1; i < n; i++) {
        int x, y;
        cin >> x >> y;
        
        E[--x].push_back(--y);
        E[y].push_back(x);
    }

    int mn = INT_MAX;
    for (int i = 0; i < n; i++) {
        if (i == b) continue;
    
        vis.assign(n, false);
        vis[a] = vis[b] = vis[i] = true;
    
        int y = dfs(b);
        vis[i] = false;
        int x = dfs(a);

        mn = min(mn, max(x, y));
    }

    cout << mn;
}

Subtask #1
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 344 KB Output is correct
2 Incorrect 23 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 69.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2061 ms 20316 KB Time limit exceeded
2 Halted 0 ms 0 KB -