oj.uz

Submission #697557

# Submission time Handle Problem Language Result Execution time Memory
697557 2023-02-10T11:15:34 Z piOOE Newspapers (CEOI21_newspapers) C++17
0 / 100
 1 ms 212 KB 
#include <bits/stdc++.h>

using namespace std;

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

    int n, m;
    cin >> n >> m;

    vector<vector<int>> adj(n);

    for (int i = 0; i < m; ++i) {
        int x, y;
        cin >> x >> y;
        x -= 1, y -= 1;

        adj[x].push_back(y);
        adj[y].push_back(x);
    }

    auto bfs = [&](int source) {
        vector<int> dist(n, -1), par(n, -1);
        dist[source] = 0;

        queue<int> q;
        q.push(source);

        while (!q.empty()) {
            int v = q.front();
            q.pop();

            if (dist[v] > 3) {
                break;
            }

            for (int to : adj[v]) {
                if (to != par[v] && dist[to] < dist[v] + 1) {
                    dist[to] = dist[v] + 1;
                    q.push(to);
                    par[to] = v;
                }
            }
        }

        return dist;
    };

    auto tmp = bfs(0);

    int d = max_element(tmp.begin(), tmp.end()) - tmp.begin();

    auto dist = bfs(d);

    if (*max_element(dist.begin(), dist.end()) > 3) {
        cout << "NO\n";
        return 0;
    }

    cout << "YES\n";

    cout << "1\n1\n";

    return 0;
}

Subtask #1
0.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Partially correct 0 ms 212 KB Failed to provide a successful strategy.
3 Incorrect 1 ms 212 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Partially correct 0 ms 212 KB Failed to provide a successful strategy.
3 Partially correct 0 ms 212 KB Failed to provide a successful strategy.
4 Partially correct 0 ms 212 KB Failed to provide a successful strategy.
5 Incorrect 1 ms 212 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #3
0.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Partially correct 0 ms 212 KB Failed to provide a successful strategy.
3 Incorrect 1 ms 212 KB Output isn't correct
4 Halted 0 ms 0 KB -