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Submission #782543

# Submission time Handle Problem Language Result Execution time Memory
782543 2023-07-14T04:42:30 Z t6twotwo Spring cleaning (CEOI20_cleaning) C++17
18 / 100
 1000 ms 262144 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N, Q;
    cin >> N >> Q;
    vector<vector<int>> adj(N);
    for (int i = 0; i < N - 1; i++) {
        int x, y;
        cin >> x >> y;
        x--, y--;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    while (Q--) {
        int D;
        cin >> D;
        for (int i = 0; i < D; i++) {
            int p;
            cin >> p; p--;
            adj.push_back({p});
            adj[p].push_back(N + i);
        }
        int leaves = 0;
        for (int i = 0; i < N + D; i++) {
            leaves += adj[i].size() == 1;
        }
        if (leaves % 2 == 1) {
            cout << -1 << "\n";
        } else {
            int ans = 0;
            auto dfs = [&](auto dfs, int x, int p) -> int {
                int s = adj[x].size() == 1;
                for (int y : adj[x]) {
                    if (y == p) {
                        continue;
                    }
                    int t = dfs(dfs, y, x);
                    ans += 2 - t % 2;
                    s += t;
                }
                return s;
            };
            dfs(dfs, 0, -1);
            cout << ans << "\n";
        }
        adj.resize(N);
        for (int i = 0; i < N; i++) {
            if (adj[i].back() >= N) {
                adj[i].pop_back();
            }
        }
    }
    return 6/22;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Execution timed out 1088 ms 4232 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 5644 KB Output is correct
2 Correct 11 ms 5664 KB Output is correct
3 Correct 20 ms 9228 KB Output is correct
4 Correct 34 ms 12640 KB Output is correct
5 Correct 40 ms 12380 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 7396 KB Output is correct
2 Correct 12 ms 7524 KB Output is correct
3 Correct 40 ms 10460 KB Output is correct
4 Correct 43 ms 14860 KB Output is correct
5 Correct 26 ms 9352 KB Output is correct

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Runtime error 191 ms 262144 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #5
0 / 19.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1078 ms 6412 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1053 ms 9548 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Execution timed out 1088 ms 4232 KB Time limit exceeded
3 Halted 0 ms 0 KB -