oj.uz

Submission #556685

# Submission time Handle Problem Language Result Execution time Memory
556685 2022-05-03T15:59:02 Z hoanghq2004 Spring cleaning (CEOI20_cleaning) C++14
16 / 100
 1000 ms 30168 KB 
#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

const int N = 1e5 + 10;

int n, q, ans;
set <int> g[N];
int sz[N];

void dfs(int u, int p) {
    if (g[u].size() <= 1 && p) {
        sz[u] = 1;
        return;
    }
    sz[u] = 0;
    for (auto v: g[u]) {
        if (v == p) continue;
        dfs(v, u);
        sz[u] += sz[v];
        ans += (sz[v] % 2 ? 1 : 2);
    }
}

void solve() {
    int m;
    cin >> m;
    for (int i = 1; i <= m; ++i) {
        int u;
        cin >> u;
        g[u].insert(i + n);
        g[i + n].insert(u);
    }
    int leaves = 0;
    for (int i = 1; i <= n + m; ++i)
        if (g[i].size() <= 1) ++leaves;
    if (leaves % 2 == 0) {
        dfs(1, 0);
        cout << ans << '\n';
    } else cout << -1 << '\n';

    for (int u = n + 1; u <= n + m; ++u) {
        for (auto v: g[u]) g[v].erase(u);
        g[u].clear();
    }
    ans = 0;
}

int main() {
    ios :: sync_with_stdio(0); cin.tie(0);
    cin >> n >> q;
    for (int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        g[u].insert(v);
        g[v].insert(u);
    }
    while (q--) solve();
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Execution timed out 1086 ms 7852 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 13508 KB Output is correct
2 Correct 44 ms 13188 KB Output is correct
3 Runtime error 81 ms 29740 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 14136 KB Output is correct
2 Correct 59 ms 13412 KB Output is correct
3 Runtime error 75 ms 30168 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 332 ms 8456 KB Output is correct
2 Correct 258 ms 7728 KB Output is correct
3 Correct 180 ms 7172 KB Output is correct
4 Correct 16 ms 7640 KB Output is correct
5 Correct 301 ms 7924 KB Output is correct
6 Correct 387 ms 8352 KB Output is correct

Subtask #5
0 / 19.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1075 ms 12344 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 1085 ms 16068 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Execution timed out 1086 ms 7852 KB Time limit exceeded
3 Halted 0 ms 0 KB -