oj.uz

Submission #930778

# Submission time Handle Problem Language Result Execution time Memory
930778 2024-02-20T12:06:58 Z LucaIlie Spring cleaning (CEOI20_cleaning) C++17
28 / 100
 1000 ms 14672 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 1e5;
int leafs[MAX_N + 1], parent[MAX_N + 1], children[MAX_N + 1], a[MAX_N + 1];
vector<int> adj[MAX_N + 1];
int ans;

void dfs( int u, int p ) {
    parent[u] = p;
    for ( int v: adj[u] ) {
        if ( v == p )
            continue;
        children[u]++;
        dfs( v, u );
        leafs[u] += leafs[v];
    }
    leafs[u] += (children[u] == 0);
    ans += 2 - leafs[u] % 2;
}

int main() {
    int n, q;

    cin >> n >> q;
    for ( int i = 0; i < n - 1; i++ ) {
        int u, v;
        cin >> u >> v;
        adj[u].push_back( v );
        adj[v].push_back( u );
    }

    int r = 1;
    while ( adj[r].size() == 1 )
        r++;
    ans = 0;
    dfs( r, 0 );

    for ( int i = 0; i < q; i++ ) {
        int d;
        int change = 0;

        cin >> d;
        for ( int i = 0; i < d; i++ ) {
            cin >> a[i];
            int v = a[i];
            change++;
            if ( children[v] == 0 ) {
                children[v]++;
                continue;
            }
            while ( v != 0 ) {
                change -= 2 - leafs[v] % 2;
                leafs[v]++;
                change += 2 - leafs[v] % 2;
                v = parent[v];
            }
        }

        change -= 2 - leafs[r] % 2;
        cout << (leafs[r] % 2 == 0 ? ans + change : -1) << "\n";

        for ( int i = 0; i < d; i++ ) {
            int v = a[i];
            if ( children[v] == 1 ) {
                children[v]--;
                continue;
            }
            while ( v != 0 ) {
                leafs[v]--;
                v = parent[v];
            }
        }
    }


    return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Incorrect 41 ms 3676 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 3160 KB Output is correct
2 Correct 19 ms 3160 KB Output is correct
3 Correct 40 ms 7340 KB Output is correct
4 Correct 47 ms 6352 KB Output is correct
5 Correct 59 ms 7648 KB Output is correct

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 852 ms 3932 KB Output is correct
2 Correct 835 ms 3912 KB Output is correct
3 Correct 310 ms 14672 KB Output is correct
4 Execution timed out 1041 ms 13724 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1025 ms 4184 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 137 ms 5688 KB Output is correct
2 Correct 72 ms 5496 KB Output is correct
3 Correct 56 ms 4184 KB Output is correct
4 Correct 72 ms 5468 KB Output is correct
5 Correct 72 ms 5456 KB Output is correct

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 231 ms 7612 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Incorrect 41 ms 3676 KB Output isn't correct
3 Halted 0 ms 0 KB -