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Submission #927493

# Submission time Handle Problem Language Result Execution time Memory
927493 2024-02-15T02:02:59 Z 12345678 Spring cleaning (CEOI20_cleaning) C++17
34 / 100
 1000 ms 15560 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5;
int n, q, deg[nx], u, v, t, res, rt, cnt[nx];
vector<int> d[nx];

void dfs(int u, int p)
{
    if (d[u].size()==1&&cnt[u]<1) deg[u]++;
    for (auto v:d[u])
    {
        if (v==p) continue;
        dfs(v, u);
        res+=deg[v];
        deg[u]+=deg[v];
    }
    if (deg[u]>2) deg[u]=((deg[u]%2)==1)?1:2;
    //cout<<"here "<<u<<' '<<deg[u]<<' '<<res<<'\n';
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>q;
    for (int i=1; i<n; i++) cin>>u>>v, d[u].push_back(v), d[v].push_back(u);
    for (int i=1; i<=n; i++) if (d[i].size()>1) rt=i;
    while (q--)
    {
        for (int i=1; i<=n; i++) deg[i]=cnt[i]=0;
        cin>>t;
        for (int i=0; i<t; i++) cin>>u, deg[u]++, cnt[u]++;
        res=t;
        dfs(rt, rt);
        if ((deg[rt]%2)==0) cout<<res<<'\n';
        else cout<<-1<<'\n';
    }
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Execution timed out 1083 ms 4228 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3164 KB Output is correct
2 Correct 5 ms 3164 KB Output is correct
3 Correct 17 ms 7892 KB Output is correct
4 Correct 21 ms 6868 KB Output is correct
5 Correct 23 ms 8404 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 3676 KB Output is correct
2 Correct 6 ms 3932 KB Output is correct
3 Correct 28 ms 15560 KB Output is correct
4 Correct 33 ms 14676 KB Output is correct
5 Correct 25 ms 14164 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 181 ms 4688 KB Output is correct
2 Correct 110 ms 3932 KB Output is correct
3 Correct 188 ms 3816 KB Output is correct
4 Correct 201 ms 4184 KB Output is correct
5 Correct 167 ms 4184 KB Output is correct
6 Correct 199 ms 4656 KB Output is correct

Subtask #5
0 / 19.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1036 ms 6492 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 1027 ms 8016 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 2652 KB Output is correct
2 Execution timed out 1083 ms 4228 KB Time limit exceeded
3 Halted 0 ms 0 KB -