oj.uz

Submission #977404

# Submission time Handle Problem Language Result Execution time Memory
977404 2024-05-07T21:34:39 Z OAleksa Spring cleaning (CEOI20_cleaning) C++14
34 / 100
 1000 ms 27740 KB 
#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;
const int N = 4e5 + 69;
int n, q, ch[N], par[N];
vector<int> g[N];
void dfs(int v, int p) {
	par[v] = p;
	for (auto u : g[v]) {
		if (u == p)
			continue;
		dfs(u, v);
	}
}
signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> q;
	for (int i = 1;i <= n - 1;i++) {
		int a, b;
		cin >> a >> b;
		g[a].push_back(b);
		g[b].push_back(a);
	}
	dfs(1, 0);
	while (q--) {
		int t;
		cin >> t;
		int a[t];
		for (int i = 0;i < t;i++) {
			cin >> a[i];
			g[a[i]].push_back(n + i + 1);
			g[n + i + 1].push_back(a[i]);
		}
		function<void(int, int)> calc = [&](int v, int p) {
			if (g[v].size() == 1)
				ch[v] = 1;
			else
				ch[v] = 0;
			for (auto u : g[v]) {
				if (u == p)
					continue;
				calc(u, v);
				ch[v] += ch[u];
			}
		};
		calc(1, 0);
		int uk = 0;
		for (int i = 1;i <= n + t;i++) 
			uk += (g[i].size() == 1);
		if (uk % 2 == 1)
			cout << "-1\n";
		else {
			int ans = 0;
			for (int i = 2;i <= n + t;i++)
				ans += (ch[i] % 2 == 0 ? 2 : 1);
			cout << ans << '\n';
		}
		for (int i = 0;i < t;i++) {
			g[a[i]].pop_back();
			assert(g[n + i + 1].size() == 1);
			g[n + i + 1].pop_back();
		}
	}
	return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12892 KB Output is correct
2 Execution timed out 1082 ms 13852 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 16216 KB Output is correct
2 Correct 18 ms 16708 KB Output is correct
3 Correct 22 ms 17260 KB Output is correct
4 Correct 47 ms 19532 KB Output is correct
5 Correct 46 ms 20684 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 16728 KB Output is correct
2 Correct 16 ms 16732 KB Output is correct
3 Correct 38 ms 25176 KB Output is correct
4 Correct 53 ms 27740 KB Output is correct
5 Correct 35 ms 25180 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 206 ms 14688 KB Output is correct
2 Correct 129 ms 13912 KB Output is correct
3 Correct 195 ms 13660 KB Output is correct
4 Correct 219 ms 14424 KB Output is correct
5 Correct 201 ms 14684 KB Output is correct
6 Correct 234 ms 14680 KB Output is correct

Subtask #5
0 / 19.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1057 ms 14940 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 1016 ms 15952 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 12892 KB Output is correct
2 Execution timed out 1082 ms 13852 KB Time limit exceeded
3 Halted 0 ms 0 KB -