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Submission #736418

# Submission time Handle Problem Language Result Execution time Memory
736418 2023-05-05T15:15:21 Z hollwo_pelw The Xana coup (BOI21_xanadu) C++17
100 / 100
 68 ms 18432 KB 
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/trie_policy.hpp>
// #include <ext/rope>

using namespace std;
// using namespace __gnu_cxx;
// using namespace __gnu_pbds;

void Hollwo_Pelw();

signed main(){
#ifndef hollwo_pelw_local
	if (fopen(".inp", "r"))
		assert(freopen(".inp", "r", stdin)), assert(freopen(".out", "w", stdout));
#else
	using namespace chrono;
	auto start = steady_clock::now();
#endif
	cin.tie(0), cout.tie(0) -> sync_with_stdio(0);
	int testcases = 1;
	// cin >> testcases;
	for (int test = 1; test <= testcases; test++){
		// cout << "Case #" << test << ": ";
		Hollwo_Pelw();
	}
#ifdef hollwo_pelw_local
	auto end = steady_clock::now();
	cout << "\nExecution time : " << duration_cast<milliseconds> (end - start).count() << "[ms]" << endl;
#endif
}

const int N = 1e5 + 5, inf = 1e9;

int n, a[N], dp[N][2][2];
vector<int> adj[N];

void dfs(int u, int p) {
	for (int i = 0; i < 2; i++)
		dp[u][i][a[u] ^ i] = i;

	for (int v : adj[u]) if (v != p) {
		dfs(v, u);
		for (int i = 0; i < 2; i++) {
			int dpu0 = dp[u][i][0], dpu1 = dp[u][i][1];
			dp[u][i][0] = min({dpu0 + dp[v][0][i], dpu1 + dp[v][1][i], inf});
			dp[u][i][1] = min({dpu0 + dp[v][1][i], dpu1 + dp[v][0][i], inf});
		}
	}
}

void Hollwo_Pelw(){
	memset(dp, 0x3f, sizeof dp);
	cin >> n;
	for (int i = 1, u, v; i < n; i++) {
		cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	for (int i = 1; i <= n; i++)
		cin >> a[i];
	dfs(1, 0);
	int res = min(dp[1][0][0], dp[1][1][0]);
	if (res > n)
		cout << "impossible\n";
	else
		cout << res << '\n';
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4180 KB Output is correct
2 Correct 2 ms 4180 KB Output is correct
3 Correct 2 ms 4240 KB Output is correct
4 Correct 2 ms 4180 KB Output is correct
5 Correct 3 ms 4236 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4180 KB Output is correct
2 Correct 2 ms 4180 KB Output is correct
3 Correct 2 ms 4240 KB Output is correct
4 Correct 2 ms 4180 KB Output is correct
5 Correct 3 ms 4236 KB Output is correct
6 Correct 3 ms 4144 KB Output is correct
7 Correct 2 ms 4240 KB Output is correct
8 Correct 2 ms 4180 KB Output is correct
9 Correct 2 ms 4240 KB Output is correct
10 Correct 3 ms 4240 KB Output is correct
11 Correct 3 ms 4180 KB Output is correct
12 Correct 3 ms 4180 KB Output is correct
13 Correct 3 ms 4180 KB Output is correct
14 Correct 3 ms 4180 KB Output is correct
15 Correct 3 ms 4240 KB Output is correct
16 Correct 3 ms 4236 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 18332 KB Output is correct
2 Correct 49 ms 18212 KB Output is correct
3 Correct 67 ms 18432 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 18348 KB Output is correct
2 Correct 67 ms 18252 KB Output is correct
3 Correct 63 ms 18380 KB Output is correct
4 Correct 60 ms 8564 KB Output is correct
5 Correct 46 ms 8908 KB Output is correct
6 Correct 68 ms 9188 KB Output is correct
7 Correct 3 ms 4180 KB Output is correct
8 Correct 16 ms 5832 KB Output is correct
9 Correct 58 ms 9136 KB Output is correct
10 Correct 51 ms 9096 KB Output is correct
11 Correct 48 ms 9696 KB Output is correct
12 Correct 50 ms 9888 KB Output is correct
13 Correct 42 ms 8780 KB Output is correct
14 Correct 58 ms 9036 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4180 KB Output is correct
2 Correct 2 ms 4180 KB Output is correct
3 Correct 2 ms 4240 KB Output is correct
4 Correct 2 ms 4180 KB Output is correct
5 Correct 3 ms 4236 KB Output is correct
6 Correct 3 ms 4144 KB Output is correct
7 Correct 2 ms 4240 KB Output is correct
8 Correct 2 ms 4180 KB Output is correct
9 Correct 2 ms 4240 KB Output is correct
10 Correct 3 ms 4240 KB Output is correct
11 Correct 3 ms 4180 KB Output is correct
12 Correct 3 ms 4180 KB Output is correct
13 Correct 3 ms 4180 KB Output is correct
14 Correct 3 ms 4180 KB Output is correct
15 Correct 3 ms 4240 KB Output is correct
16 Correct 3 ms 4236 KB Output is correct
17 Correct 57 ms 18332 KB Output is correct
18 Correct 49 ms 18212 KB Output is correct
19 Correct 67 ms 18432 KB Output is correct
20 Correct 57 ms 18348 KB Output is correct
21 Correct 67 ms 18252 KB Output is correct
22 Correct 63 ms 18380 KB Output is correct
23 Correct 60 ms 8564 KB Output is correct
24 Correct 46 ms 8908 KB Output is correct
25 Correct 68 ms 9188 KB Output is correct
26 Correct 3 ms 4180 KB Output is correct
27 Correct 16 ms 5832 KB Output is correct
28 Correct 58 ms 9136 KB Output is correct
29 Correct 51 ms 9096 KB Output is correct
30 Correct 48 ms 9696 KB Output is correct
31 Correct 50 ms 9888 KB Output is correct
32 Correct 42 ms 8780 KB Output is correct
33 Correct 58 ms 9036 KB Output is correct
34 Correct 2 ms 4180 KB Output is correct
35 Correct 2 ms 4236 KB Output is correct
36 Correct 2 ms 4180 KB Output is correct
37 Correct 2 ms 4180 KB Output is correct
38 Correct 2 ms 4180 KB Output is correct
39 Correct 3 ms 4244 KB Output is correct
40 Correct 3 ms 4216 KB Output is correct
41 Correct 3 ms 4180 KB Output is correct
42 Correct 2 ms 4180 KB Output is correct
43 Correct 2 ms 4240 KB Output is correct
44 Correct 2 ms 4180 KB Output is correct
45 Correct 64 ms 18380 KB Output is correct
46 Correct 44 ms 18124 KB Output is correct
47 Correct 49 ms 18432 KB Output is correct
48 Correct 39 ms 8456 KB Output is correct
49 Correct 47 ms 8992 KB Output is correct
50 Correct 50 ms 9072 KB Output is correct
51 Correct 3 ms 4180 KB Output is correct
52 Correct 16 ms 5808 KB Output is correct
53 Correct 48 ms 9100 KB Output is correct
54 Correct 46 ms 9196 KB Output is correct
55 Correct 59 ms 9640 KB Output is correct
56 Correct 53 ms 9964 KB Output is correct
57 Correct 41 ms 8740 KB Output is correct
58 Correct 59 ms 9084 KB Output is correct
59 Correct 16 ms 5844 KB Output is correct
60 Correct 43 ms 8620 KB Output is correct
61 Correct 55 ms 9036 KB Output is correct
62 Correct 56 ms 9080 KB Output is correct
63 Correct 48 ms 9164 KB Output is correct
64 Correct 50 ms 9192 KB Output is correct
65 Correct 63 ms 9584 KB Output is correct
66 Correct 48 ms 9600 KB Output is correct
67 Correct 41 ms 9440 KB Output is correct
68 Correct 36 ms 9412 KB Output is correct
69 Correct 35 ms 9516 KB Output is correct
70 Correct 36 ms 9488 KB Output is correct