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Submission #404004

# Submission time Handle Problem Language Result Execution time Memory
404004 2021-05-13T16:44:09 Z Nordway The Xana coup (BOI21_xanadu) C++17
100 / 100
 151 ms 15096 KB 
#include <iostream>
#include <vector>
#define pb push_back

using namespace std;

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

bool turned[N];

vector <int> g[N];

int dp[N][2][2], tmp[2][2];

void dfs(int v, int p) {
	for (int to : g[v]) {
		if (to != p) {
			dfs(to, v);
		}
	}
	dp[v][turned[v]][0] = 0;
	dp[v][turned[v]][1] = inf;
	dp[v][1 ^ turned[v]][1] = 1;
	dp[v][1 ^ turned[v]][0] = inf;
	for (int to : g[v]) {
		if (to != p) {
			tmp[0][0] = min(tmp[0][0], dp[v][0][0] + dp[to][0][0]);
			tmp[0][0] = min(tmp[0][0], dp[v][1][0] + dp[to][0][1]);
			tmp[0][1] = min(tmp[0][1], dp[v][0][1] + dp[to][1][0]);
			tmp[0][1] = min(tmp[0][1], dp[v][1][1] + dp[to][1][1]);
			tmp[1][0] = min(tmp[1][0], dp[v][0][0] + dp[to][0][1]);
			tmp[1][0] = min(tmp[1][0], dp[v][1][0] + dp[to][0][0]);
			tmp[1][1] = min(tmp[1][1], dp[v][0][1] + dp[to][1][1]);
			tmp[1][1] = min(tmp[1][1], dp[v][1][1] + dp[to][1][0]);
			for (int i = 0; i < 2; i++) {
				for (int j = 0; j < 2; j++) {
					dp[v][i][j] = tmp[i][j];
					tmp[i][j] = inf;
				}
			}
		}
	}
}

int main(){
	int n;
	cin >> n;

	for (int i = 1; i < n; i++) {
		int u, v;
		cin >> u >> v;
		g[u].pb(v);
		g[v].pb(u);
	}

	for (int i = 1; i <= n; i++) {
		cin >> turned[i];
	}

	for (int i : {0, 1}) {
		for (int j : {0, 1}) {
			tmp[i][j] = inf;
		}
	}

	dfs(1, 1);

	int ans = min(dp[1][0][0], dp[1][0][1]);
	if (ans == inf) cout << "impossible";
	else cout << ans;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2640 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2640 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 2 ms 2636 KB Output is correct
7 Correct 3 ms 2636 KB Output is correct
8 Correct 3 ms 2636 KB Output is correct
9 Correct 2 ms 2636 KB Output is correct
10 Correct 2 ms 2636 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 3 ms 2640 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2636 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 151 ms 14900 KB Output is correct
2 Correct 123 ms 14780 KB Output is correct
3 Correct 124 ms 14948 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 14928 KB Output is correct
2 Correct 147 ms 14744 KB Output is correct
3 Correct 122 ms 15096 KB Output is correct
4 Correct 102 ms 8052 KB Output is correct
5 Correct 118 ms 8616 KB Output is correct
6 Correct 122 ms 8696 KB Output is correct
7 Correct 3 ms 2648 KB Output is correct
8 Correct 36 ms 4692 KB Output is correct
9 Correct 122 ms 8772 KB Output is correct
10 Correct 148 ms 8876 KB Output is correct
11 Correct 127 ms 9156 KB Output is correct
12 Correct 120 ms 9340 KB Output is correct
13 Correct 113 ms 8304 KB Output is correct
14 Correct 123 ms 8760 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2640 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 2 ms 2636 KB Output is correct
7 Correct 3 ms 2636 KB Output is correct
8 Correct 3 ms 2636 KB Output is correct
9 Correct 2 ms 2636 KB Output is correct
10 Correct 2 ms 2636 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 3 ms 2640 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2636 KB Output is correct
17 Correct 151 ms 14900 KB Output is correct
18 Correct 123 ms 14780 KB Output is correct
19 Correct 124 ms 14948 KB Output is correct
20 Correct 134 ms 14928 KB Output is correct
21 Correct 147 ms 14744 KB Output is correct
22 Correct 122 ms 15096 KB Output is correct
23 Correct 102 ms 8052 KB Output is correct
24 Correct 118 ms 8616 KB Output is correct
25 Correct 122 ms 8696 KB Output is correct
26 Correct 3 ms 2648 KB Output is correct
27 Correct 36 ms 4692 KB Output is correct
28 Correct 122 ms 8772 KB Output is correct
29 Correct 148 ms 8876 KB Output is correct
30 Correct 127 ms 9156 KB Output is correct
31 Correct 120 ms 9340 KB Output is correct
32 Correct 113 ms 8304 KB Output is correct
33 Correct 123 ms 8760 KB Output is correct
34 Correct 2 ms 2636 KB Output is correct
35 Correct 2 ms 2636 KB Output is correct
36 Correct 2 ms 2636 KB Output is correct
37 Correct 2 ms 2640 KB Output is correct
38 Correct 2 ms 2636 KB Output is correct
39 Correct 2 ms 2652 KB Output is correct
40 Correct 2 ms 2636 KB Output is correct
41 Correct 2 ms 2636 KB Output is correct
42 Correct 2 ms 2636 KB Output is correct
43 Correct 2 ms 2652 KB Output is correct
44 Correct 2 ms 2636 KB Output is correct
45 Correct 129 ms 14928 KB Output is correct
46 Correct 119 ms 14696 KB Output is correct
47 Correct 123 ms 14916 KB Output is correct
48 Correct 103 ms 8004 KB Output is correct
49 Correct 120 ms 8580 KB Output is correct
50 Correct 120 ms 8760 KB Output is correct
51 Correct 3 ms 2636 KB Output is correct
52 Correct 40 ms 4788 KB Output is correct
53 Correct 118 ms 8652 KB Output is correct
54 Correct 124 ms 8816 KB Output is correct
55 Correct 122 ms 9156 KB Output is correct
56 Correct 133 ms 9288 KB Output is correct
57 Correct 106 ms 8264 KB Output is correct
58 Correct 115 ms 8760 KB Output is correct
59 Correct 36 ms 4584 KB Output is correct
60 Correct 107 ms 8120 KB Output is correct
61 Correct 120 ms 8632 KB Output is correct
62 Correct 120 ms 8892 KB Output is correct
63 Correct 120 ms 8816 KB Output is correct
64 Correct 128 ms 8784 KB Output is correct
65 Correct 110 ms 9228 KB Output is correct
66 Correct 114 ms 9352 KB Output is correct
67 Correct 125 ms 9236 KB Output is correct
68 Correct 116 ms 9176 KB Output is correct
69 Correct 120 ms 9184 KB Output is correct
70 Correct 101 ms 9172 KB Output is correct