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Submission #484881

# Submission time Handle Problem Language Result Execution time Memory
484881 2021-11-05T16:56:02 Z wmch13 The Xana coup (BOI21_xanadu) C++14
100 / 100
 117 ms 20464 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 9;
const int INF = (int) 1e5 + 1;

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

int calcDP (int v, int flag1, int flag2, int p) {
	if (dp[v][flag1][flag2] != -1)
		return dp[v][flag1][flag2];
		
	int curState = (state[v] + flag1 + flag2) % 2;
	int minEven = 0, minOdd = INF;
	for (auto u: adj[v]) {
		if (u == p)
			continue;
		
		int r1 = calcDP (u, flag2, 0, v);
		int r2 = calcDP (u, flag2, 1, v);
		
		int copyMinEven = minEven;
		minEven = min (minEven + r1, minOdd + r2);
		minOdd  = min (minOdd + r1, copyMinEven + r2);
	}
	
	int res = flag2;
	res += (curState) ? minOdd : minEven;
	return dp[v][flag1][flag2] = res;
}

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

	for (int i = 1; i < n; i++) {
		int u, v;
		cin >> u >> v;
		
		adj[u].push_back (v);
		adj[v].push_back (u);
	}
	
	for (int i = 1; i <= n; i++)
		cin >> state[i];
	
	memset (dp, -1, sizeof (dp));
	int ans = min (calcDP (1, 0, 0, -1), calcDP (1, 0, 1, -1));
	
	if (ans > n) {
		puts ("impossible");
		return 0;
	}
	
	cout << ans << "\n";
	return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4192 KB Output is correct
2 Correct 2 ms 4172 KB Output is correct
3 Correct 2 ms 4172 KB Output is correct
4 Correct 2 ms 4172 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4192 KB Output is correct
2 Correct 2 ms 4172 KB Output is correct
3 Correct 2 ms 4172 KB Output is correct
4 Correct 2 ms 4172 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct
6 Correct 2 ms 4172 KB Output is correct
7 Correct 2 ms 4196 KB Output is correct
8 Correct 2 ms 4172 KB Output is correct
9 Correct 2 ms 4172 KB Output is correct
10 Correct 2 ms 4172 KB Output is correct
11 Correct 2 ms 4172 KB Output is correct
12 Correct 2 ms 4172 KB Output is correct
13 Correct 2 ms 4172 KB Output is correct
14 Correct 2 ms 4172 KB Output is correct
15 Correct 2 ms 4172 KB Output is correct
16 Correct 2 ms 4172 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 98 ms 20144 KB Output is correct
2 Correct 112 ms 19848 KB Output is correct
3 Correct 97 ms 20208 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 94 ms 20256 KB Output is correct
2 Correct 93 ms 19856 KB Output is correct
3 Correct 103 ms 20112 KB Output is correct
4 Correct 89 ms 7344 KB Output is correct
5 Correct 94 ms 7544 KB Output is correct
6 Correct 104 ms 7860 KB Output is correct
7 Correct 2 ms 4172 KB Output is correct
8 Correct 29 ms 5700 KB Output is correct
9 Correct 97 ms 8004 KB Output is correct
10 Correct 94 ms 8052 KB Output is correct
11 Correct 93 ms 8836 KB Output is correct
12 Correct 103 ms 9064 KB Output is correct
13 Correct 97 ms 7712 KB Output is correct
14 Correct 102 ms 7896 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4192 KB Output is correct
2 Correct 2 ms 4172 KB Output is correct
3 Correct 2 ms 4172 KB Output is correct
4 Correct 2 ms 4172 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct
6 Correct 2 ms 4172 KB Output is correct
7 Correct 2 ms 4196 KB Output is correct
8 Correct 2 ms 4172 KB Output is correct
9 Correct 2 ms 4172 KB Output is correct
10 Correct 2 ms 4172 KB Output is correct
11 Correct 2 ms 4172 KB Output is correct
12 Correct 2 ms 4172 KB Output is correct
13 Correct 2 ms 4172 KB Output is correct
14 Correct 2 ms 4172 KB Output is correct
15 Correct 2 ms 4172 KB Output is correct
16 Correct 2 ms 4172 KB Output is correct
17 Correct 98 ms 20144 KB Output is correct
18 Correct 112 ms 19848 KB Output is correct
19 Correct 97 ms 20208 KB Output is correct
20 Correct 94 ms 20256 KB Output is correct
21 Correct 93 ms 19856 KB Output is correct
22 Correct 103 ms 20112 KB Output is correct
23 Correct 89 ms 7344 KB Output is correct
24 Correct 94 ms 7544 KB Output is correct
25 Correct 104 ms 7860 KB Output is correct
26 Correct 2 ms 4172 KB Output is correct
27 Correct 29 ms 5700 KB Output is correct
28 Correct 97 ms 8004 KB Output is correct
29 Correct 94 ms 8052 KB Output is correct
30 Correct 93 ms 8836 KB Output is correct
31 Correct 103 ms 9064 KB Output is correct
32 Correct 97 ms 7712 KB Output is correct
33 Correct 102 ms 7896 KB Output is correct
34 Correct 2 ms 4172 KB Output is correct
35 Correct 2 ms 4172 KB Output is correct
36 Correct 2 ms 4172 KB Output is correct
37 Correct 3 ms 4172 KB Output is correct
38 Correct 2 ms 4172 KB Output is correct
39 Correct 2 ms 4188 KB Output is correct
40 Correct 2 ms 4172 KB Output is correct
41 Correct 2 ms 4172 KB Output is correct
42 Correct 2 ms 4188 KB Output is correct
43 Correct 2 ms 4184 KB Output is correct
44 Correct 2 ms 4172 KB Output is correct
45 Correct 117 ms 20332 KB Output is correct
46 Correct 98 ms 20156 KB Output is correct
47 Correct 94 ms 20464 KB Output is correct
48 Correct 83 ms 7572 KB Output is correct
49 Correct 93 ms 7908 KB Output is correct
50 Correct 103 ms 7932 KB Output is correct
51 Correct 2 ms 4200 KB Output is correct
52 Correct 31 ms 5700 KB Output is correct
53 Correct 91 ms 8004 KB Output is correct
54 Correct 94 ms 8116 KB Output is correct
55 Correct 93 ms 8900 KB Output is correct
56 Correct 96 ms 9140 KB Output is correct
57 Correct 88 ms 7732 KB Output is correct
58 Correct 94 ms 7888 KB Output is correct
59 Correct 30 ms 5644 KB Output is correct
60 Correct 85 ms 7616 KB Output is correct
61 Correct 90 ms 7896 KB Output is correct
62 Correct 97 ms 8132 KB Output is correct
63 Correct 101 ms 8124 KB Output is correct
64 Correct 103 ms 8016 KB Output is correct
65 Correct 91 ms 8404 KB Output is correct
66 Correct 87 ms 8516 KB Output is correct
67 Correct 80 ms 8264 KB Output is correct
68 Correct 86 ms 8376 KB Output is correct
69 Correct 80 ms 8252 KB Output is correct
70 Correct 82 ms 8380 KB Output is correct