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Submission #557965

# Submission time Handle Problem Language Result Execution time Memory
557965 2022-05-06T11:48:53 Z AdamGS The Xana coup (BOI21_xanadu) C++17
100 / 100
 75 ms 18424 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int LIM=1e5+7, INF=1e9+7;
vector<int>V[LIM];
int dp[LIM][2][2], T[LIM]; 
void DFS(int x, int o) {
	int dp2[2][2];
	dp2[0][0]=dp2[0][1]=0;
	dp2[1][0]=dp2[1][1]=INF;
	for(auto i : V[x]) if(i!=o) {
		DFS(i, x);
		int dp3[2][2];
		rep(a, 2) rep(b, 2) dp3[a][b]=INF;
		rep(a, 2) {
			dp3[0][a]=min(dp3[0][a], dp2[0][a]+dp[i][0][a]);
			dp3[0][a]=min(dp3[0][a], dp2[1][a]+dp[i][1][a]);
			dp3[1][a]=min(dp3[1][a], dp2[0][a]+dp[i][1][a]);
			dp3[1][a]=min(dp3[1][a], dp2[1][a]+dp[i][0][a]);
		}
		rep(a, 2) rep(b, 2) dp2[a][b]=dp3[a][b];
	}
	rep(i, 2) {
		dp[x][0][i]=min(dp2[i^T[x]][0], INF);
		dp[x][1][i]=min(dp2[i^T[x]^1][1]+1, INF);
	}
}
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n;
	cin >> n;
	rep(i, n-1) {
		int a, b;
		cin >> a >> b; --a; --b;
		V[a].pb(b);
		V[b].pb(a);
	}
	rep(i, n) cin >> T[i];
	DFS(0, 0);
	if(min(dp[0][0][0], dp[0][1][0])==INF) cout << "impossible\n";
	else cout << min(dp[0][0][0], dp[0][1][0]) << '\n';
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 1 ms 2676 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 1 ms 2676 KB Output is correct
6 Correct 2 ms 2676 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2680 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2676 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 18392 KB Output is correct
2 Correct 48 ms 18160 KB Output is correct
3 Correct 47 ms 18356 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 18424 KB Output is correct
2 Correct 59 ms 18212 KB Output is correct
3 Correct 70 ms 18380 KB Output is correct
4 Correct 54 ms 8372 KB Output is correct
5 Correct 52 ms 8956 KB Output is correct
6 Correct 48 ms 8968 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 15 ms 4820 KB Output is correct
9 Correct 58 ms 9116 KB Output is correct
10 Correct 70 ms 9204 KB Output is correct
11 Correct 71 ms 9612 KB Output is correct
12 Correct 52 ms 9932 KB Output is correct
13 Correct 44 ms 8588 KB Output is correct
14 Correct 48 ms 9064 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 1 ms 2676 KB Output is correct
6 Correct 2 ms 2676 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2680 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2676 KB Output is correct
17 Correct 75 ms 18392 KB Output is correct
18 Correct 48 ms 18160 KB Output is correct
19 Correct 47 ms 18356 KB Output is correct
20 Correct 53 ms 18424 KB Output is correct
21 Correct 59 ms 18212 KB Output is correct
22 Correct 70 ms 18380 KB Output is correct
23 Correct 54 ms 8372 KB Output is correct
24 Correct 52 ms 8956 KB Output is correct
25 Correct 48 ms 8968 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 15 ms 4820 KB Output is correct
28 Correct 58 ms 9116 KB Output is correct
29 Correct 70 ms 9204 KB Output is correct
30 Correct 71 ms 9612 KB Output is correct
31 Correct 52 ms 9932 KB Output is correct
32 Correct 44 ms 8588 KB Output is correct
33 Correct 48 ms 9064 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 2 ms 2644 KB Output is correct
36 Correct 2 ms 2644 KB Output is correct
37 Correct 2 ms 2644 KB Output is correct
38 Correct 2 ms 2644 KB Output is correct
39 Correct 2 ms 2592 KB Output is correct
40 Correct 1 ms 2680 KB Output is correct
41 Correct 2 ms 2644 KB Output is correct
42 Correct 2 ms 2672 KB Output is correct
43 Correct 2 ms 2644 KB Output is correct
44 Correct 2 ms 2644 KB Output is correct
45 Correct 54 ms 18396 KB Output is correct
46 Correct 51 ms 18172 KB Output is correct
47 Correct 60 ms 18388 KB Output is correct
48 Correct 69 ms 8400 KB Output is correct
49 Correct 49 ms 8840 KB Output is correct
50 Correct 52 ms 9072 KB Output is correct
51 Correct 2 ms 2644 KB Output is correct
52 Correct 15 ms 4756 KB Output is correct
53 Correct 48 ms 8992 KB Output is correct
54 Correct 54 ms 9284 KB Output is correct
55 Correct 71 ms 9712 KB Output is correct
56 Correct 62 ms 9852 KB Output is correct
57 Correct 44 ms 8588 KB Output is correct
58 Correct 50 ms 9060 KB Output is correct
59 Correct 21 ms 4748 KB Output is correct
60 Correct 60 ms 8528 KB Output is correct
61 Correct 63 ms 8944 KB Output is correct
62 Correct 47 ms 9132 KB Output is correct
63 Correct 47 ms 9084 KB Output is correct
64 Correct 56 ms 9088 KB Output is correct
65 Correct 49 ms 9640 KB Output is correct
66 Correct 51 ms 9520 KB Output is correct
67 Correct 49 ms 9452 KB Output is correct
68 Correct 34 ms 9456 KB Output is correct
69 Correct 37 ms 9512 KB Output is correct
70 Correct 34 ms 9504 KB Output is correct