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Submission #427992

# Submission time Handle Problem Language Result Execution time Memory
427992 2021-06-15T06:53:25 Z patrikpavic2 The Xana coup (BOI21_xanadu) C++17
100 / 100
 131 ms 21588 KB 
#include <cstdio>
#include <cstring>
#include <vector>

#define PB push_back

using namespace std;

const int N = 1e5 + 500;
const int INF = 0x3f3f3f3f;

int n;
int dp[N][2][2], poc[N];
vector < int > v[N];

int f(int x, int lst, int ja, int par){
	if(dp[x][ja][par] != -1) return dp[x][ja][par];
	int cur0 = 0, cur1 = N;
	for(int y : v[x]){
		if(y == lst) continue;
		int pr0 = f(y, x, 0, ja);
		int pr1 = f(y, x, 1, ja);
		int nxt0 = min(cur0 + pr0, cur1 + pr1);
		int nxt1 = min(cur0 + pr1, cur1 + pr0);
		cur0 = nxt0, cur1 = nxt1;
	}
	return dp[x][ja][par] = ja + ((poc[x] ^ ja ^ par) ? cur1 : cur0);
}

int main(){
	memset(dp, -1, sizeof(dp));
	scanf("%d", &n);
	for(int i = 1;i < n;i++){
		int x, y; scanf("%d%d", &x, &y);
		v[x].PB(y), v[y].PB(x);
	}
	for(int i = 1;i <= n;i++)
		scanf("%d", poc + i);
	int sol = min(f(1, 1, 0, 0), f(1, 1, 1, 0));
	if(sol < N)	
		printf("%d\n", sol);
	else
		printf("impossible\n");
	return 0;
}

Compilation message

xanadu.cpp: In function 'int main()':
xanadu.cpp:32:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
xanadu.cpp:34:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |   int x, y; scanf("%d%d", &x, &y);
      |             ~~~~~^~~~~~~~~~~~~~~~
xanadu.cpp:38:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |   scanf("%d", poc + i);
      |   ~~~~~^~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4172 KB Output is correct
2 Correct 3 ms 4172 KB Output is correct
3 Correct 3 ms 4172 KB Output is correct
4 Correct 3 ms 4224 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 3 ms 4172 KB Output is correct
2 Correct 3 ms 4172 KB Output is correct
3 Correct 3 ms 4172 KB Output is correct
4 Correct 3 ms 4224 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct
6 Correct 3 ms 4172 KB Output is correct
7 Correct 3 ms 4184 KB Output is correct
8 Correct 3 ms 4172 KB Output is correct
9 Correct 3 ms 4140 KB Output is correct
10 Correct 3 ms 4220 KB Output is correct
11 Correct 3 ms 4172 KB Output is correct
12 Correct 3 ms 4220 KB Output is correct
13 Correct 3 ms 4224 KB Output is correct
14 Correct 3 ms 4220 KB Output is correct
15 Correct 3 ms 4172 KB Output is correct
16 Correct 3 ms 4172 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 131 ms 21416 KB Output is correct
2 Correct 104 ms 21288 KB Output is correct
3 Correct 83 ms 21480 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 83 ms 21500 KB Output is correct
2 Correct 102 ms 21204 KB Output is correct
3 Correct 114 ms 21588 KB Output is correct
4 Correct 80 ms 8664 KB Output is correct
5 Correct 93 ms 9172 KB Output is correct
6 Correct 92 ms 9024 KB Output is correct
7 Correct 4 ms 4172 KB Output is correct
8 Correct 36 ms 5880 KB Output is correct
9 Correct 111 ms 9036 KB Output is correct
10 Correct 82 ms 9216 KB Output is correct
11 Correct 91 ms 10056 KB Output is correct
12 Correct 99 ms 10180 KB Output is correct
13 Correct 93 ms 8752 KB Output is correct
14 Correct 129 ms 9048 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4172 KB Output is correct
2 Correct 3 ms 4172 KB Output is correct
3 Correct 3 ms 4172 KB Output is correct
4 Correct 3 ms 4224 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct
6 Correct 3 ms 4172 KB Output is correct
7 Correct 3 ms 4184 KB Output is correct
8 Correct 3 ms 4172 KB Output is correct
9 Correct 3 ms 4140 KB Output is correct
10 Correct 3 ms 4220 KB Output is correct
11 Correct 3 ms 4172 KB Output is correct
12 Correct 3 ms 4220 KB Output is correct
13 Correct 3 ms 4224 KB Output is correct
14 Correct 3 ms 4220 KB Output is correct
15 Correct 3 ms 4172 KB Output is correct
16 Correct 3 ms 4172 KB Output is correct
17 Correct 131 ms 21416 KB Output is correct
18 Correct 104 ms 21288 KB Output is correct
19 Correct 83 ms 21480 KB Output is correct
20 Correct 83 ms 21500 KB Output is correct
21 Correct 102 ms 21204 KB Output is correct
22 Correct 114 ms 21588 KB Output is correct
23 Correct 80 ms 8664 KB Output is correct
24 Correct 93 ms 9172 KB Output is correct
25 Correct 92 ms 9024 KB Output is correct
26 Correct 4 ms 4172 KB Output is correct
27 Correct 36 ms 5880 KB Output is correct
28 Correct 111 ms 9036 KB Output is correct
29 Correct 82 ms 9216 KB Output is correct
30 Correct 91 ms 10056 KB Output is correct
31 Correct 99 ms 10180 KB Output is correct
32 Correct 93 ms 8752 KB Output is correct
33 Correct 129 ms 9048 KB Output is correct
34 Correct 2 ms 4172 KB Output is correct
35 Correct 3 ms 4172 KB Output is correct
36 Correct 3 ms 4172 KB Output is correct
37 Correct 3 ms 4172 KB Output is correct
38 Correct 3 ms 4172 KB Output is correct
39 Correct 3 ms 4220 KB Output is correct
40 Correct 3 ms 4172 KB Output is correct
41 Correct 3 ms 4168 KB Output is correct
42 Correct 3 ms 4224 KB Output is correct
43 Correct 3 ms 4224 KB Output is correct
44 Correct 3 ms 4172 KB Output is correct
45 Correct 111 ms 21500 KB Output is correct
46 Correct 122 ms 21300 KB Output is correct
47 Correct 79 ms 21572 KB Output is correct
48 Correct 76 ms 8468 KB Output is correct
49 Correct 89 ms 8904 KB Output is correct
50 Correct 124 ms 9064 KB Output is correct
51 Correct 4 ms 4172 KB Output is correct
52 Correct 30 ms 5836 KB Output is correct
53 Correct 87 ms 9104 KB Output is correct
54 Correct 77 ms 9284 KB Output is correct
55 Correct 95 ms 9892 KB Output is correct
56 Correct 92 ms 10208 KB Output is correct
57 Correct 85 ms 8796 KB Output is correct
58 Correct 104 ms 8984 KB Output is correct
59 Correct 23 ms 5772 KB Output is correct
60 Correct 67 ms 8528 KB Output is correct
61 Correct 105 ms 9076 KB Output is correct
62 Correct 106 ms 9092 KB Output is correct
63 Correct 111 ms 9156 KB Output is correct
64 Correct 77 ms 9140 KB Output is correct
65 Correct 82 ms 9528 KB Output is correct
66 Correct 98 ms 9504 KB Output is correct
67 Correct 72 ms 9404 KB Output is correct
68 Correct 86 ms 9484 KB Output is correct
69 Correct 71 ms 9404 KB Output is correct
70 Correct 71 ms 9424 KB Output is correct