# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
411439 | 2021-05-25T10:45:02 Z | 반딧불(#7604) | The Xana coup (BOI21_xanadu) | C++17 | 100 ms | 22860 KB |
#include <bits/stdc++.h> using namespace std; typedef long long ll; int n; bool arr[100002]; vector<int> link[100002]; ll DP[100002][2][2]; /// DP[i][j][k]: i�� ����Ʈ��. j: i�� ����� ���� ����. k: i�� ����°�? void dfs(int x, int par = -1){ if(par != -1) link[x].erase(find(link[x].begin(), link[x].end(), par)); if((int)link[x].size() == 0){ bool tmp = arr[x]; DP[x][tmp][0] = 0; DP[x][!tmp][1] = 1; DP[x][!tmp][0] = DP[x][tmp][1] = 1e9; return; } for(auto y: link[x]){ dfs(y, x); } DP[x][0][0] = DP[x][0][1] = DP[x][1][0] = DP[x][1][1] = 1e9; bool tmp = arr[x]; /// DP[i][tmp][0] ������ ��: DP[y][0][0] �� ���� DP[y][0][1] ¦�� ���� ������ �ȴ�. DP[i][tmp^1][0]�� ��� DP[y][0][1]�� Ȧ�� ���� �ȴ�. ll sum = 0; vector<ll> vec; for(auto y: link[x]){ sum += DP[y][0][0]; vec.push_back(DP[y][0][1] - DP[y][0][0]); } sort(vec.begin(), vec.end()); DP[x][tmp][0] = min(DP[x][tmp][0], sum); for(int d=0; d<(int)vec.size(); d++){ sum += vec[d]; DP[x][tmp ^ (d%2 ? 0 : 1)][0] = min(DP[x][tmp ^ (d%2 ? 0 : 1)][0], sum); } /// DP[i][tmp][1] ������ ��: ���� ���� �ٸ� sum = 1; vec.clear(); for(auto y: link[x]){ sum += DP[y][1][0]; vec.push_back(DP[y][1][1] - DP[y][1][0]); } sort(vec.begin(), vec.end()); DP[x][!tmp][1] = min(DP[x][!tmp][1], sum); for(int d=0; d<(int)vec.size(); d++){ sum += vec[d]; DP[x][tmp ^ (d%2)][1] = min(DP[x][tmp ^ (d%2)][1], sum); } // printf("%d: %lld %lld / %lld %lld\n", x, DP[x][0][0], DP[x][0][1], DP[x][1][0], DP[x][1][1]); } int main(){ scanf("%d", &n); for(int i=1; i<n; i++){ int x, y; scanf("%d %d", &x, &y); link[x].push_back(y); link[y].push_back(x); } for(int i=1; i<=n; i++) scanf("%d", &arr[i]); dfs(1); ll ans = min(DP[1][0][0], DP[1][0][1]); if(ans > n) printf("impossible"); else printf("%d", ans); }
Compilation message
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 2 ms | 2640 KB | Output is correct |
2 | Correct | 2 ms | 2636 KB | Output is correct |
3 | Correct | 3 ms | 2636 KB | Output is correct |
4 | Correct | 2 ms | 2636 KB | Output is correct |
5 | Correct | 2 ms | 2636 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 2 ms | 2640 KB | Output is correct |
2 | Correct | 2 ms | 2636 KB | Output is correct |
3 | Correct | 3 ms | 2636 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 | 2 ms | 2636 KB | Output is correct |
8 | Correct | 2 ms | 2636 KB | Output is correct |
9 | Correct | 2 ms | 2656 KB | Output is correct |
10 | Correct | 3 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 | 2 ms | 2636 KB | Output is correct |
14 | Correct | 3 ms | 2636 KB | Output is correct |
15 | Correct | 2 ms | 2636 KB | Output is correct |
16 | Correct | 3 ms | 2636 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 91 ms | 22768 KB | Output is correct |
2 | Correct | 78 ms | 22412 KB | Output is correct |
3 | Correct | 80 ms | 22852 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 86 ms | 22688 KB | Output is correct |
2 | Correct | 77 ms | 22416 KB | Output is correct |
3 | Correct | 83 ms | 22788 KB | Output is correct |
4 | Correct | 70 ms | 9424 KB | Output is correct |
5 | Correct | 81 ms | 10280 KB | Output is correct |
6 | Correct | 93 ms | 10328 KB | Output is correct |
7 | Correct | 2 ms | 2636 KB | Output is correct |
8 | Correct | 23 ms | 5152 KB | Output is correct |
9 | Correct | 80 ms | 10308 KB | Output is correct |
10 | Correct | 82 ms | 10436 KB | Output is correct |
11 | Correct | 87 ms | 11204 KB | Output is correct |
12 | Correct | 86 ms | 11544 KB | Output is correct |
13 | Correct | 65 ms | 9796 KB | Output is correct |
14 | Correct | 83 ms | 10276 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 2 ms | 2640 KB | Output is correct |
2 | Correct | 2 ms | 2636 KB | Output is correct |
3 | Correct | 3 ms | 2636 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 | 2 ms | 2636 KB | Output is correct |
8 | Correct | 2 ms | 2636 KB | Output is correct |
9 | Correct | 2 ms | 2656 KB | Output is correct |
10 | Correct | 3 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 | 2 ms | 2636 KB | Output is correct |
14 | Correct | 3 ms | 2636 KB | Output is correct |
15 | Correct | 2 ms | 2636 KB | Output is correct |
16 | Correct | 3 ms | 2636 KB | Output is correct |
17 | Correct | 91 ms | 22768 KB | Output is correct |
18 | Correct | 78 ms | 22412 KB | Output is correct |
19 | Correct | 80 ms | 22852 KB | Output is correct |
20 | Correct | 86 ms | 22688 KB | Output is correct |
21 | Correct | 77 ms | 22416 KB | Output is correct |
22 | Correct | 83 ms | 22788 KB | Output is correct |
23 | Correct | 70 ms | 9424 KB | Output is correct |
24 | Correct | 81 ms | 10280 KB | Output is correct |
25 | Correct | 93 ms | 10328 KB | Output is correct |
26 | Correct | 2 ms | 2636 KB | Output is correct |
27 | Correct | 23 ms | 5152 KB | Output is correct |
28 | Correct | 80 ms | 10308 KB | Output is correct |
29 | Correct | 82 ms | 10436 KB | Output is correct |
30 | Correct | 87 ms | 11204 KB | Output is correct |
31 | Correct | 86 ms | 11544 KB | Output is correct |
32 | Correct | 65 ms | 9796 KB | Output is correct |
33 | Correct | 83 ms | 10276 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 | 2588 KB | Output is correct |
38 | Correct | 2 ms | 2636 KB | Output is correct |
39 | Correct | 2 ms | 2636 KB | Output is correct |
40 | Correct | 2 ms | 2652 KB | Output is correct |
41 | Correct | 3 ms | 2636 KB | Output is correct |
42 | Correct | 2 ms | 2636 KB | Output is correct |
43 | Correct | 2 ms | 2656 KB | Output is correct |
44 | Correct | 2 ms | 2636 KB | Output is correct |
45 | Correct | 80 ms | 22700 KB | Output is correct |
46 | Correct | 75 ms | 22488 KB | Output is correct |
47 | Correct | 81 ms | 22860 KB | Output is correct |
48 | Correct | 65 ms | 9524 KB | Output is correct |
49 | Correct | 73 ms | 10180 KB | Output is correct |
50 | Correct | 85 ms | 10388 KB | Output is correct |
51 | Correct | 3 ms | 2696 KB | Output is correct |
52 | Correct | 23 ms | 5288 KB | Output is correct |
53 | Correct | 84 ms | 10208 KB | Output is correct |
54 | Correct | 76 ms | 10436 KB | Output is correct |
55 | Correct | 74 ms | 11188 KB | Output is correct |
56 | Correct | 88 ms | 11440 KB | Output is correct |
57 | Correct | 70 ms | 9808 KB | Output is correct |
58 | Correct | 82 ms | 10336 KB | Output is correct |
59 | Correct | 24 ms | 5168 KB | Output is correct |
60 | Correct | 83 ms | 9560 KB | Output is correct |
61 | Correct | 80 ms | 10180 KB | Output is correct |
62 | Correct | 100 ms | 10388 KB | Output is correct |
63 | Correct | 86 ms | 10476 KB | Output is correct |
64 | Correct | 79 ms | 10388 KB | Output is correct |
65 | Correct | 64 ms | 10808 KB | Output is correct |
66 | Correct | 63 ms | 10868 KB | Output is correct |
67 | Correct | 62 ms | 11892 KB | Output is correct |
68 | Correct | 60 ms | 11908 KB | Output is correct |
69 | Correct | 60 ms | 11828 KB | Output is correct |
70 | Correct | 61 ms | 11908 KB | Output is correct |