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Submission #797358

# Submission time Handle Problem Language Result Execution time Memory
797358 2023-07-29T09:54:51 Z tch1cherin The Xana coup (BOI21_xanadu) C++17
100 / 100
 65 ms 18428 KB 
#include <bits/stdc++.h>
using namespace std;
 
const int N = 100000;
vector<int> g[N];
int dp[N][2][2], a[N];
 
void DFS(int u = 0, int p = -1) {
  for (int v : g[u]) {
    if (v != p) {
      DFS(v, u);
    }
  }
  for (int par = 0; par < 2; par++) {
    for (int cur = 0; cur < 2; cur++) {
      int ans[2] = {N + 1, N + 1};
      ans[par ^ cur] = cur;
      for (int v : g[u]) {
        if (v == p) {
          continue;
        }
        int new_ans[2] = {N + 1, N + 1};
        for (int c = 0; c < 2; c++) {
          for (int d = 0; d < 2; d++) {
            new_ans[d ^ c] = min(new_ans[d ^ c], ans[d] + dp[v][cur][c]);   
          }
        }
        ans[0] = new_ans[0];
        ans[1] = new_ans[1];
      }
      dp[u][par][cur] = ans[a[u]]; 
    }
  } 
}
 
void solve() {
  int n;
  cin >> n;
  for (int i = 0; i < n - 1; i++) {
    int u, v;
    cin >> u >> v;
    u--, v--;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  DFS();
  int ans = min(dp[0][0][0], dp[0][0][1]);
  if (ans == N + 1) {
    cout << "impossible\n";
  } else {
    cout << ans << "\n";
  }
}
 
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  solve();
}

Subtask #1
5.0 / 5.0

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

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 1 ms 2676 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 1 ms 2644 KB Output is correct
6 Correct 1 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 1 ms 2644 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 1 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 2684 KB Output is correct
15 Correct 1 ms 2596 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 18356 KB Output is correct
2 Correct 42 ms 18172 KB Output is correct
3 Correct 65 ms 18428 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 18352 KB Output is correct
2 Correct 45 ms 18184 KB Output is correct
3 Correct 39 ms 18412 KB Output is correct
4 Correct 29 ms 8396 KB Output is correct
5 Correct 32 ms 8880 KB Output is correct
6 Correct 37 ms 9036 KB Output is correct
7 Correct 1 ms 2644 KB Output is correct
8 Correct 11 ms 4784 KB Output is correct
9 Correct 33 ms 9012 KB Output is correct
10 Correct 33 ms 9172 KB Output is correct
11 Correct 50 ms 9716 KB Output is correct
12 Correct 49 ms 9940 KB Output is correct
13 Correct 36 ms 8680 KB Output is correct
14 Correct 45 ms 9084 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 1 ms 2676 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 1 ms 2644 KB Output is correct
6 Correct 1 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 1 ms 2644 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 1 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 2684 KB Output is correct
15 Correct 1 ms 2596 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 43 ms 18356 KB Output is correct
18 Correct 42 ms 18172 KB Output is correct
19 Correct 65 ms 18428 KB Output is correct
20 Correct 34 ms 18352 KB Output is correct
21 Correct 45 ms 18184 KB Output is correct
22 Correct 39 ms 18412 KB Output is correct
23 Correct 29 ms 8396 KB Output is correct
24 Correct 32 ms 8880 KB Output is correct
25 Correct 37 ms 9036 KB Output is correct
26 Correct 1 ms 2644 KB Output is correct
27 Correct 11 ms 4784 KB Output is correct
28 Correct 33 ms 9012 KB Output is correct
29 Correct 33 ms 9172 KB Output is correct
30 Correct 50 ms 9716 KB Output is correct
31 Correct 49 ms 9940 KB Output is correct
32 Correct 36 ms 8680 KB Output is correct
33 Correct 45 ms 9084 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 2 ms 2684 KB Output is correct
36 Correct 2 ms 2644 KB Output is correct
37 Correct 2 ms 2644 KB Output is correct
38 Correct 1 ms 2644 KB Output is correct
39 Correct 2 ms 2644 KB Output is correct
40 Correct 1 ms 2644 KB Output is correct
41 Correct 2 ms 2676 KB Output is correct
42 Correct 2 ms 2644 KB Output is correct
43 Correct 2 ms 2644 KB Output is correct
44 Correct 1 ms 2644 KB Output is correct
45 Correct 50 ms 18276 KB Output is correct
46 Correct 35 ms 18140 KB Output is correct
47 Correct 54 ms 18364 KB Output is correct
48 Correct 31 ms 8396 KB Output is correct
49 Correct 32 ms 8868 KB Output is correct
50 Correct 34 ms 9092 KB Output is correct
51 Correct 2 ms 2644 KB Output is correct
52 Correct 12 ms 4736 KB Output is correct
53 Correct 33 ms 9052 KB Output is correct
54 Correct 50 ms 9136 KB Output is correct
55 Correct 35 ms 9604 KB Output is correct
56 Correct 45 ms 9860 KB Output is correct
57 Correct 37 ms 8652 KB Output is correct
58 Correct 33 ms 9088 KB Output is correct
59 Correct 11 ms 4752 KB Output is correct
60 Correct 30 ms 8416 KB Output is correct
61 Correct 33 ms 9012 KB Output is correct
62 Correct 34 ms 9164 KB Output is correct
63 Correct 34 ms 9088 KB Output is correct
64 Correct 33 ms 9084 KB Output is correct
65 Correct 30 ms 9584 KB Output is correct
66 Correct 31 ms 9548 KB Output is correct
67 Correct 28 ms 9412 KB Output is correct
68 Correct 28 ms 9432 KB Output is correct
69 Correct 28 ms 9404 KB Output is correct
70 Correct 28 ms 9496 KB Output is correct