oj.uz

Submission #894256

# Submission time Handle Problem Language Result Execution time Memory
894256 2023-12-28T03:08:15 Z box The Xana coup (BOI21_xanadu) C++17
100 / 100
 69 ms 20092 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define ar array
#define sz(v) static_cast<int>(v.size())
#define all(v) (v).begin(), (v).end()
typedef pair<int, int> pi;
typedef long long ll;
typedef vector<int> vi;
 
const int N = 1e5, INF = 1e9;
 
int n, a[N];
ar<int, 2> dp[N][2];
vi g[N];
 
ar<int, 2> operator+(const ar<int, 2> &u, const ar<int, 2> &v) {
  return {min({INF, u[0] + v[0], u[1] + v[1]}),
          min({INF, u[0] + v[1], u[1] + v[0]})};
}
 
void dfs(int p, int i) {
  ar<int, 2> op0{0, INF}, op1{INF, 1};
  for (int j : g[i])
    if (p ^ j) {
      dfs(i, j);
      op0 = op0 + dp[j][0];
      op1 = op1 + dp[j][1];
    }
  if (a[i]) {
    swap(op0[0], op0[1]);
    swap(op1[0], op1[1]);
  }
  dp[i][0][0] = op0[0];
  dp[i][1][0] = op0[1];
  dp[i][0][1] = op1[0];
  dp[i][1][1] = op1[1];
}
 
int main() {
  cin.tie(0)->sync_with_stdio(0);
  cin >> n;
  for (int h = 0; h < n - 1; h++) {
    int i, j;
    cin >> i >> j, i--, j--;
    g[i].push_back(j), g[j].push_back(i);
  }
  for (int i = 0; i < n; i++) cin >> a[i];
  dfs(-1, 0);
  int x = min(dp[0][0][0], dp[0][0][1]);
  if (x == INF)
    cout << "impossible\n";
  else
    cout << x << '\n';
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4744 KB Output is correct
2 Correct 1 ms 4700 KB Output is correct
3 Correct 1 ms 4748 KB Output is correct
4 Correct 1 ms 4700 KB Output is correct
5 Correct 1 ms 4700 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4744 KB Output is correct
2 Correct 1 ms 4700 KB Output is correct
3 Correct 1 ms 4748 KB Output is correct
4 Correct 1 ms 4700 KB Output is correct
5 Correct 1 ms 4700 KB Output is correct
6 Correct 1 ms 4700 KB Output is correct
7 Correct 1 ms 4700 KB Output is correct
8 Correct 1 ms 4700 KB Output is correct
9 Correct 1 ms 4700 KB Output is correct
10 Correct 1 ms 4700 KB Output is correct
11 Correct 1 ms 4700 KB Output is correct
12 Correct 1 ms 4700 KB Output is correct
13 Correct 1 ms 4700 KB Output is correct
14 Correct 1 ms 4696 KB Output is correct
15 Correct 1 ms 4752 KB Output is correct
16 Correct 1 ms 4700 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 19892 KB Output is correct
2 Correct 44 ms 19792 KB Output is correct
3 Correct 51 ms 20032 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 58 ms 19864 KB Output is correct
2 Correct 49 ms 19876 KB Output is correct
3 Correct 50 ms 19960 KB Output is correct
4 Correct 56 ms 8508 KB Output is correct
5 Correct 53 ms 9048 KB Output is correct
6 Correct 41 ms 9224 KB Output is correct
7 Correct 1 ms 4760 KB Output is correct
8 Correct 14 ms 6236 KB Output is correct
9 Correct 69 ms 9036 KB Output is correct
10 Correct 61 ms 9308 KB Output is correct
11 Correct 62 ms 9800 KB Output is correct
12 Correct 45 ms 10228 KB Output is correct
13 Correct 45 ms 8920 KB Output is correct
14 Correct 36 ms 9112 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4744 KB Output is correct
2 Correct 1 ms 4700 KB Output is correct
3 Correct 1 ms 4748 KB Output is correct
4 Correct 1 ms 4700 KB Output is correct
5 Correct 1 ms 4700 KB Output is correct
6 Correct 1 ms 4700 KB Output is correct
7 Correct 1 ms 4700 KB Output is correct
8 Correct 1 ms 4700 KB Output is correct
9 Correct 1 ms 4700 KB Output is correct
10 Correct 1 ms 4700 KB Output is correct
11 Correct 1 ms 4700 KB Output is correct
12 Correct 1 ms 4700 KB Output is correct
13 Correct 1 ms 4700 KB Output is correct
14 Correct 1 ms 4696 KB Output is correct
15 Correct 1 ms 4752 KB Output is correct
16 Correct 1 ms 4700 KB Output is correct
17 Correct 52 ms 19892 KB Output is correct
18 Correct 44 ms 19792 KB Output is correct
19 Correct 51 ms 20032 KB Output is correct
20 Correct 58 ms 19864 KB Output is correct
21 Correct 49 ms 19876 KB Output is correct
22 Correct 50 ms 19960 KB Output is correct
23 Correct 56 ms 8508 KB Output is correct
24 Correct 53 ms 9048 KB Output is correct
25 Correct 41 ms 9224 KB Output is correct
26 Correct 1 ms 4760 KB Output is correct
27 Correct 14 ms 6236 KB Output is correct
28 Correct 69 ms 9036 KB Output is correct
29 Correct 61 ms 9308 KB Output is correct
30 Correct 62 ms 9800 KB Output is correct
31 Correct 45 ms 10228 KB Output is correct
32 Correct 45 ms 8920 KB Output is correct
33 Correct 36 ms 9112 KB Output is correct
34 Correct 1 ms 4700 KB Output is correct
35 Correct 1 ms 4700 KB Output is correct
36 Correct 1 ms 4744 KB Output is correct
37 Correct 2 ms 4700 KB Output is correct
38 Correct 1 ms 4700 KB Output is correct
39 Correct 1 ms 4700 KB Output is correct
40 Correct 1 ms 4696 KB Output is correct
41 Correct 1 ms 4700 KB Output is correct
42 Correct 1 ms 4712 KB Output is correct
43 Correct 1 ms 4700 KB Output is correct
44 Correct 2 ms 4696 KB Output is correct
45 Correct 52 ms 20092 KB Output is correct
46 Correct 46 ms 19796 KB Output is correct
47 Correct 46 ms 20056 KB Output is correct
48 Correct 60 ms 8532 KB Output is correct
49 Correct 37 ms 9040 KB Output is correct
50 Correct 56 ms 9040 KB Output is correct
51 Correct 2 ms 4696 KB Output is correct
52 Correct 11 ms 6236 KB Output is correct
53 Correct 62 ms 9052 KB Output is correct
54 Correct 40 ms 9300 KB Output is correct
55 Correct 51 ms 9820 KB Output is correct
56 Correct 47 ms 10064 KB Output is correct
57 Correct 36 ms 8924 KB Output is correct
58 Correct 46 ms 9032 KB Output is correct
59 Correct 13 ms 6232 KB Output is correct
60 Correct 54 ms 8776 KB Output is correct
61 Correct 41 ms 9176 KB Output is correct
62 Correct 42 ms 9308 KB Output is correct
63 Correct 56 ms 9336 KB Output is correct
64 Correct 46 ms 9260 KB Output is correct
65 Correct 30 ms 9728 KB Output is correct
66 Correct 29 ms 9700 KB Output is correct
67 Correct 40 ms 9412 KB Output is correct
68 Correct 52 ms 9428 KB Output is correct
69 Correct 48 ms 9416 KB Output is correct
70 Correct 44 ms 9592 KB Output is correct